This fork takes the functionality of the original and modifies it:

1. The application is changed to a windowed application
2. The heart rate measurement service fields are completely recorded
3. Logging of the heart rate service data to a csv file occurs automatically upon connection.

This has been tested with a Polar H7 and a Polar H10

A lightweight program to display the heart rate reading from a Bluetooth Low Energy device.

This has only been tested on a Polar H7 (non-referral link) but others should work.

Requires Windows 8.1 or newer.

The executable and code are released under MIT license.

I owned a Polar H7 I could not get to work with any iOS software for use in the gym. I decided to repurpose it as a way to read my heartrate while I worked on my computer. Having found no software, I decided to create my own.

The program's secondary purpose is for Twitch streamers, because having looked into their setups, I found there was a mixture of excessive hardware and software needed. I am not a Twitch streamer and am willing to add the customizations needed by request.

Some builds of Windows 10 have bug related to security which causes Desktop apps to stop receiving notification callbacks from GATT characteristics after receiving a few initial callbacks. One may find more details in this post: https://social.msdn.microsoft.com/Forums/en-US/58da3fdb-a0e1-4161-8af3-778b6839f4e1/ or in similar posts on social.msdn.microsoft.com.

There are several workarounds, the simplest being creating an AppId for the app in the Windows Registry and adding a security setting for the AppId, like below:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID{C6BFD646-3DF0-4DE5-B7AF-5FFFACB844A5}] "AccessPermission"=hex:01,00,04,80,9c,00,00,00,ac,00,00,00,00,00,00,00,14,00,
00,00,02,00,88,00,06,00,00,00,00,00,14,00,07,00,00,00,01,01,00,00,00,00,00,
05,0a,00,00,00,00,00,14,00,03,00,00,00,01,01,00,00,00,00,00,05,12,00,00,00,
00,00,18,00,07,00,00,00,01,02,00,00,00,00,00,05,20,00,00,00,20,02,00,00,00,
00,18,00,03,00,00,00,01,02,00,00,00,00,00,0f,02,00,00,00,01,00,00,00,00,00,
14,00,03,00,00,00,01,01,00,00,00,00,00,05,13,00,00,00,00,00,14,00,03,00,00,
00,01,01,00,00,00,00,00,05,14,00,00,00,01,02,00,00,00,00,00,05,20,00,00,00,
20,02,00,00,01,02,00,00,00,00,00,05,20,00,00,00,20,02,00,00

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID\YOURAPP.exe] "AppID"="{C6BFD646-3DF0-4DE5-B7AF-5FFFACB844A5}"

1. Connect appropriate bluetooth device inside Window's bluetooth settings.
2. Download prebuilt binaries or build from source.
3. Run HeartRate.exe

I do not have the time to turn this into production grade software but I am willing to expand it to your needs. At startup, the program searches for an appropriate device and attempts to register a notification event for heart_rate_measurement. If this fails, the error is likely vague and not overly helpful. If you believe your device should work with this software but does not, please open a github issue with specifics.

This will not work for any general USB/bluetooth heart rate monitor. It has to be a Bluetooth Low Energy device supporting heart_rate_measurement.

By default, only an icon in the system tray is displayed. When the heart rate goes over an alert threshold, a balloon notification shows.

Clicking the system tray icon reveals a window with scaling text. This is for Twitch streamers to be able to region for broadcast.

Right clicking the system tray icon gives the option to edit an XML settings file. When the editor is closed, the settings will be reloaded automatically. The file is %appdata%\HeartRate\settings.xml

color values are formatted as 32bit ARGB hex values. Leading 0's are optional.