Step 1: Parts and Material
• An Arduino (or Arduino-compatible) microcontroller board.
• Any Arduino board should work: Uno, Leonardo, Mega, Pro Mini, etc.
• Eight 2.2 Megaohm (2.2 MΩ) resistors
• Anywhere between 1 MΩ and 4.7 MΩ should work
• You need one resistor per piano key
• A 2.2 MΩ resistor has a color code of Red-Red-Green or Red-Red-Black-Yellow
• A piezo buzzer
• Some spare wires or jumper cables
• Aluminum foil
• A foot or two should do
• A surface to tape your keys to
• We used a scrap piece of cardboard, but it can be anything you like, even the tabletop itself!
Equipment that you may need:
• Soldering iron and solder
• You can probably get by without an iron by wrapping wires together instead of soldering, but the connection will not be as reliable
• Scissors to cut aluminum foil and tape