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.
Imagine our surprise when Apple introduced it first in its Beats line! It’s a real feat of engineering to miniaturize an optical heart rate sensor to fit in earbuds this small, and Beats made a ...
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