broadcast the data of the HRM sensor

Posted on Mon 23rd, August 2021

• #1

uname

How can I broadcast the data of the HRM sensor so that they can be managed with external apps? (in my case oruxmap)

Thanks.

Matteo.
• #2

Robin

Mon 2021.08.23

Hi Matteo, there are 24 tutorial examples at:

http://www.espruino.com/Tutorials

Start with:

http://www.espruino.com/About+Bluetooth+LE
http://www.espruino.com/Quick+Start+BLE
• #3

uname

sorry, i had only searched here on the forum and had not considered the tutorials, my fault.

Thanks.
• #4

Gordon
Hi,

The easy way to do it is simply to have this code on the Bangle:
```
Bangle.setHRMPower(1);
Bangle.on('HRM',function(e) {
  NRF.setAdvertising({},{manufacturer: 0x0590, manufacturerData:[e.bpm]});   
});
```
That'll advertise the current BPM as one byte in a custom UUID (the one reserved for Espruino's use).

More info at http://www.espruino.com/BLE+Advertising and http://www.espruino.com/Reference#l_Bangle_HRM for the HRM event

However there is actually a standard HRM bluetooth service that can be implemented - Adafruit have an example at: https://learn.adafruit.com/bluefruit-nrf52-feather-learning-guide/custom-hrm

So potentially that could be implemented (using NRF.setServices), and it might work out of the box with some apps. If you need more help doing that I could post something up
• #5

uname

Thank you for your answer, I won't hesitate to ask if I need it!

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