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In Super Awesome Sylvia’s latest video, she walks through a build for an Arduino-powered Pulse Sensor pendant necklace. The sensor attaches to your ear and is connected to a pendant around your neck. The LEDs on the pendant blink in pace with your heart. In addition to step-by-step directions for the project, Sylvia offers a short lesson in cardiology 101.

For this project you’ll need:

Have a look: