LEDs (Light-emitting diode) can be found on many collors and sizes.
This example shows the simplest thing you can do with an Arduino to see physical output: it blinks an LED!
In this tutorial you will also learn how to use pinMode(), digitalWrite() and delay() functions.
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Wearables — Etching a stencil
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Biohacking — Token – A Wearable Ring with NFC & Bluetooth
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