Quantity   Component name
1 × Arduino Almost any will do (for now)
2 × Film Canister Caps Or similar
2 × Infrared LEDs We took ours from QRD1114s
2 × Opto-Transistors We took ours from QRD1114s
2 × 33K Ohm resistors This value may change depending on what components you use
2 × 330 Ohm resistors This value may change depending on what components you use
1 × Speaker We used an 8 ohm speaker
1 × Rubber glove for membrane A balloon should work too
1 × Headers and wires to connect everything You'll want a soldering iron too