If you want to add a keypad to your Arduino project, the options are pretty limited. There’s that red and blue 4×4 membrane we’ve all seen in password-protected door lock projects,… ...

An arduino uno based 4-voice polyphony synth controlled by a keyboard. 31.25 kHz sample rate, 16 instruments (one of which is just for fun, implying others are of much use). Sound synthesized with ...