He wanted to do a little more with the equipment so he ditched the watch and built an Arduino-based heart rate monitor ... pulse an output pin with each beat of the heart. [Wolf] used the D2 ...
Inside, an Arduino Nano is hooked up to a series of WS2812b LEDs. The LEDs are flashed in time with the heartbeat of the person holding the heart, thanks to a MAX30102 heartbeat sensor.
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