Log heart rate from a Polar H7 using node

A rudamentary example of using Noble to listen to heart rate data from a Polar H7 bluetooth heart rate sensor.

index.js is pretty short and thoroughly commented. The code is pretty naive, it just finds the first bluetooth peripheral transmitting the bluetooth heart rate service and listens for the measurement data.

How to use this

• Install node
• Clone this repo
• In the root directory, run npm install to install noble
• While wearing the Polar H7, run node index.js
• After a few seconds, you should see heart rate data logged into the terminal

Notes

This should function with other bluetooth heart rate sensors that broadcast the 180d service. This does not include Fitbit Charge HR - to my knowledge the Charge HR does not broadcast the heart rate service over bluetooth.

Resources

Some good resources for more on listening to bluetooth heart rate:

Introduction to Core Bluetooth: Building a Heart Rate Monitor

Mac Developer Library: CoreBluetooth Heart Rate Monitor