You can fade out and fade in the light of an LED automatically by using Arduino and a simple code that is described below. Even though the Arduino board cannot output variable voltage on its digital ...

input PWM signal to counteract the natural exponential nature of the LED to make the LED look like it’s fading linearly. With trial and error, he found the most pleasing input curve to use can be ...

He builds a simple dead bug Arduino (which he calls an Audioino) using a handful of resistors, a pair of caps, an LED, a reset switch, and most importantly – an audio jack.