Full instructions are here: https://www.instructables.com/id/Quick-Fruit-Piano/ Requires the ADCTouchSensor no-component capacitive touch library: https://github.com/arpruss/ADCTouchSensor Attach A0-A7 to pads, fruit, cans, etc. Turn on Arduino with sketch. Wait for the LED to turn off. Then run: python piano.py com-port on a connected computer to get polyphonic sound. (Make sure you have pygame installed. If not, python -m pip install pygame) The Arduino sketch sends MIDI format stuff, so you can also use Hairless MIDI on the computer.