Checkoutmyworkout-heart-rate-monitor NPM

checkoutmyworkout-heart-rate-monitor

Javascript library to read heart rate from bluetooth devices. This library is a simple one, built on the fine work at https://github.com/Polidea/react-native-ble-plx.

Getting Started

These instructions will get you up and running with the checkoutmyworkout-heart-rate-monitor library. There is a working sample if you would like to start by cloning a working repository.

Prerequisites

Node.js
React Native
react-native-ble-plx (be sure to have the right settings for your profile to be given Bluetooth permissions for your app)
An actual Bluetooth heart rate monitor. We have tested with the Scosche RHYTHM+ and the Polar H10.

Installing

After you have the above prerequisites, you just need to install the checkoutmyworkout-heart-rate-monitor library:

npm install checkoutmyworkout-heart-rate-monitor

Then use it in your code:

import { HeartRateMonitor } from 'checkoutmyworkout-heart-rate-monitor';
...
HeartRateMonitor hrm = new HeartRateMonitor();

hrm.startHeartRateDevicesScan( (device, error) => {
  if (error) {
    hrm.stopHeartRateDevicesScan(); 
    console.log(`error scanning for heart rate devices: ${JSON.stringify(error)}`)
  }
  else {
    // In a real app you would probably not just take the first one,
    // you would probably add all the devices scanned to a list and let
    // your user choose.  However, for clarity, we'll just take the first
    // device and its ID here. You also wouldn't stop the monitor right 
    // away, but again, we do so for clarity in illustrating how to use 
    // the code.
    hrm.stopHeartRateDevicesScan();
    hrm.startHeartRateMonitor(device.id, (result) => {
      console.log(`result.heartRate=${result.heartRate}`);
      hrm.stopHeartRateMonitor(device.id);
    });
  }
});