He wanted to do a little more with the equipment so he ditched the watch and built an Arduino-based heart rate monitor ... the D2 pin of an Arduino Uno to connect to the receiver because this ...

Case in point is a heart-monitoring IC that’s so brand new ... and even detecting the pulse rate. Using the chip is simple: you plug in two electrodes on one end, and you get the waveform ...

You may be interested in a project published to the Hackster.io website earlier this year providing instructions on how to create a simple wearable heart rate monitor using an Arduino Nano R3.