Arduino Defined Arduino is described by its makers as “ an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software,” whatever that means.

You can read the state of a button using Arduino and a few lines of code. The actual state is shown in the Serial Monitor window as 0 or 1, 0 meaning the ...

DIY musical instruments are their own thing entirely, but if you're looking for a place to start, Adafruit has a guide to building your own MIDI controller using an Arduino.