[Kevin Fodor] shares his method of reading multiple inputs on one pin of a microcontroller. The analog to digital convert function of the microcontroller is used to read a potentiometer but with so… ...

It’s worth noting that the actual USB interface is being done with a stand-alone controller, so the Arduino here is being used purely to drive the lighting effects.

Sometimes I still have to change inputs on the monitor, but the monitor will auto-switch to a different input when the existing active input goes to sleep.