ble-heart-rate-reader

Simple helper for reading heart rate and rr interval data received from a bluetooth low energy heart rate monitoring device.

This was developed on Mac OS High Sierra and tested with a Polar H7 device. Other devices using the same standards for Heart Rate Characteristics might also work.

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Example:

// import + create instance
var BleHeartRateReader = require('../lib');
var hrm = new BleHeartRateReader();

// listen for connection
hrm.on('connection', function(peripheral) {
  console.log('device connected');
});

// listen for heart rate data
hrm.on('data', function(data) {
  console.log(data.hr); // heart rate
  console.log(data.rrs); // array of rr intervals in seconds
});

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Notes

This module makes use of the noble library to access bluetooth characteristics. More specifically, a specific version of it was used to support Mac OS High Sierra. If you implement this modue on other systems, you can probably use the official master branch.

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