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An LED is a light-emitting diode. Lighting an LED is considered the "Hello world" of a circuit design, and it can be as simple as using a series resistor, or it can get more complicated, involving PWM and multiplexing.

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Lilypad Mini ProtoSnap

Leds which have a 150 ohm resistor per LED. … So far i know that each pin has a maximum current of 40mA and each LED has a max current of 20mA. …
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