1. News

New in 7.1.3

We’ve overhauled the entire app to improve stability and performance, and added some new features.

Markers are now also visible in the archive
eSense Pulse with new evaluation and reference values by gender and age (as an in-app purchase)
Module names freely selectable for procedures
Extended backup of the archive locally & in the cloud (as an in-app purchase)
Increased precision in the timing of recordings, especially in CSV export

Manual & FAQ: https://help.mindfield.de

2. Delivery contents eSense Pulse

Scope of delivery of the eSense Pulse:

Mindfield® eSense Pulse Sensor incl. battery (lasts approx. 1 year) and spare battery
Electrode contact spray
eSense App from Mindfield (Apple App Store, Google Play or Amazon App Store)
Detailed instructions for effective biofeedback training

3. Technical Data

Bluetooth®

Bluetooth® Version:	4.0 Low Energy
Frequency range:	2402-2480 MHz
Data rate:	1 Mbps
Number of channels:	40
Channel spacing:	2 MHz
Antenna type:	Integrated antenna
Antenna gain:	0.5dBi

ANT+

Frequency range:	2457 MHz
Operating voltage:	3 Volt DC
Antenna type:	Integrated antenna
Antenna gain:	0.5dBi

eSense Pulse:

Sample frequency (internal): 500 Hz, RR intervals with 5 Hz to eSense App
Measuring range: 30-240 BPM +- 2 BPM
Internal error correction
Operating range: 5-40 °C, <= 95% relative humidity
Belt made of polyamide and conductive silicone + TPU for the electrical contacts

4. Comparison measurement eSense Pulse & Faros 180

It shows a high precision and agreement of the data collected in parallel on one person. The curves lie so exactly on top of each other that the curve underneath in blue is hardly recognizable:

5. Combination possibilities eSense sensors & Combined Feedback

The eSense sensors can be combined with each other with restrictions. You can use this combination in our eSense app in both an Open Training and a Procedure.

Since the eSense Skin Response, eSense Temperature and eSense Respiration each require the 3.5mm headphone jack in your smartphone or tablet, these 3 sensors cannot be combined with each other.

The video explains the exact procedure for combining the eSense. The settings in the eSense app are shown and how a later evaluation of the combined measurements can be made.

eSense Pulse

Since the eSense Pulse connects via Bluetooth®, you can combine the eSense Pulse with each of the other sensors (via the 3.5mm headphone jack).

This results in the following possible combinations regarding sensors and biofeedback parameters (in brackets):

eSense Pulse (pulse) + eSense Skin Response (skin conductance)
eSense Pulse (pulse) + eSense Temperature (temperature)
eSense Pulse (pulse) + eSense Respiration (respiration) (+ eSense Skin Response)*.

*The eSense Respiration can only be used in combination with the eSense Skin Response, as it is based on the Skin Response.

Combined measurement eSense Pulse & Skin Response

Combined measurement eSense Pulse & Temperature

Combined measurement eSense Pulse & Respiration

6. Analysis of eSense data (CSV)

You can export the data from the eSense app and then further evaluate it with other programs (such as Microsoft Excel™ or Google Spreadsheets™). In this guide we will show you all the steps, from exporting from the eSense app to importing and evaluating in Microsoft Excel™ and Google Sheets™.

For the eSense Pulse we also have a complementary article about the Kubios HRV software.

The examples shown in this guide are mostly related to the eSense Skin Response. In principle, however, data from the eSense Temperature, eSense Pulse, eSense Respiration or eSense Muscle can be processed in the same way.

Exporting measured values from the Mindfield eSense app

The app also includes an archive where you can save and export your recordings.

Export data

By tapping on the export icon in the upper right or by tapping the “Export as CSV File” button at the bottom you can export the recordings in .csv format with all common apps (e.g. send via Messenger™, WhatsApp™, email etc.) or simply on your phone or in your cloud (e.g. Google Drive™ or Dropbox™).

The data is exported as.csv file (comma-separated values). You can open this file format e.g. with Microsoft Excel™ or Open Office Calc™ (free alternative to Excel).

If you like working with Google, Google Sheets™ (Google Tabellen™ in German) can also be an alternative to Excel for you. You can also open and visualize your exported.csv files and easily access them from multiple devices via the cloud. Google Sheets has similar functions as Excel and a very similar operation.

General Note

The exported files are always CSV files. CSV stands for “Comma separated values”. This means that a comma separates the values in the file (,).

These CSV files can be opened and edited with programs such as Microsoft Excel™, Google Sheets™. It is also possible to import and edit with frequently used programming languages or frameworks such as R™, Python™, Numpy™ or Tensorflow™.

These instructions refer to Microsoft Excel™ and Google Sheets™. We recommend beginners to use Google Sheets™ rather than Microsoft Excel™, because it is easier to use and it often works better with our measurements (f.i. the seconds are not automatically prefixed to dates, see in the section on Excel). Google Sheets is also a bit better at quickly creating charts automatically. Using Excel makes more sense if you are already more familiar with Excel.

You can find Google Sheets™ here: https://www.google.com/sheets/about/

Your settings at Excel™ and Google Sheets™ are decisive. The eSense app adapts the measured values to the language used. In English, the numbers are usually separated by a dot. Therefore, 1.5 in the English version becomes 1,5 in the German version. So if you open the CSV file with Excel™ or Google Sheets™ and the numbers don’t make sense, it’s usually because of different languages in the eSense app and Excel™ or Sheets™.

In principle, therefore, the following applies: If you use Excel™ or Sheets™ in German, you should also use the eSense app in German. If you use Excel™ or Sheets™ in English, you should also use the eSense app in English. This saves you the first two steps (replacing decimal separators and splitting values into columns) and you can start directly with step 3 (Apply skin conductance against time).

Microsoft Excel™

1. Replace decimal separator (only necessary if you have different language settings in Excel™ and the eSense app)

Press Ctrl+H (search and replace).
Replace all commas “,” with semicolons “;” (replace the column separator)
Replace all commas “,” with periods “.” (replace decimal separator)
(Alternatively, you can change the decimal separator used by Excel™ by default: Click File – Options – Advanced. Deactivate the item “Take over separator from operating system” and select dot as decimal separator and comma as thousand separator.

2. Split values into columns (only necessary if you have different language settings in Excel™ and the eSense app)

The values for time and measured value are still in the first column, separated by commas or semicolons. You must divide them into two columns.

Select the entire first column A
Click on the “Text to columns” function in the “Data” menu
Select file type “separate” or “Delimited” and click on next.
Choose the separator comma (,) or semicolon (;) depending on which character separates the values
Click on “Next”, Column data format “General”, and “Finish”.

3. Format seconds correctly (optional)

Excel often formats the seconds in the first column automatically to a date. Unfortunately there is no way to disable this, it is preset by Excel. But there are a few ways to solve this: https://support.microsoft.com/en-us/office/stop-automatically-changing-numbers-to-dates-452bd2db-cc96-47d1-81e4-72cec11c4ed8

4. Draw skin conductance against time

Select both columns. The first column with the seconds and another column with the measured value depending on the eSense sensor (Microsiemens for Skin Response, Celsius/Fahrenheit for Temperature, heart rate or RR interval or HRV amplitude for Pulse, RR or breaths per minute for Respiration) completely. Then press the CTRL and Shift keys simultaneously, hold them down, press the left, and down arrow keys. With this abbreviation, you can quickly select both columns, even for thousands of measured values).
Select the diagram type “Scatter” in the “Insert” menu and then the diagram type “Scatter with smooth lines and marker”. You get a diagram with the time in seconds in the horizontal axis. Alternatively, you can also select “Line”.
Note: If you are using the latest version of Excel™, you can also try “Recommended graphs”. Often Excel™ already recognizes the graph automatically.

**Create diagram (points with interpolated lines and data points)**

**The finished diagram (Type Line) of a measurement with the eSense Skin Response**

**The finished diagram (Type Line) of a measurement with the eSense Pulse**

5. Draw skin conductance against markers

First create the diagram from the previous step 3 (Draw skin conductance against time)
In the menu under “Diagram tools” -> “Chart Design” select “Select data”. A new mask will appear.
Under “Legend entries (rows)”, select “Add”.
Enter a series name (for example “markings”) and select your markings for the row values (in column F)
Select from the menu “Add chart element” -> “Data labels” -> “More data label options”.
A menu will open on the right. There you can select “Label options” -> “Value from cells” (and deactivate “Value” if necessary). Another mask opens and you have to mark your marks from column D again.
If you also want the lines to the positions in the graphs, you must select “Add chart element” -> “Drop Lines”
You can now adjust colors or fonts.

**The finished diagram with markers of a measurement with the eSense Skin Response**

6. Draw skin conductance against SCR

First create the diagram from the previous step 3 (Draw skin conductance against time)
In the menu under “Diagram tools” -> “Chart Design” select “Select data”. A new mask will appear.
Under “Legend entries (rows)”, select “Add”.
Enter a series name (for example SCR”) and select your SCR/min for the row values (in column F)
In the menu under “Chart Tools” -> “Design” select “Change Chart Type”. A new mask will appear. In the tab, select “All Charts” -> “Combo” -> “Custom Combination”. For the SCR, select “Clustered Column” from the drop-down menu and make sure that the tick next to Secondary axis is set (see also following screenshot).

**Another Combo-Chart with Skin Response and SCR**

Google Drive (Google Sheets™, recommended)

As in Excel™, complications with the separators can also occur here. The exported files are always CSV files. CSV stands for “Comma separated values. This means that a comma separates the values in the file (,)

Google often tries to format the data automatically. Then it can happen, among other things, that the measured values are interpreted as date. To prevent this, you should first make sure that you select “Format” -> “Number” -> “Number”.

1. Replace decimal separator (only necessary if you have different language settings in Google Sheets™ and the eSense app)

Press Ctrl+H (search and replace).
Replace all commas “,” with semicolons “;” (replace the column separator)
Replace all commas “,” with periods “.” (replace decimal separator)

2. Split values into columns (only necessary if you have different language settings in Google Sheets™ and the eSense app)

Depending on their language settings, the values for time and measured value are both in the first column, separated by commas or semicolons. You must divide them into two columns.

Select the entire first column A
Click on “Data” -> “Split text into columns” in the menu
Choose the separator comma (,) or semicolon (;) depending on which character separates the values as seperator

3. Apply skin conductance against time.

Mark both columns (Second and Micro Siemens/Celsius/Fahrenheit) completely
(Tip: click with the mouse into the column where “Measured values” is written. Then press the CTRL and Shift keys simultaneously, hold them down, press the left, and down arrow keys. With this abbreviation, you can quickly select both columns, even for thousands of measured values).
4.3. Select “Insert” -> “Chart” in the menu. Note: Google Sheets™ often tries to automatically create the right chart. Sometimes this works well, sometimes it doesn’t. If the diagram does not make sense, simply continue with the next steps.
Click on the diagram. A dialog box should open at the right margin. Select “Smoothed line chart” as the diagram type. For “X-axis”, make sure seconds are selected. For the “series”, make sure that your measured values are selected.

4. Enter main conductance against highlights

Delete column C with the time stamp
Mark the column with your measured values and the column with your markings simultaneously (as shown in the following screenshot)
4.3. Select “Insert” -> “Diagram” in the menu. -> „Diagramm“. Note: Google Sheets™ often tries to automatically create the right chart. Sometimes this works well, sometimes it doesn’t. If the diagram does not make sense, simply continue with the next steps.
Click on the diagram. A dialog box should open at the right margin. Select “Smoothed line diagram” as the diagram type. For the “series”, make sure that your measured values are selected. Your markings should be selected as “Labelling”. See also the following screenshot:

**Another diagram showing SCR and markers**

The diagrams made via Google Sheets can also be embedded via iFrame.

7. Streaming eSense data to a PC/Mac/Browser (eSense Web App, OSC)

We offer advanced users such as biofeedback trainers, therapists and coaches the ability to stream the measurement data of the eSense sensors via the eSense app to a PC as well. Thus, group courses can be realized or remote training, whereby the trainee can be in a very different place than the trainer. Even a remote supervision is easy.

All features described below are not public but available on request. In our online shop, we offer an eSense set for professional users (https://mindfield-shop.com/produkt/esense-set-exkl-sdk) , where the use of these features is included in the price. After unlocking, you can see these features in the settings in the eSense app when you scroll all the way down.

Currently, we offer you two ways to transfer data from the eSense App to the PC: our eSense Web App or the OSC Transfer. Both can even be used in parallel but usually it makes sense to use either one of them. The OSC protocol is used for fast and timely streaming and actually comes from the music industry. OSC is open-source and there are a lot of possibilities to integrate the protocol into existing software.

eSense Web App

With the eSense Web App for iOS and Android, we have also developed an eSense web app for the browser, which mirrors and supplements the eSense mobile app.

You need an account for the eSense app and one of our plans. You can analyze your recorded data in the browser (with the basic plan) or even stream it in real time to a PC (with the premium plan). With the eSense Web App you can view the measurements of several and different eSenses simultaneously and in real time.

For example as professional user you can watch and look after a group of 5 different users, each with their own eSense. Different sensors, for example an eSense Skin Response with an eSense Pulse or Temperature or Respiration, can be freely combined. The users can even be distributed around the world. They just need a smartphone, an eSense sensor, the mobile app and a booked plan. More information about the plans soon here.

**eSense Web App at a live measurement with the eSense Pulse**

As a private user, you can also benefit from the fact that you can see the graph even better with a large screen and enlarge individual areas.

You will find the eSense Web App at https://esense.live. There you can log in with the same account (username and password) as for the eSense mobile app.

OSC Transfer

OSC (https://opensoundcontrol.stanford.edu) stands for “Open Sound Control” and is an open-source network protocol developed by the University of California at Berkeley. It is widely used in the music industry because it is great for processing different signals in real time (for example, at a concert where it is important to match multiple microphones and lights in real time).

This makes this protocol particularly well suited for the data transmission of several eSenses in real time. Due to the wide distribution in the music industry, there are already some extensions and plugins which you can adjust relatively easily and use in a self-designed software. These are usually found in all common programming languages like for Android, iOS, Java, Javascript, C ++, Python and many more.

To use OSC with the eSense app, you must define the IP address of the user receiving the data. This can be a local IP address or an IP address on the internet. You can define the ports as you wish. You should pay attention to firewalls, as they like to prevent the flow of data.

You can also define a variable in the app to be able to assign different eSense. This will allow you to sort or filter the eSense (or users) and analyze it better.

The OSC transfer is aimed at programmers of (Windows or Mac) software who want to integrate the data from the eSense. The available OSC libraries in the usual programming languages make such integration very easy.

You can enable OSC Transfer in the general settings in the eSense app (see screenshot)

8. Duplicate eSense on a large screen (screen mirroring)

With the eSense app, it is possible to display the screen content of a tablet or smartphone on a larger screen, which is known as stream mirroring. This allows you to watch your biofeedback training at home on your big screen TV, for example, which can improve your training.

The following instructions can be used with all eSense devices. An adapter is always required:

Smartphone / tablet (with the eSense app) Adapter TV / projector

We generally recommend iOS devices.

Android

With Android, it only works with newer devices that have a USB-C output and a 3.5 mm jack plug. Android devices with micro USB do not work.

Our recommendation is this adapter on Amazon:

JSAUX USB C HDMI Adapter, 4K USB Type-C Thunderbolt 3 auf HDMI Adapter https://amzn.to/3Use9Hp

eSense Skin Response, Temperature and Respiration: If your device no longer has a 3.5mm jack plug and you are already using a USB-C to 3.5mm jack adapter for the eSense, unfortunately you cannot use the USB-C to HDMI adapter.

Wireless with HDMI dongles (Miracast / Chromecast etc.)

We have had rather mixed experiences with the common HDMI dongles. There are many options, but the dongles generally require an external power supply and are rather complicated to set up.

We therefore advise against using them, but in principle it works and is an alternative if no further adapter is available in the device (because the device only has a USB-C but no longer has a 3.5mm jack plug).

iOS

You can connect a Lightning Digital AV Adapter or a USB-C Digital AV Multiport Adapter to the Lightning port of your iOS device and use an HDMI cable (sold separately) to connect your iOS device to a TV or projector.

In principle, this is possible with any iPhone, iPad and iPad Pro that are also compatible with our eSense app.

We expressly recommend only original Apple adapters. Others may work under certain circumstances if they have MFI certification. However, Apple could change something at any time, so we do not recommend third-party adapters, which may not be updated quickly enough and may no longer be compatible.

You can find the original Apple adapters on Amazon:

Apple Lightning Digital AV Adapter https://amzn.to/3y7ndtY

Apple USB-C-Digital-AV-Multiport-Adapter https://amzn.to/3wdvoEx

eSense Skin Response, Temperature and Respiration: iOS also requires a USB-C to 3.5mm jack adapter for these eSense devices (this is not required for the eSense Pulse and Muscle as they connect to the smartphone or tablet via Bluetooth).

This means that if you want to use an iPad with the eSense, it should also have a 3.5mm jack connection. The iPad Mini 5 would be an example, this is slightly older, but still has the 3.5mm jack connection. For normal iPads, the 9th generation devices were the last with the 3.5mm jack connection. We recommend https://www.refurbed.de/c/ipads/ or https://www.rebuy.de/kaufen/apple-tablets to purchase these at a reasonable price.

Wireless with Airplay

We have had good experiences with AirPlay. The setup at Apple is very simple, the best solution is probably a used Apple TV from 50 euros: Apple TV 4K Gen 1 https://www.refurbed.de/p/apple-tv-4k-5th-gen/

Mini projector

There are now also relatively good mini projectors available for an acceptable price. In our experience, these are not particularly bright, but in a sufficiently dark room they are an option.

The projector only needs an HDMI input.

9. Troubleshooting connection problems

Make sure that not only Bluetooth® but also GPS or location is activated on your device. We will NOT determine your location. It is a mandatory requirement of Google / Android that GPS must also be active when using Bluetooth®. We cannot change anything, but have to accept this. No GPS data is used by our eSense App.
If you have problems connecting to the eSense Pulse, please check that the eSense Pulse is NOT paired in the Bluetooth® settings of Android / iOS. This is not allowed. Otherwise, it cannot be paired in the eSense app anymore. Remove the pairing there if necessary. The connection between eSense Pulse and your Smartphone/Tablet is only established within the eSense App. As mentioned under 1., Bluetooth® and GPS must be activated and the eSense App must have received the requested authorization to use these two functions. The query for use comes up the first time the app is started and must be affirmed.
If the eSense Pulse cannot be found in the settings of the eSense App, please check the battery. Reset the eSense Pulse once by removing the battery, put on the eSense Pulse WITHOUT battery at the chest strap and remove it again. This triggers the reset. Then, insert the battery again or connect a new battery and the chest strap again. Then try reconnecting the eSense Pulse in the settings of the eSense App.
Please make sure to use electrode contact spray. Without bad electrode contact, a connection may not occur.

10. EC Declaration of Conformity

in accordance with the following directive(s):

Radio Equipment Directive (2014/53/EU)
RoHS – Restriction of (the use of certain) hazardous substances (2011/65/EU)
WEEE Waste Electrical and Electronic Equipment (2002/96/EG & 2008/34/EG)

The manufacturer

Mindfield Biosystems Ltd.
Hindenburgring 4
D-48599 Gronau
Germany

WEEE-Reg.-Nr. DE 24465971

hereby declares that the following product:

“Mindfield® eSense Pulse”

complies with all applicable essential requirements of the directives.

It is in conformity with the applicable requirements of the following documents:

DIN EN 60950-1 Information technology equipment – Safety – Part 1: General requirements (2013)

DIN EN 62479 Assessment of the compliance of low power electronic and electrical equipment with the basic restrictions related to human exposure to electromagnetic fields (10 MHz to 300 GHz) (IEC 62479:2010, modified)

ETSI EN 300 328 V2.1.1 (2016-11)

ETSI EN 300 440 V2.1.1 (2017-03)

Place: Gronau
Date: 19th of December 2018
Niko Rockensüß, Managing Director

According to legal requirements, the Mindfield eSense has to be recycled as electrical waste.
WEEE-Reg.-Nr. DE 24465971

11. Contact

Mindfield® Biosystems Ltd. · Hindenburgring 4 · D-48599 Gronau

Tel: + 49 (0)2565 406 27 27 · Fax: + 49 (0)2565 406 27 28 · E-Mail: info@mindfield.de

If you have questions about our products or need support, please do not hesitate to contact us! To avoid inappropriate advertising and spam, we ignore messages with specific content. We therefore ask you to not write links in the contact form. If this should be necessary, please write us an email.

Please do not send unsolicited packages to us. Unfree returns will not be accepted and cannot be processed.

12. General information on heartbeat and heart rate variability

Our hearts keep us alive and work tirelessly throughout our lives. It pumps the blood through our body, so that oxygen-rich blood penetrates all the parts of our body and oxygen-poor blood is enriched again in the lungs with fresh oxygen. But it also keeps everything moving, including the transport of nutrients, hormones, immune cells, etc.

It is easy to know that our heart is beating, you can feel your pulse or even hear it when you put one ear to the chest of another person. Since time immemorial, we have been studying and measuring the functions of the heart and measuring the heartbeat is essential.

Depending on the situation, our heart is able to regulate the heartbeat. When we sleep, it usually beats slowly and evenly, when we exercise, it beats fast and adjusts its frequency constantly. Depending on the creature, the resting pulse changes: only six heartbeats per minute for a blue whale and 1,000 heartbeats per minute for a shrew. We humans lie with approximately 60 heartbeats per minute in the lower range, infants have a faster resting pulse of approximately 130 beats per minute. With great effort, our heart can also beat at over 200 beats per minute.

Heart rate variability (HRV) refers to the ability to change the frequency of the heart rhythm. Even at rest, there are spontaneous changes in the time between heartbeats.

Our body has a multitude of regulatory mechanisms to change the heart rhythm. Two essential components are the sympathetic nervous system, which activates and accelerates the heartbeat, and the parasympathetic nervous system, which acts as a brake to slow down the heartbeat.

A healthy person constantly adapts the heart rhythm to current requirements. In addition to physical exertion, such as sport or physical work, psychological exertion such as stress also results in an increase in the heart rate. The heart rate sinks again when the strain is relieved and the body relaxes. In humans, heart rate variability ranges from 10 (low, a sign of stress) to 30 (high, a sign of relaxation).

The more our body is able to regulate the heart rate (the greater the heart rate variability), the healthier we are. If the heart beats only rigidly, a person is about to die.

The measurement of heart rate variability is a large field in cardiology and is used for extensive diagnostics. With the eSense Pulse, we want to focus on biofeedback training, i.e.improving heart rate variability. To describe the current state and progress of the training, the eSense app also provides the essential statistics and analyses of HRV.

We combine the measurement and feedback of heart rate variability in the eSense app with guided relaxation exercises and guided meditations and offer you an overall experience that goes beyond biofeedback. In addition to extensive feedback variants, you have the option of evaluating your measurements with many statistics, documenting your progress and exporting the recordings as CSV and PDF files. Your data belongs only to you! You have full access to the raw data.

13. Features of the eSense Pulse

The eSense Pulse is a pulse sensor that uses a smartphone/tablet and an app to accurately measure heart rate variability. We focus not only on measurement, but also on biofeedback training to improve your heart rate variability and health!

The eSense Pulse with the eSense App offers you:

a precise 1-channel ECG with 500 Hz sampling (internal)
transmission of RR distances in milliseconds at 5 Hz via Bluetooth® Low-Energy
a chest strap that is comfortable to wear, washable and durable
optimal skin contact with the help of supplied electrode spray
unlimited recording duration
unlimited number of sessions and users
extensive statistics on heart rate variability (time and frequency data)
Real-time Fast Fourier analysis with spectrogram
breathing aid for breathing training with freely adjustable intervals, auxiliary tones and more
Export of measurement data as CSV file, compatible with other software programs for further analysis (e.g. Kubios)
Export of curves, diagrams, and statistics as a PDF report
To train and improve HRV, the app offers a wealth of biofeedback feedback on HRV amplitude:
- Bar feedback (HRV or breathing aid)
Set any number of markers during a recording
Different, premade training procedures are included in the app
Free training according to your wishes with any biofeedback variant or several at the same time
Extensive in-app help and manuals
Regular updates of the app
Integration with a real breathing sensor to record respiration during the HRV measurement (eSense Respiration sensor, optional available)

14. Explanation of the individual measured values

Score (developed specifically by Mindfield)

For the Mindfield app, we have developed our own score system. This score, developed by us, should simply tell you how good your heart rate variability is with just one number.

Simply put, the better your heart rate variability, the higher this value.

In detail: The score is the sum of the regularity of the curve (in percent) and the amplitude (absolute value) divided by the rate of data from eSense Pulse (which transmits the last measured values via Bluetooth® every 200 ms) plus the previous score.

Therefore:

Whereby the time interval between Score and Score₀ is just 200ms. If Regularity Percent << 90 then:

Thus, especially measurements of the same duration can be compared well (for example, if you always set 15 minutes as the measurement duration in the settings), since a higher regularity of the curve and / or a higher amplitude but constant time results in a higher value.

Regularity (developed specifically by Mindfield)

We also included the regularity as another value. This is also recorded by a formula developed by us and displayed in color (from a measurement duration of 5 minutes or more) in the overview after the measurement:

Attention: The colored coloring of the regularity does not correspond 100% with the color distribution in the pie chart as these are detected in different ways.

For the background coloring of the oscilloscope, a period of 20 seconds is taken and it is determined which regularity value is the most common color.

The pie chart, on the other hand, uses all the numeric regularity values of the entire session, with the percentages in red, yellow, orange, and green taken from them.

General HRV values

As an introduction to all measured values, we would like to briefly point out that the terms RR and NN mean the same thing but are used alternately in science and literature. The RR or NN interval is the distance between two heartbeats, in milliseconds.

Put simply, you train as much variability as possible between these intervals. The analysis of this distance data is possible in different parameters, which allow for different conclusions about the condition of your nervous system.

Time-based measured values

SDNN
(”Standard Deviation of the NN Interval“) is the standard deviation of the RR intervals. Put simply, how do the intervals deviate on average from the average of all intervals? Suppose you have a value of 68ms. This means that, on average, one heartbeat deviates from the next heartbeat by 68ms, which is 68ms earlier or later than the previous heartbeat. The higher this value, the higher your overall heart rate variability, which means the better your body can adapt to changes. You can also see how well Sympathetic and Parasympathetic work together.

RMSDD
(“Root Mean Square of Successive Differences”) is one of the most important parameters that provides information about the activity of the parasympathetic nervous system. It describes the short-term variability of the heartbeat, how strongly the heart rate changes from one heartbeat to the next. This is how the RMSSD value is calculated: The temporal difference of successive RR intervals is multiplied by itself to obtain only positive values. These intermediate values are summed and divided by the number of RR interval differences to obtain the mean value. The square root is drawn from the mean of these squared differences. The RMSDD is often referred to as the body’s ability to recover or the nervous system’s “brake.” The larger this number is, the better.

NN50
The number of pairs of RR intervals that are more than 50ms apart. The larger this number is, the better. However, only compare sessions of the same length and under the same conditions (e.g. sitting position, before/after sports, mornings/evenings, etc.).

pNN50
The percentage of pairs of RR intervals that are more than 50ms apart. The larger this number is, the better. However, only compare sessions of the same length and under the same conditions (e.g. sitting position, before/after sports, mornings/evenings, etc.).

Average RR
The average RR (also sometimes called RR interval or NN interval) is the average distance between two heartbeats. It is thus the reciprocal of the heart rate.

To get a feeling for this value, just think of the following three examples: If you have a resting pulse of 60 beats per minute, the average RR is exactly 1,000ms or one second (since one beat per second). If you are doing light to medium physical exertion at 120 beats per minute, then the RR is 500ms, or half a second (since two beats per second). If you’re working very hard to get your pulse up to 180 beats per second, the RR is 333ms or a third of a second (because three beats per second). For this value, there is no better or worse, the bigger or smaller. The only statement that can be made is that the higher the value at rest, the slower your resting pulse, which, for example, is a sign of fitness and a strong heart muscle in endurance athletes.

Stress Index
The exact formula: Stress index (SI) = AMo / 2Mo x MxDMn. Where AMo is the amplitude of the modal value and represents the percentage in comparison to all other RR intervals. Mo (in the formula 2Mo) is the modal value for the duration of a RR interval that has been measured the most often. MxDMn is the variability width, or in other words the difference between the maximum and minimum measured RR interval. Simply put, this formula calculates how adaptive the heart is or the value of the heart rate variability (HRV). A good relationship between the sympathetic and the parasympathetic reaches scores of 30 to 150 points. At 500 – 1000 points, limitations of adaptability are already assumed. Over 1000 points is an indication of a high level of exertion or stressful circumstances. Of course, it must also be noted that the SI depends on the respective situation. It makes a difference whether you are sitting quietly or exercising physically. However, at least in general terms, the lower the stress index (SI), the better. The more rigid and less variable the RR intervals are, the higher the stress index scores.

Frequency-based measured values (available as in-app-purchase)

In addition to the time parameters, we have also integrated frequency-based parameters into the analysis. A Fast Fourier Transformation is performed during each measurement from start to finish. You can observe the resulting spectrogram during the measurement in the last slide in landscape format.

VLF
(“Very low frequency”) is the HRV in the range from 0.0033 to 0.04 Hz. The VLF requires measurements with a length of at least 5 minutes. The VLF also differs from the LF and HF by a different characteristic. The changes in the VLF frequency band are visible longer. The VLF band is therefore the component for slow recovery.

LF
(”low frequency“) is the HRV in the range from 0.04 to 0.15 Hz. This allows vibrations in the range of about 10 seconds to be recorded. Here, the activity of the sympathetic nervous system is well reflected, with very slow breathing also in the upper range at 0.15 Hz of the parasympathetic nervous system. The higher this value is, the more distinctly the sympathetic nervous system is active in the center of gravity.

HF
(”high frequency“) is the HRV in the range from 0.15 to 0.40 Hz. This includes oscillations of about 2-7 seconds, in which the heart beat is often influenced by breathing (RSA = respiratory sinus arrhythmia). This also clearly shows the activity of the parasympathetic nervous system. The greater this value, with even, quiet breathing, the more pronounced the activity of the parasympathetic nervous system.

LF / HF ratio
LF / HF Ratio is the ratio between the HRV in the low frequency band (Low Frequency) to the HRV in the high frequency band (High Frequency). It thus expresses the sympathovagal balance. Since the LF band can be traced back to the sympathetic and the HF band to the parasympathetic, the LF / HF ratio indicates a possible dominance of the sympathetic or parasympathetic nervous system. If the LF / HF ratio is high, this indicates a dominance of the sympathetic nervous system. Typically this occurs in “fight or flight behavior”. A low LF / HF ratio indicates a dominance of the parasympathetic nervous system. This is a sign of relaxation and harmonious behavior.

15. Introduction to eSense Pulse

There are various methods for measuring the heartbeat. With the eSense Pulse, we have decided on a chest strap that performs a 1-channel ECG measurement. There are two electrodes in the chest strap which require good, direct skin contact. The chest strap must always be worn under clothing.

In order to ensure a good contact between the electrodes and the skin, the enclosed electrode contact spray or an equivalent electrode gel should be used. Without it, the heartbeat sensors will not take sufficient measurements, which makes a precise HRV measurement difficult. For more information, see the article about the open training.

The eSense Pulse uses a 500 Hz sampling rate (500 times per second) to determine heart beats and wirelessly transmits the time between two heart beats to your smartphone/tablet and the eSense App in milliseconds via Bluetooth®. Compared to the normal electrocardiogram (ECG), in which the waveform is very important, the measurement of heart rate variability focuses on the temporal resolution of the RR intervals.

With this data, the eSense App can then perform various calculations, such as determining the heart rate (beats per minute or, colloquially, the pulse), the heart rate variability with various analysis parameters and biofeedback training. In the article explanation of the individual measured values, all parameters of the eSense App and their meaning are explained clearly.

It also important to note that heart rate variability benefits respiration. Of particular interest is the coupling of heartbeat and respiration in order to determine the degree of coherence or synchronization of heart rhythm and respiratory rate. This is also done in the eSense App.

The heart rate increases when inhaling and decreases again when exhaling This phenomenon is called respiratory sinus arrhythmia (RSA) and is used to check the balance of the nervous system. Biofeedback training in the eSense App uses this phenomenon to improve heart rate variability with the help of a breathing target.

Regular biofeedback training with the eSense Pulse has a positive effect on heart rate variability and RSA, and both have a positive effect on a number of stress-related problems. Bring your nervous system back into balance!

16. Operating instructions for the eSense Pulse

Contents of the packaging:

eSense Pulse sensor unit (with colored eSense Pulse logo)
eSense Pulse Chest Strap, variable length adjustable
electrode spray

Remove the eSense from its packaging. Put on the chest strap as shown and adjust it to the correct length.

The strap should be tight, directly under the chest muscles, but not uncomfortably tight or squeezed. Once you have adjusted the belt, remove it again to apply a small spray of the enclosed electrode contact spray to each electrode. This surface separates the two electrodes from each other! No “bridging” may occur here.

This process significantly improves the conductivity and the ECG signal becomes clean and precise. Put on the belt again and press the eSense Pulse Sensor on the two push buttons. Make sure that the eSense logo on the front is not upside down for a person looking at you. You will also find an “L” for left and an “R” for right on the push buttons on the sensor.

Now the eSense Pulse is ready to use and can be connected to the eSense App. In case of any connection problems, briefly remove the sensor and reconnect it to the belt. This will switch it on and off. To prevent the battery in the sensor from being used up unnecessarily, always disconnect it from the belt when not in use.

Battery Change & Battery Information

The battery has a service life of approx. one year if used regularly. You can read the current state of charge in the eSense App. A replacement battery type CR2032 is available in our online shop or in any electronics store. Dispose of a used battery professionally and not in the household waste. Batteries are very dangerous if swallowed. For this reason, keep batteries and small parts away from children. If a battery has been swallowed, consult a doctor immediately.

To change the battery, open the battery compartment by turning it counterclockwise with a coin. The battery is facing up with the positive pole. Insert the new battery and close the battery compartment again by pressing on the cover and turning it clockwise for a short time.

Cleaning and Care

Important instructions for cleaning and care:

Do not wash the belt and sensor in the washing machine or put them in the dryer.
Before cleaning the belt, remove the sensor as it is not washable.
You can wash the strap by hand, but do not use water warmer than 30°C.
Ironing, bleaching and heating are strictly forbidden.
Do not drop or use force against the sensor.
Avoid exposing the sensor to high temperatures or sunlight.
If the eSense Pulse is stored near freezing, allow it to warm to room temperature before next use.
Do not attempt to open the sensor except for the battery compartment.
If you will not be using the eSense Pulse for a long time, remove the battery from the sensor.

17. Heart Rate Variability and Biofeedback Training

In order to reduce stress and its symptoms, biofeedback training can be performed seeking to increase heart rate variability.

Biofeedback training is quite applicable to heart rate variability In stress medicine and psychophysiology, HRV biofeedback is used for depression, heart disease, asthma, anxiety disorders and insomnia. HRV biofeedback is also widely used in coaching and competitive sports. Improving HRV and the connection between breathing and the heart can help relieve tension, cope with stress and anxiety, and contribute to a more relaxed response in everyday life. If you suffer from a serious disorder or medical condition, always consult a professional physician or therapist, and do not attempt to treat yourself. The eSense Pulse is not a medical device and may only be used to reduce stress.

The eSense Pulse is a very precise device. It can record heartbeats and display them, for example, as a measurement curve. Take a look at the following example of a measurement at rest and with even, slow breathing:

**Example measurement curve from eSense Pulse at rest**
**and** **pronounced heart rate variability.**

As you can see in the example above, the curve is a distinct sine wave and the amplitudes are very uniform.

The aim of HRV biofeedback is to increase heart rate variability, specifically its amplitude. In other words, to maximize the difference between low heart rhythm and high heart rhythm in the interplay of inhalation and exhalation, rest and demands. Under demands and with uneven breathing,

HRV and its curve shape decreases significantly, as shown in the figure below:

**Exemplary measurement curve eSense Pulse for tension**
**or demands and** **low heart rate variability.**

In the above example, the curve is uneven, and the deflections are different. Especially from 6:30 and 6:50 the line is almost horizontal with almost no amplitudes.

If respiration is included, the eSense App offers various ways to visualize it and to define respiration in a certain rhythm. The coupling of heartbeat and respiration is greatest in most people when breathing at about 4.5 to 6.5 breaths per minute.[1]

In the eSense app, you can do a free training or complete predefined procedures. The amplitude of HRV is measured and an increase is providing positive feedback, while a decrease provides negative feedback. A change in breathing is also linked to feedback.

[1] Lehrer, P. M. (2013). How does heart rate variability biofeedback work? Resonance, the baroreflex, and other mechanisms. Biofeedback, 41, 26-31.

For feedback, there is, for example, a video, that continues to run in the positive case (stops in the negative case), music, whose volume changes, tones, which change pitch, vibration of the Smartphone and much more. Of interest is the function for controlling a smart light bulb (Philips Hue or Magic Blue), whereby heart rate variability is reflected in the change in color and brightness of one or more lamps. You can use your stress level to illuminate an entire room.

A biofeedback training consists of four training stages. Plan about 60 to 90 minutes for the first session, during which you can do the training undisturbed and in one session. Detailed instructions can be found in the chapter, “Training sequence.”

18. Procedures

A procedure consists of different modules. The procedures can be used, for example, to implement instructions for relaxation, a stress test, a defined biofeedback training session or tasks for research purposes.

The possibilities are manifold. During a procedure, your heart rate variability is naturally recorded. At the end of a procedure, a summary is displayed, showing your readings for each module and the overall view.

We recommend that you try the demo procedures included in the app. These give you a guided overview of the different modules and functions.

The included procedures are also protected by a password in order that those can’t be edited or deleted by accident. You can any time create a copy of those procedures without a password and change it as you wish.

We also explain in detail how you can create and edit your own procedures in the chapter procedures settings.

19. Open Training

As a second option you can also conduct an open training. This is compared to the procedures a bit more complex. We therefore explain a typical open training session which consists of 4 training phases.

Preparation and start

Follow the first steps of preparation from the previous chapter and choose an open training in the selection screen after starting the app
Now start a free measurement (simply press “Start” in the main screen) and take a first look at the measured values of your pulse rate. An adult’s resting heart rate is usually between 60-80 heartbeats per minute. You will immediately see this value as the current measured value with the unit “HR” (heart rate).
In order to to be able to compare sessions optimally, you can set the time for a measurement in the settings of the eSense App and limit it to a value, e.g. 10 minutes. The measurement then stops automatically after this time has elapsed. In the default setting of the eSense App, the measurement duration is unlimited. It is recommended to set a time after the first experiments and to adjust the settings to correspond to the desired, regular training duration. This way, you will get an optimal evaluation and be able to compare your training sessions later on.

First stage (observe and experiment; determine your initial status)

First, determine a 10-minute baseline (default state without influence) at rest. It is very important to always compare measurements of the same length, so use the option in the settings to set the session length to a fixed duration. Now set the session length to 10 minutes.
Try to relax as much as possible and DO NOT observe the measured valuesduring these first 10 minutes, this would compromise the measurement.
Use your breathing to relax, breathe calmly, deeply and evenly as you feel comfortable.
Keep your smartphone or tablet in landscape mode. Look at your HRV curve after the first 10 minutes. Were there sections of an even curve? Were there strong fluctuations and irregularities? How do you rate your ability to relax during the measurement? You may already be able to determine a connection between the curve and the tension or relaxation you feel. If not, no problem – this will come. Good relaxation goes hand in hand with high heart rate variability and an even curve. Distractions and irregular breathing will result in a decrease in HRV and an irregular curve.

**Example of a measurement curve of a 10-minute baseline**

After completion of the 10-minute baseline, you will first be shown a survey. Answer the questions and make notes if necessary. You will then see a pie chart showing you the time when HRV has increased, decreased or remained the same. The more HRV has risen, the better. Next to the pie chart, you will see a table with measurements and statistics. These are used to assess your condition and compare training progress. In the article explanation of the individual measured values, all parameters of the eSense App and their meaning are explained clearly in detail.
This is now your initial training status. Of course, the respective day also plays a role: It should make a difference whether you measure after a stressful working day (or even during work) or at the end of a relaxed weekend. Use the corresponding function of the app to export this baseline as a CSV file. You can do this by calling up the measurement in the archive. With this, you can later (besides the archive) also access your baseline in other ways (e.g. in Excel). You can also export a PDF file of curves and statistics from the archive.
One more tip: If the measured values are disturbed for no apparent reason, the skin contact was not optimal, or the sensor was electrostatically charged. To “discharge” the sensor, remove the battery once and reattach the sensor to the chest strap without the battery for a few seconds. Then reinsert the battery. Use sufficient electrode spray and repeat the measurement.

Second training phase (targeted biofeedback training based on the measured values)

The second training phase consists of several measurements, which should always be carried out according to the scheme described below. You should practice targeted relaxation with the help of feedback.
Start the measurement and observe your measured values for a while. The aim now is to increase the amplitude (i.e. the size) of the heart rate variability. In the main screen of the app in portrait format, you see the amplitude in the form of a bar. This is the most direct form of display. In landscape mode, you see the HRV amplitude as a numerical value.

**HRV-Amplitude im Hochformat (rot markiert)**

First of all, try to increase the HRV amplitude by relaxing and breathing calmly and evenly. You can test different approaches and techniques of relaxation, such as conscious control of breathing (deep inhalation and exhalation), muscle relaxation, auto suggestion and much more. Here, your joy of experimenting is in demand! The device gives you precise information about the resulting effects. Also observe small changes in the measured values. Remember the maximum HRV amplitude you could achieve.

Practice an increase in heart rate variability, including the breathing aid. You can activate the breathing aid in the app settings, it is not active by default. Activate it and start breathing training at your usual breathing rate. This will, in most cases, be between 12 and 15 breaths per minute. This is faster than quiet breathing during deep relaxation. However, it is easier to start with your “normal” breathing first and then gradually slow down your breathing pace to below 10 breaths per minute. Set the inhalation and exhalation times in the breathing target as desired. (For 15 breaths, set 2 seconds for inhalation time and 2 seconds for exhalation time, or 3 seconds for inhalation and exhalation time if you want to try 10 quiet breaths per minute). It is helpful to breathe out a little longer than in.

Here is an example of a first exercise at 12 breaths per minute:

**2 seconds for inhalation and 3 seconds for exhalation (5 seconds per breath / 12 breaths per minute)**
**(5 Sekunden pro Atemzug / 12 Atemzüge pro Minute)**

Train using the different biofeedback features the app offers. In landscape mode, you also have the breathing aid as a line. You choose a video, which stops when the HRV amplitude falls and continues when it rises. You can also use music and sounds that you can activate in the settings. The individual feedback functions are all described in more detail in the corresponding chapter of the manual.
Use the supplied procedures! This allows you to get to know the different functions of the app even better and to perform standardized training. If you like, create your own individual procedure with your favorite feedback variants.

Third training phase (provocation, relaxation and stress management)

In the third training phase, stress stimuli are used in order to train stress management. HRV biofeedback is well suited for using targeted provocation methods, as it shows a timely and sensitive reaction to a stimulus, and also because this reaction is also proportional to the strength and significance of the stimulus.
Start the measurement and observe your measured values for a while. Then try to relax. The training begins with a resting phase of a few minutes.
Now a stressor (stress stimulus) should be used. Examples are: negative thoughts, looking at emotionally charged pictures or objects, as well as unpleasant noises. As a rule, everyone knows things that make them tense or excited. For example, if you do not like to speak in front of large crowds, try to make a speech spontaneously or imagine this situation. If such a stressor acts on you, observe the readings and you will probably see a drop in HRV amplitude and a more irregular curve. Then, try to increase the amplitude again and make the curve even again.
During a training session, you can alternate phases of relaxation and stressors about three to four times. Always end a session with a rest phase and do not overtax yourself. Do several training sessions over a longer period of time until you feel you are less sensitive to stressors or recovering more quickly.

Fourth training phase (transfer, relaxation even without feedback)

Now you should check whether you have been successful in your training and whether you have already gained the ability to relax without feedback. To do this, carry out another 10-minute baseline measurement and try to relax as much as possible. DO NOT observe the measured values. Only consider how this measurement behaves in comparison to the baseline from the first training phase afterwards. In the archive, it is possible to compare sessions with each other. It is to be expected that many values have improved. Of course, your daily form also plays an important role here. Repeat the baseline measurement later if necessary. It is very important to always compare measurements of the same length, so use the option in the settings to set the session length to a fixed duration then it stopes automatically.
As another transfer exercise, you can work with a stressor again and then try to relax, NOT observing the measured values. Check afterwards whether you succeeded in improving your measured values. If you succeed in this and the comparison with the first baseline also shows a clear improvement, you have successfully completed successful stress reduction training. If you now find yourself in a stressful situation in everyday life, think of your training sessions. Stay relaxed by using the skills learned here. The same applies here: Regular practice makes perfect!
Our eSense App offers free training as well as the use of procedures. These are ready-made training programs which you can customize according to your wishes. For an optimal comparability of training sessions, they should always be carried out under identical conditions (e.g. same time of day) and with identical length. The procedures are a great help. You can read more about this in the corresponding section of this manual.

20. Kubios HRV Software

The Kubios HRV Premium Software offers you detailed HRV-analysis with its over 40 analysis parameters and can be perfectly combined with the eSense Pulse. You can easily import an eSense Pulse CSV file from our eSense app into the Kubios software.

Analysis of your measurements with Kubios

Some parameters (e.g. SDNN, RMSSD, pNN50) are measured different in the eSense app than in the Kubios software. You can adjust the settings in Kubios so that the data are identical. To do this, you must ignore all header lines up to line 34 in the settings. Select column 3 (which contains the RR intervals in milliseconds) as the data column.

21. Smart Bulbs (optional)

**Smarte Glühbirne in Verwendung mit dem eSense Skin Response**

The eSense app can support biofeedback via smart bulbs. Smart bulbs can change their colors and brightness and can be controlled via Bluetooth®. In combination with the eSense app, smart bulbs indicate your level of stress or relaxation through their lights.

Currently, the eSense app supports the Magic Blue and Phillips Hue smart bulbs. Both are smart bulbs which can be controlled via Bluetooth®. The color as well as the brightness can be adjusted. From within the eSense App, you can connect to the Magic Blue or the Phillips Hue and use it in your biofeedback session. Here you connect to the Hue Bridge from the eSense app and select the desired lamps.

Magic Blue

Unfortunately, the Magic Blue is no longer in production. We have extended the eSense app to enable the use of Philipps Hue smart bulbs, which can be controlled via Bluetooth.

But you still can find more information about the Magic Blue in our article

Philips Hue

You should be able to find the Phillips Hue in every well-sorted electronic store. You can also order it online. A list of the on- and offline-merchants can be also found on the page of the Phillips Hue: https://www.philips-hue.com/en-us

We suggest you use one of the starter kits from Phillips, with the eSense. This also contains a colored bulb (‘Color Ambience’): https://amzn.to/3uzSFx8.

The use of Philips Hue is available as an in-app purchase in the eSense app.

You can also find more information about the Philips Hue in our article.

22. Philips™ Hue™ FAQ

eSense App and Philips Hue

Which products from Philips Hue can I use with the eSense app?

In general, all Philips Hue products are compatible with our eSense App and therefore can be used together with the eSense. We tested the most common products:

Philips Hue White
Philips Hue White Ambiance
Philips Hue White and Color Ambiance
Philips Hue Go (very nice!)
Philips Hue LightStrips White and Color Ambiance

For the best experience, we recommend the Philips Hue White and Color Ambience, because with the colors, the feedback can be enhanced more than with only white colors. Especially we recommend using the Philips Hue Go, as it is mobile with battery and a very nice, complete lamp.

How do I connect to the Philips Hue within the eSense App?

You have 2 options: You can connect the Hue in the eSense app via the bridge with Zigbee or directly via Bluetooth (which is mainly the case with the newer Hue lamps).

To connect to the Philips Hue products, open the eSense app and follow these steps:

Choose the eSense sensor you want to use
Choose the ‘settings’ (cogwheel symbol)
Activate the “Smart bulb feedback” and select one of the two Philips Hue light bulb options (either the “Philips Hue ZigBee™ + Bridge” option or the “Philips Hue Bluetooth™” option)
Press the “Change Hue settings” button for the Bridge option or select your Philips Hue for the Bluetooth option
For the Bridge option: Select “Find Hue Bridge” in the tab at the top right and then click on the plus symbol at the bottom right. Follow the instructions
Next you can choose the lamp(s) under ‘Hue lamps’ in the upper left. You see a list of available lamps and you can choose each with the tick right next to it. Selected lamps light up, deselected turn off.
(You can also test the selected light bulb by tapping on “Test”. If this changes the color or brightness of the light bulb, this light bulb is connected)
Once you have selected the bridge and/or bulb(s), exit the settings by tapping on the tick in the top right-hand corner. The settings are now saved for you

How do I connect the Philips Hue within the Hue App?

Download and Install Hue Bluetooth App: Download and install the Philips Hue Bluetooth app from your device’s app store. Ensure that your device supports Bluetooth Low Energy (BLE).
Power On Your Hue Lights: Make sure your Philips Hue lights are connected to a power source and turned on. The lights should start emitting a default light pattern once powered on.
Enable Bluetooth on Your Device: Turn on the Bluetooth feature on your smartphone or tablet. Make sure it’s discoverable.
Open the Hue Bluetooth App: Launch the Philips Hue Bluetooth app on your device. Follow any initial setup instructions or prompts.
Add Lights: In the app, navigate to the “Settings” or “Add Lights” section. Look for an option to “Add New Lights” or “Scan for Lights.”
Scan for Lights: Initiate the scanning process within the app. The app will search for nearby Philips Hue lights that are ready to connect via Bluetooth.
Pair the Lights: Once your lights are detected, select them from the list within the app. Follow the on-screen instructions to pair each light with your device. This process may involve confirming pairing requests and assigning names to each light.
Control Your Lights: Once paired, you should be able to control your Philips Hue lights directly from the app. Adjust brightness, color, and other settings to suit your preferences.
Optional: Set Up Rooms and Scenes: Organize your lights into rooms and create custom scenes for different ambiance settings within the app, if desired.

How many Philips Hue bulbs/products can I use with the eSense app?

We have successfully tested up to 9 products/bulbs (mixture of different type of bulbs, Hue Go and LightStripe). However, from 3 products and more the reaction time of the products/bulbs slows down significantly (Philips enables a maximum transfer speed of 100ms per signal and per bulb).

Especially if you use several bulbs, a short distance to the Philips Bridge, the bulbs and your smartphone or tablet becomes more relevant. See also the next question about this.

How far can the Philips Hue, the Hue Bridge and the smartphone or tablet be away?

Usually the range is between 30 and 100 meter, depending on the environment. The range is less with objects in between (for example a wall in between can decrease the range). Also, if the Hue Bridge and your modem should be in another floor level, it can influence the range.

However, the transmission of the signal by Philips is good enough so that there weren’t any problems with our tests in normal households with the signal. Just from 4 (and more) bulbs at the same time a recognizable lag can occur, see also the question above about this. A warning will be displayed in the app if you want to use more than 3 lamps at the same time.

Where can I buy the Philips Hue products?

We suggest one of the starter kits from Philips for the use with the eSense. This also contains a colored bulb (‘White and Color Ambience’): https://amzn.to/3uzSFx8

23. Magic Blue FAQ

I can no longer find the Magic Blue in the Mindfield Shop.

Unfortunately, the Magic Blue is no longer in production. We have extended the eSense app to enable the use of Philipps Hue smart bulbs, which can be controlled via Bluetooth.

How do I connect to the Magic Blue?

You connect to the Magic Blue from inside the eSense app. To connect to the Magic Blue, open the eSense app and follow these steps:

Choose the eSense sensor you want to use
Choose the ‘settings’ (cogwheel symbol)
Enable the ‘Smart bulb feedback’ and choose ‘Magic Blue’ as the bulb type
Tab on the ‘Choose A Bulb’ button and select the bulb from the list that you want to connect to
(You can also test the chosen bulb by tapping on the ‘Connection Test’ button. If the color of the bulb changes by this, the bulb is connected.)

After you have followed these steps, the app will remember the Magic Blue you have chosen (you usually don’t need to follow these steps again, unless you want to use another Magic Blue).

You should not pair the Magic Blue by the device generic Bluetooth® settings.
(Attention: If you pair your bulb that way, you won’t be able to find and select the Magic Blue from inside the eSense app. If you did so by accident, simply un-pair the Magic Blue from the generic Bluetooth® settings and follow the steps above).

What can I do, if connecting to Bluetooth® fails or the Magic Blue is not found?

Restart the Magic Blue (switch the switch of your lamp off and on again). Especially if the Magic Blue is already switched on more than 1 minute, the Magic Blue stops sending the Bluetooth® signal to connect. Restarting activates the signal again and the Magic Blue can be found.

Why can’t I find the device when scanning for Bluetooth® devices?

Check the light from the Magic Blue to make sure the Magic Blue is switched on. If there is metal around the Magic Blue (for example a lampshade around the Magic Blue), it could shield the Magic Blue and block the signal.

Make also sure that the Magic Blue is not connected to another phone or tablet already since the Magic Blue can just be connected to one phone or tablet at a time (see also next question).

How many Magic Blue bulbs can I control at the same time?

You can control one Magic Blue at the same time.

How far can the distance between Magic Blue and phone or tablet be?

Usually the range is 18 to 30 meters without any objects in between. It will be less with objects between the Magic Blue and your phone or tablet (for example a wall between the Magic Blue and the smartphone or tablet can decrease the range).

How can I reset the Magic Blue?

Just follow this video to do so:

24. Functions of the Mindfield eSense App

The eSense comes with the eSense app which you can load for free in the Google Play Store (Android) or Apple App Store (iOS).

It offers a wealth of features for effective biofeedback training in a modern design. Essential functions are: the display of measured values as a bar graph, an oscilloscope, feedback via video, music, sound, vibration, and smart bulbs (Magic Blue and Philips Hue). You receive a comprehensive evaluation after each measurement and can compare measurements with each other in the archive and export them as CSV files.

The app is available in English, German, Spanish, French, Italian, Portuguese, Ukrainian, Russian, Turkish, Dutch, Japanese and Chinese. The language is chosen automatically according to the set language of the smartphone or tablet.

Download Links

iOS: https://itunes.apple.com/us/app/mindfield-esense/id1141032160?mt=8

Android: https://play.google.com/store/apps/details?id=com.mindfield.boisystem.esense

25. General notes

If the text on your Android device is sometimes cut off the reason can be a larger font in the system settings (especially for Huawei). In the Android settings, there is usually a way to adjust the font size and display size. It’s best to set this to “standard” or “default”, otherwise it can cause problems with app.
For data files which you can load as own media into the eSense App, the general limitations by Android and iOS apply. We have successfully tested the following:
- Images: PNG and JPG (GIF can be loaded but isn’t animated)
- Audio: MP3, WMA and WAV (Android) and MP3, WAV and AAC (iOS)
- Videos: MOV, MP4, AVI and 3GP (Android) and MOV, MP4 and M4V (iOS)
- If your audios or videos are in other formats, you can easily convert the files on your PC. To do this, use a free tool like Any Video Converter: .
- Another tip: You can also directly download videos from Youtube and format them to the right format (MP4) with tools like .

In following the app is described in full details.

26. General view & Open Training

Portrait

Measurement duration
Current HRV amplitude
Regularity
Score
Current heartrate
minimum heartrate
Maximum heartrate
Difference between minimum and maximum
Display whether the value is rising or falling
HRV scale
Zoom for conductance scale
Current HRV amplitude
Start, pause and stop of the recording
Open Training
Procedures
Archive
Help
Settings

Landscape

Absolute decrease of measured values
Absolute increase of measured values
Current SRC pro Minute
% of SRC of session
Swipe the screen to the left or right to switch between this main view and the other views After the measurement, you can also switch to the pie charts.
Set marker

27. Breath Pacer

Breathe as the sphere expands. With growing ball breathe in, with shrinking ball breathe out. The coherence (here 68%) shows you how much your heartbeat follows the breathing, the higher the value, the better. 100% cannot be reached.

Once you are over 50%, there is a correlation between heart and breath. Try to get as high a value as possible and experiment with different breath time specifications.

28. Biofeedback Snake

You can also display the Biofeedback snake as an additional option. At the top left are appearing symbols which vary in color depending on the current measured value.

The symbols are either green (further positive direction),
yellow (slight negative direction),
orange (strong negative direction)
or red (very strong negative direction).

After 10 green symbols you will also be rewarded with a star and after 50 green symbols even with a shooting star. If the snake goes over the entire screen you will see the last 5 minutes.

29. Spectrogram

The spectrogram shows how often the respective RR intervals (also NN intervals, the distance between two heartbeats) occur. This provides information about the proportion of sympathetic and parasympathetic heartbeats.

The spectrogram shows frequency bands from 0.04 to 0.4 Hz. The number of RR intervals of each frequency band is counted and plotted on the spectrogram. The skin-colored range shows the low RR intervals (0.04 Hz – 0.15 Hz, sympathetic range) and the purple range shows the high RR intervals (0.15 Hz – 0.4 Hz, parasympathetic range). The spectrogram is calculated using a Fast Fourier Transformation (FFT).

Simply put, with this graph, you can see how even the RR intervals are. Optimally, you have only one (or a few) distinct peak(s) in the skin-colored area and only one (or a few) distinct peak(s) in the purple area. This indicates that your RR interval repeats regularly in both the low (sympathetic) and high (parasympathetic) frequency ranges without large deviations.

Further information on the RR interval (NN interval) and the significance of the low and high frequency ranges can be found under “Explanation of the individual measured values” in this manual.

30. Survey (optional)

If you have activated this option in the general settings, a small survey will appear immediately after each measurement. This allows you to archive measurements that are reproducible in the long term or to document a change in your measurements. (If you for example start to use the eSense while lying down instead of sitting down).

Your position during measurement
Choose between sitting, the “tailor’s seat” or yoga seat, standing or lying down.

How do you feel?
Here you can indicate your state of mind after the session. This gives you the opportunity to record your mood together with the measurement results over the long term.

Note function, optional
Here you can add a note to the measurement in the free text field. We recommend that you write down any special circumstances so that you can still classify measurements with a lot of stress or relaxation later.

31. Pie chart (after the measurement)

After the measurement (and optional questioning), in landscape format, a screen appears with a pie chart: The time in percent of the regularity of your HRV curve. In addition, additional values from the entire measurement are listed for you again.

At this point, you can also swipe the screen to the left or right to switch between the pie chart and the graph of the measurement.

**Tortendiagramm und Werte nach einer Messung**

32. Procedure Overview

Edit or delete procedure

To edit a procedure, simply swipe it to the left in the overview.

You can then tap the blue pen-symbol to edit the module.

If you want to copy the procedure, tap on the green copy-symbol. By touching the red trash symbol, you can delete the module.

33. Procedure editor

Procedure name
Here you can name your procedure with a suitable name (in this example, it is simply “test”).

Password (optional)
If you wish, you can protect your procedure with a password.

Decimal separator
Here you can activate/deactivate the survey (position, mood, notes) after each measurement.

Survey after recording
Here you can activate/deactivate the survey (position, mood, notes) after each measurement.

34. Add new module

In the procedure editor, select the “Modules” tab.

Add module to procedure
Click on this button to add another module.

Edit module
Move the module to the left and tap the blue pencil icon to name the module.
To edit a module, tap the gray pencil icon.
To delete a module, tap the red recycle bin icon.
To duplicate a module within the procedure, click on the yellow sharing icon.
To duplicate a module in another procedure, click on the black sharing icon and select the procedure from the following pop-up.

Module Type
You can choose between a text, a fixation cross, an image, a video, an audio file, an arrow, a bar graph, a smart bulb, an oscilloscope, a breath pacer or the biofeedback snake.

Module duration
Set how long the module shall last. To do this, simply move the slider to the left or right.

module color
Determine the color of the module in the procedure editor.

35. Overview of the modules

**Text module**
This module shows a text which you can edit.

**Picture module**
The picture module shows either a standard picture from the app or a picture from your gallery.

**Video module**
In the video module, you can choose either the standard video from the app or use your own video.

**Fixation cross module**
The cross changes its color depending on the conductance and provides direct biofeedback.

**Audio module**
The audio module is playing a relaxing song. You can choose your own music.

**Arrow module**
The arrow changes depending on relaxation and gives you direct biofeedback.

**Bar graph module**
The bar graph shows you your current value and gives you direct biofeedback.

**Picture module in landscape format**
The procedures can be displayed also in landscape format.

Breath Pacer module in landscape format
The bar indicates the breathing rhythm. When the bar goes up, inhale. As the bar goes down, exhale. You can also set holding phases between inhaling and exhaling.

Osciloscope Type Breath curve (Sphere)
The circle leads the breathing rhythm. When he expands, inhale. When the blue circle contracts, breathe out. You can also set holding phases between inhaling and exhaling.

Osciloscope Type Both
This is a combination of the graph to the left and the breathing aid to the right \. You can see the measured values while following the breathing aid.

Biofeedback Snake The Biofeedback Snake is also available as module.

Procedure in the archive
The colored background represents the SRC per minute (green = relaxed state / little SCR, yellow = excited state / medium SCR)

36. Creation of a procedure

1. Tap on the plus icon to create a new procedure.

2. Give the procedure a name (here “Example Procedure”).
You can simply accept all other default settings for this example.

3. Select the upper tab “Module” and tap on the button “Add module”.

4. Select a bar graph module and tap the check mark. Here, too, you can accept the default settings.

5. Then add an Oscilloscope and breath pacer module Here, too, you can accept the default settings.

6. Your procedure should now look like this.

7. If you want to change something at a later date on one of the modules, you can swipe the corresponding module to the left and tap on the blue pencil symbol. Otherwise you can now tap the tick at the top right.

8. Start the procedure by tapping the play button. Have fun!

37. Meditations

You can also choose one of our guided meditations as a procedure. The breathing meditation is already included in the eSense app.

We will also offer more meditations shortly as new free cloud procedures for users with account. The meditations thus offer you an easy way to train your awareness and attention and, at the same time, receive biofeedback.

38. Own media (photos, videos and audios)

You can use your own pictures in the picture module, your own videos in the video module or your own music or melodies in the audio module in the procedures.

Android usually enables this without any further problems. As long as you allow the eSense app to access your files on your device, you can upload them to the eSense app.

iOS is a bit more restrictive. As usual, you can use your pictures from your device in the iCloud for pictures and videos.

For audio files you need iTunes (or an alternative such as “CopyTrans Manager”). This is where your music or melody must be. You can find your music in iTunes (or CopyTrans Manager) under the tab “My Sound” and insert it into your procedures.

We have a detailed video at https://www.youtube.com/watch?v=A_CRbmBeBBc where we show all the steps.

On iOS the power saving mode must also be deactivated, otherwise the videos in the procedures cannot be played.

39. General settings

eSense Pulse Connection
Select the eSense Pulse you want to connect. You must perform this step before you can perform a measurement. With the connection test, you can test the connection and see the battery status.

Feedback direction
Select the direction in which you want the feedback to react to. It can respond either to an increase or decrease in the measured values.

Response time
The default setting is “Short,” which allows feedback to respond quickly to changes in readings. For longer measurements, we recommend “Medium” or “Long,” then the reaction time will be slightly delayed and the eSense will no longer react to every small change in the measured values.

Music Feedback
If the value moves in the unwanted direction (e.g. lower values), the music will become quieter or change its speed depending on the type of feedback you choose.

Music preview
Tap the Play button to listen to the selected song.

Choose Music
You can use the default or your own music.

Music feedback type
You can optionally choose between music start/stop, volume feedback or playback rate feedback. Note: For iOS are the options restricted.

Tone Feedback
In the background, you can hear sounds from other apps.

Choose tone type
You can choose between single or continuous tones.

Tactile Feedback
Your device will vibrate to provide feedback. Only smartphones support this feature, tablets do not have a vibration motor.

Tactile feedback direction
Decide whether decreasing (“Decrease”) or increasing (“Increase”) tactile feedback values should be considered a success.

Smart bulb feedback
The light bulb changes its color depending on the values.

Choose a bulb
Choose between Magic Blue, Magic Blue V2 or Phillips Hue.Connection test
With this option, the bulb changes color if the connection is successful.

Breath Pacer
If activated, a breathing aid is displayed during the measurement.

Use eSense Respiration
You can also measure your breathing at the same time as the eSense Respiration.

Breath pacer type
You can choose between line and sphere.

Enable audio tone
Tones can also be added as auditory breathing aids.

Inhale time / exhale time
Select the seconds for each inhalation breath and exhalation breath to display the breathing aid.
Hold before inhale / exhale
Select the seconds between inhalation and exhalation breaths.

background image
You can choose a background image for the breathing aid.

Inhale color / exhale color
Select the color for each inhalation and exhalation stroke of the bar or ball.

Video
Choice: In the dropdown menu, you can select from included videos and “Select your own video”. You can select your own videos from your device.

Video Feedback Type
Effects can be applied to the video as feedback. Sie können zwischen Start/Stop, Schärfe, Helligkeit und Sättigung wählen. You can choose between Start/Stop, Sharpness, Brightness and Saturation. In addition, the automatic or manual mode for selecting the upper and lower limits is then available for sharpness, brightness, and saturation. In between is then interpolated. “No feedback” is also possible, then the video is simply played.

General:

Session name
Enter the name of your session which will be displayed in the archive here.

Session time length
You can automatically time-limit normal measurements. They stop automatically after the set time.

Time length X-Axis
You can set the time displayed on the X-axis of the oscilloscope. We recommend 90 seconds.

Decimal separator
You can choose between comma or dot.

Survey after recording
Here you can activate/deactivate the survey (position, electrode type, mood, notes) after each measurement.

Markers
You can define markers by tapping the button. These are the markers you can set during a measurement. (See also ‘Set Marker’ in Landscape mode of the general view above).

Show tutorial
You can watch the tutorial again at any time from the first start of the app.

FFT resolution
Selectable are 128 samples, 256 and 512. By default, 256 is selected. The eSense Pulse has a 5 Hz sample rate, so 256 samples are about 52 seconds of data.

Window function for FFT
You can choose between Welch and Hanning, two common window functions, see Wikipedia for more details.

Chart settings
You can change the colors of the graph and the oscilloscope in the general view.

Chart axis color
You can change the color of the chart axis in the main view.

Chart line color
You can change the color of the chart line in the main view.

Oscilloscope background 1&2
You can change the background color of the oscilloscope in the main view.

Smoothing of oscilloscope curve
You can adjust the smoothing of the curve in the oscilloscope between 1 (hardly) and 10 (very strong).

Reset to standard colors
You can restore the default colors for the graph at any time.

Arrow raise / lower color
You can also disable the arrow in the main view.Show arrow
You can also disable the arrow in the main view.

Backup & Restore
You can export and import your procedures and measurements. More about this in our FAQ

Demo Mode
A saved measurement is played back automatically. A real sensor is not needed.

Real time streaming to eSense Web App
This allows you to stream the data live to the eSense Web App. More information in the Account and Cloud section.

40. In App Purchases

In-App Purchases
Additional to the option to use your own music or videos in the eSense App you can also purchase additional music or videos. We regularly extend the offer.

41. Archive (overview)

The app also contains an archive, in which you can save your measurements and export them as well. You can watch those in detail again, compare them to each other and export them individual or all together (as ZIP file).

Recordings
Here you can see your measurements listed. You can view a single measurement by tapping on it.

If you click on the clipboard symbol at the top right, you can mark one, several or all measurements. You can then export, analyze or delete the exported measurement (s).

On the filter symbol you can choose whether you want to sort the measurements by name, date, length in ascending or descending order.

If you want to delete a single measurement from this list, you can also tap on the trash can symbol to the right of the measurement.

Analyze
Here all measurements are listed according to the following factors:

Time, score, average of session HR, minimum HR, maximum HR, difference min/max HR, SDNN ms, RMSSD ms, NN50, pNN50 %, stress index, average RR ms, Average HR.

With this, you can recognize trends over time and over several measurements (if, for example, your % of SCR of Session decreases by regular training, you can see this here immediately).

42. Archive (single view)

Export data

Thanks to our export functions at the bottom of a recording, you can export the recordings in PDF or .csv format with all common apps (e.g. send via Messenger, WhatsApp, e-mail, etc.) or simply save them on your phone or in your cloud.

The data are exported as a.csv-file (comma separated values). This format can be opened with Microsoft Excel or Open Office Calc (for free).

If you like to work with Google, Google Sheets can be an alternative to Excel for you. You can open your exported .csv-files, visualize and access them via the cloud easily from several devices. Google Sheets has almost the same functions and interface as Excel.

Note: We have also summarized more detailed information on CSV export and processing your data in an extra article on streaming and analyzing eSense data.

Regularity in % of the HRV curve

You can see here also the Regularity of your measurement. This pie chart is the same as the one you see after the measurement. You can get more information about the regularity in the chapter ‘Explanation of the individual measured values’ in this manual.

eSense Pulse analysis
For the eSense Pulse, we have a detailed evaluation of the general HRV measurement values in the archive. The color range shows you where you lie in comparison to your age and gender group. Your individual values may differ, of course, and you may still be completely healthy. However, the evaluation serves as an initial orientation to better classify your values.

In Excel™ or Google Sheets™

Notice: If you open the .csv-file with Excel™ (or Google Sheets™) and your values make no sense, then there is usually a different set language in the eSense App and Excel™ and Sheets™.

Note: We have also summarized more detailed information on CSV export and processing your data in an extra article on streaming and analyzing eSense data.

43. Marker feature

You can also set markers while you make measurements. For example, if you have a regular biofeedback exercise which involves breathing calmly at a specific point, you can set a marker in that moment when you breathe calmly. Later in the exported data, you can see the moment where you had breathed calmly. The marker feature comes in handy when you are making longer measurements with several actions.

The markers can be displayed well in Excel:

**Exported measurement in Excel with markers**

44. Virtual Reality (VR) (f.i. Meta Quest 3)

All our eSense sensors and our eSense app also work with VR (virtual reality) glasses. The prerequisite for this is a USB-C adapter (our recommendation: https://amzn.to/40eCoLR), which we now recommend anyway and which you can also order directly from us in the store with an eSense.

The eSense app can be used as normal, with all its functions. After the one-time setup with SideQuest, no further special adjustments need to be made.

In particular, the graph of the measurement as well as the photos and videos of the biofeedback training can be viewed in impressive detail with the VR glasses.

We have created a video that shows the best way to use it:

45. Compatible Android and iOS devices

General

Note for all eSense:
We recommend using a tablet instead of a smartphone due to the better display.

If you don’t have a device yet and/or want to buy an extra device for the eSense, we recommend depending on your taste either

a Nokia G10 (https://amzn.to/3dg9Qx5), a Nokia G21 (https://amzn.to/3Qso3Fv), a Motorola Moto E40 (https://amzn.to/3bBl0fg), a Samsung Galaxy A13 (https://amzn.to/3JuDE5x), a Samsung Galaxy A23 5G (https://amzn.to/3Z2NIIP) or a Xiaomi Redmi 10 (https://amzn.to/3TF2EvY) as a cheap entry-level device if you prefer Android

a used iPad in good condition (from bsw. https://www.refurbed.de/c/ipads/ or https://www.rebuy.de/kaufen/apple-tablets) if you prefer iOS.

According to our research, these options offer enough power for the eSense app, will remain upgradeable to the upcoming Android and iOS versions for some time, and are still reasonably priced. The Android devices also still have a normal 3.5mm jack input and do not require an adapter for the eSense.

Starting from the iPad 10th generation (2022), the iPad Pro 3rd generation (2018), the iPad Air 4th generation (2020), and the iPad mini 6th generation (2021), iPads no longer have a 3.5mm headphone jack. From these models onward, you will need an adapter for the eSense. More information can be found in the general notice below under iOS.

iOS devices compatible with the eSense

All iOS devices from version 15 or higher, which are (in excerpts):
Apple® iPhone® 6S, iPhone® SE/SE 2, iPhone® 7/7+, iPhone® 8/8+, iPhone® X, iPhone® XR, iPhone® XS, iPhone® 11/11 Pro, iPhone® 12/12 Pro, iPhone® 13/13 Pro, iPhone® 14/14 Pro, iPhone® 15/15 Pro
Apple® iPad® 5th generation or newer, including all iPad Mini from 4th generation and iPad Air from 2nd generation or newer
Apple® iPad® Pro from 1st generation or newer

General note:
Some newer iOS devices without the classic 3.5mm headphone jack, but with a Lightning or USB-C port, also work perfectly with the eSense. For this, you’ll need either the original Apple USB-C adapter (https://amzn.to/41zD2Gd) or the original Apple Lightning to 3.5mm adapter (https://www.mediamarkt.de/de/product/_apple-mmx62zm-a-2179668.html) – which is optionally included with the eSense.

Alternatively, you can use any other adapter with a DAC chip. We recommend this adapter on Amazon: https://amzn.to/2SnAUA1.

We tested 11 alternative Lightning adapters from third-party vendors – only two of them worked. Therefore, we recommend either the original Apple Lightning adapter (https://www.mediamarkt.de/de/product/_apple-mmx62zm-a-2179668.html) or this compatible Lightning-to-3.5mm adapter, which we have successfully used with the eSense and also offer in our shop: Compatible Apple Lightning to 3.5mm adapter https://mindfield-shop.com/en/product/compatible-apple-lightning-to-3-5mm-adapter.

Additional note Siri:
Please note that Siri must NOT be activated if you want to perform a measurement with the eSense (this applies to all eSense sensors). A running measurement can otherwise be disturbed and your measurement values falsified. You must disable Siri YOURSELF (our app cannot do this automatically due to Apple’s settings).
To disable Siri go to Settings -> (General ->) Siri and disable Siri (exact steps may vary depending on iOS version).

Note for iOS devices and the eSense Pulse:
Your iOS device must support Bluetooth® 4.0 LE (sometimes referred to as Bluetooth® Low Energy or BLE ), which is supported from iOS 5 and up.

Note for iOS 7 and later and the eSense Respiration, Skin Response, and Temperature:
The eSense works through the microphone input. For iOS 7 and above, you must explicitly allow the eSense app to use the microphone input, otherwise the eSense will not work. During the installation you will be asked for this, you have to answer there with “Yes” or “Allow”. After installation, you can set this manually. Allow access to the microphone input in the system settings of your iOS device under Settings -> Privacy -> Microphone

**Lightning to 3.5mm headphone jack adapter (is included with every Apple device,**
**which no longer has a 3.5mm headphone jack, e.g. the iPhone X)**

Android devices that are compatible with the eSense

All Android smartphones and tablets running Android 10.0 or later (Android Q)
If you plan to purchase a device specifically for use with the eSense, then we recommend a Nokia G10 (https://amzn.to/3dg9Qx5), a Nokia G21 (https://amzn.to/3Qso3Fv), a Motorola Moto E40 (https://amzn.to/3bBl0fg), a Samsung Galaxy A13 (https://amzn.to/3JuDE5x), a Samsung Galaxy A23 5G (https://amzn.to/3Z2NIIP) or a Xiaomi Redmi 10 (https://amzn.to/3TF2EvY) as an inexpensive entry-level device.

Important note about Android devices for the eSense Pulse:
Your Android device must support Bluetooth® 4.0 LE (sometimes called Bluetooth® Low Energy or BLE ), which is supported from Android version 4.3 (mid-2013). But we recommend Android version 4.4 and higher anyway. Therefore, the eSense Pulse generally works with most current Android devices.

Important note about Android devices for the eSense Respiration, Skin Response and Temperature:
Your Android device needs a 3.5 mm connector (standard headphones) for external headsets/microphones. On most devices this is present and often integrated with the headphone jack. If no such microphone input is present, such as on the Google Nexus 7, you cannot use the eSense! (All iOS devices listed above have the port).

Alternatively, you can use any other adapter with a DAC chip. We recommend this adapter on Amazon: https://amzn.to/2SnAUA1.

Below are some Android devices that we have tested with the eSense Pulse, Respiration, Skin Response and Temperature and which work fine (whitelist). (Please note that this is only a very small sample and that the vast majority of devices worldwide work with the Mindfield eSense).

Google Pixel 2 (Smartphone)
Samsung Galaxy A13 (https://amzn.to/3JuDE5x) (Smartphone, our recommendation)
Samsung Galaxy A23 5G (https://amzn.to/3Z2NIIP) (Smartphone, our recommendation)
Samsung Galaxy S21 (Smartphone)
Motorola Moto E40 (https://amzn.to/3bBl0fg) (Smartphone, our recommendation)
Nokia G10 (https://amzn.to/3dg9Qx5) (smartphone, our recommendation)
Nokia G21 (https://amzn.to/3Qso3Fv) (smartphone, our recommendation)
Xiaomi Redmi 10 (https://amzn.to/3TF2EvY) (smartphone, our recommendation)
Xiaomi Redmi Note 11s (smartphone)
Samsung Galaxy Tab S8 (tablet)
TECLAST M50 (https://amzn.to/464c0pr) (tablet, low price but needs the USB-C-to-3.5-mm jack adapter: https://amzn.to/2SnAUA1)

The following Android devices are NOT compatible with eSense Respiration, Skin Response and Temperature (blacklist). This list is not necessarily exhaustive. If you are not sure if your device is compatible, check if the microphone input is present as described above!

All tablets from Lenovo (For the eSense Skin Response, Temperature and Respiration. The microphone input distorts the signal from the eSense. With the eSense Pulse they work)
Samsung Galaxy A40 (Problems with the signal level of the eSense Skin Response and Temperature. Only the Respiration works. Pulse also works because it does not require a 3.5mm jack)

It is possible that these devices will work after all if you use the devices’ USB-C port instead. You can use a USB-C to 3.5 mm jack adapter for this purpose: https://amzn.to/2SnAUA1.

46. eSense Web App

In addition to the app, we have also developed an eSense web app that mirrors and supplements the app. You can use this with the account and plans mentioned above.

You can analyze your recorded data (with the basic plan) or even transfer your data to a PC in real time (live streaming with the premium plan).

The main advantage of this is that you can see the graph even better with a large screen and enlarge individual areas and have more advanced analyze features.

**eSense Web App with a live measurement with the eSense Pulse**

**eSense Web App with a live measurement with the eSense Muscle**

With the eSense Web App, you can also view measurements from several and different eSense simultaneously and in real time, which allows a professional trainer client to design the workflow.

You can find the web app at https://esense.live. There you can login with the same account (username and password) as for the eSense app. For more information on the eSense Web App and its capabilities, see also our article on streaming eSense data.

**Archive of the eSense Muscle in the eSense Web App**

The eSense app works with all our eSense except the eSense EEGenius.

47. Supervisor Guide

You must have activated a plan. You can book this in our mobile app (on Android and iOS), under Profile -> Plans.

For sharing your measurments with a supervisor as client, the Basic Plan is sufficient (because the measurements are already uploaded to the cloud, so your supervisor can access your uploaded measurements). We also have an overview of different trainer-client scenarios here: https://mindfield.de/esense-app-fur-den-professionellen-anwender/

For the live streaming and custom live view, the client needs to have the Premium plan activated.

Client side

Next you need to login to our Web App at https://esense.live/

In order to share your measurements with a supervisor you need to have the Basic plan activated (as described in the first step above)

In the web app, you must enter the ID of your supervisor (with whom you want to share your measurements). For data protection reasons, this is unfortunately only possible in this way. This means that your desired supervisor must provide you with the ID and you must enter it in the following place and thus allow the supervisor access:

(For privacy reasons, supervisor mediators are now shown with their initials only. The e-mail is no longer displayed, only the ID).

Trainer side

First you need to login to our Web App at https://esense.live/

You must be a registered Supervisor. You can buy the Supervisor Plan here:

In order to work with your client(s), the client(s) needs to

have the Basic plan
Be a supervisor yourself

If you want to use the live streaming together with clients, the clients also need a stable internet connection.

You can add clients by selecting them from the drop-down list. As the clients have previously explicitly granted you access, you should see your clients in the drop-down list.

Activate streaming to esense.live in the eSense mobile app

If you are a supervisor, you can activate real-time data transmission to eSense Web App (esense.live) in the eSense app settings.

Custom Live View (Live Streaming)

For the custom live view and live streaming, you need to have the Premium Plan activated (as described in the first step above).

Klick on “Charts” -> “Custom live view” in the menu. Select the client from the drop-down menu, select the Sensor at “Type” and click on “Add custom Chart”.

Custom live view with 1 client and 2 sensors

You can do this with several different sensors from the same user as well as see the measurements from several users at the same time.

You could for example stream the Skin Response and Pulse from one client when the client does a combined measurement with the Skin Response and Pulse.

But you also could have 2 or more clients all using an eSense Pulse at the same time and stream them next to each other (f.i. in a group session that you do online with several clients in different places)

48. Account and Cloud

You can register your own, free account for the eSense app and book plans. You can also benefit from free, regularly added procedures without booking a plan. Thus, we recommend using the app with an account. With the plans you can mainly use the cloud and its functions and get also access to the eSense web app at https://esense.live.

With the Basic Plan, you can save your measurements locally and online in the cloud and thus access your measurements from all devices and from anywhere. You also get access to the eSense web app.

The Premium Plan includes all functions of the Basis Plan. In addition to your measurements, you can also save your custom procedures online in the cloud and thus access your procedures from all devices. (Attention: Technical limitations from Apple unfortunately do not allow the upload (and thus the synchronization) of audio files. The synchronization of picture and video files is possible, however). You can buy the Premium Plan here: https://mindfield-shop.com/en/product/premium-plan-for-esense-app-for-all-esense-sensors-annually/

There is also the Supervisor Plan. As a professional or commercial biofeedback trainer, you can use it to create individual procedures for your clients and share them with them via the cloud. You can buy the Supervisor Plan here: https://mindfield-shop.com/en/product/esense-supervisor-account-monthly-subscription-for-esense-app-and-esense-live

You can also share your measurements with other users. You also have the option of transferring your data to the eSense web app in real time. To do this, activate “Real-time data transfer to eSense Web App” at the bottom of the settings.

These plans can be used, among other things, to design a trainer’s client’s workflow. You can find an overview of the account and the cloud in our account comparison article.

You can book the plans in our app in the profile tab:

49. Account Comparison

Note: Scroll the table left or right on mobile devices

ACCOUNT TYPE:	SUPERVISOR	PREMIUM PLAN	BASIS PLAN	WITHOUT PLAN
Download of a procedure from the cloud	✅	✅	✅	✅
Upload of a procedure to the cloud	✅	✅ ₁₎	❌	❌
Upload of a measurement to the cloud	✅	✅	✅	❌
Upload of a procedure (as record) to the cloud	✅	✅	✅	❌
Sharing of a procedure (over the cloud)	✅₂₎	❌	❌	❌
Sharing of a procedure (as record)	✅ ₃₎	✅ ₃₎	❌	❌
Sharing of a measurement (as record)	✅ ₃₎	✅ ₃₎	❌	❌
Join a group	✅	✅	✅	✅
Create a group	✅	❌	❌	❌
Add other users to a group	✅	❌	❌	❌
Stream data to the eSense dashboard	✅	✅	❌	❌

1) Sharing with other users or groups not possible
2) Sharing with other users or groups possible
3) Sharing with other users possible

Example cases for the different accounts

SUPERVISOR

The professional or commercial biofeedback trainer has a SUPERVISOR account so that he can create individual procedures for his clients and share them with them via the cloud. They can also create different groups and add their clients to them individually. This allows them to monitor and analyze their clients’ measurements over a longer period of time.

You can buy the Supervisor Plan here: https://mindfield-shop.com/en/product/esense-supervisor-account-monthly-subscription-for-esense-app-and-esense-live/

PREMIUM PLAN

The client who wants to work with a (professional) trainer and have access to all functions has a PREMIUM PLAN. This allows the client to share their recordings (both free measurements and procedures) with the trainer and other users. They can also upload their own procedures to the cloud and have them analyzed or adapted by the SUPERVISOR (trainer).

BASIS PLAN

The client who wants to work with a (professional) trainer needs at least this account so that he can share his recordings with the trainer (SUPERVISOR).

WITHOUT PLAN

Anyone who simply wants to get a taste of the app does not need to join a plan to test its functionality.

Example cases for the synchronization of measurements between accounts with different plans

Without account, without plan (and offline)

All measurements are saved locally on the device. There is no synchronization with the cloud as there is no associated account.

Users can only access their measurements on the device on which they were carried out. You can find the measurements in the archive under the Recordings tab.

With account, without plan

The measurements are linked to the user’s account but are not synchronized with the cloud. All measurements that are linked to the user’s account are displayed in the archive.

The measurements can only be accessed if the user is logged into the account on the device on which the measurements were taken. You can find the measurements in the archive under the Recordings tab.

With account, with basic or premium plan

All measurements are linked to the user’s account and are synchronized with the cloud.

All synchronized measurements that are linked to the user’s account are displayed in the archive. To synchronize old measurements that were created on the device before a plan was purchased with the cloud, you can select the “Synchronize with the cloud” button in the “Local session, performed without account” tab in the archive. These measurements are then assigned to the other measurements and disappear from this tab.

Activate streaming to esense.live in the eSense mobile app

If you are a supervisor, you can activate real-time data transmission to eSense Web App (esense.live) in the eSense app settings.

50. Groups

The accounts enable you to create your own groups or to join other groups. This allows you to share your recordings with your friends. Or you can work with a trainer as a client since you can share your recordings with the trainer.

Create a group

Tap on the plus symbol to create a group.

Edit a group

Tap on the 3 dots next to the group name You can then (if authorized) view and remove the members of the group or add new members.
You can also change the title of the group or delete the group.

51. Privacy policy

The eSense App does not collect any personal data, such as name, gender, date of birth, etc.. Each recording of measurement data is done under a general prefix such as “measurement”,

supplemented by with the eSense sensor used, the current date and time of the measurement. The recorded measurement data cannot therefore be assigned to any person.

The prefix of a recording, e.g. “measurement”, can be changed by the user in the settings and used for the assignment to a person. Users can decide whether to change this prefix to their name, for example. Then each measurement and also each CSV file exported from it contains the name of the user in the file name.

Access rights within the eSense App

Microphone input: Access to the microphone input is required to receive measurement data from the eSense sensor at all. This access is mandatory.

Access to media library: Access to photos, music, and videos is only required if you want to use your own photos, music, and/or videos in the eSense App. The eSense app should be used as feedback. It is also possible to use only the by the app supplied media.

Access to the location: The access to the location (activation of GPS) is only required for the Bluetooth® connection to the Magic Blue bulb (optionally available) or the eSense Pulse. This is mandatory under Android and lies outside the possibilities of the publisher of the eSense App. No standard data is collected, the standard function is not used.

Access to Bluetooth®: If the eSense app is used with the Magic Blue smart bulb to provide biofeedback by modifying the color and brightness of the light bulb, it needs to be connected via Bluetooth® within the app. To do this, the Bluetooth® function is used. For the eSense Pulse Sensor, Bluetooth® is also required as it transmits the data via Bluetooth®.

Transmission of anonymous usage data and crash reports

In order to improve the technical stability of the eSense App and the detection of code errors, we use the Sentry service. Sentry serves these purposes alone and does not evaluate any data for advertising purposes. The transmission takes place anonymously and only with an existing internet connection.

Processed data

Usage data, metadata (device ID, device data, IP address).

Special protective measures: IP masking, immediate deletion.

External Functional Software Disclosure: Functional Software Inc., Sentry, 132 Hawthorne Street, San Francisco, California 94107, USA.

Processing in third countries: USA

Warranty for processing in third countries: Privacy Shield, https://www.privacyshield.gov/participant?id=a2zt0000000TNDzAAO&status=Active.

Deletion of the data: Information on the device or time of error is collected anonymously and is not used for personal purposes and then deleted.

Medical information

The Mindfield eSense sensors are not medical devices and may therefore only be used to reduce stress.

If you suffer from an illness, do not carry out any treatment on your own and always consult a therapist.

Warranty by the manufacturer The statutory warranty obligations apply to all our products. If you have any problems with our products, please contact us directly. See the “Contact” section of this manual.

eSense Pulse Manual

© Mindfield Biosystems Ltd. 2025 | www.mindfield.de

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