Quantity   Component name
1 × Arduino Pro Micro
1 × Shift Register 75HC595
1 × Hookup wire
1 × Paper and printer For labels on keys
1 × Black satin spray paint
1 × Shellac and primer spray paint
1 × Soldering Prototype Copper PCB Printed Circuit Board
8 × Pulldown resistors 10k or similar
1 × Potentiometer For controlling the piezo volume
1 × Piezo buzzer For playing little tunes
1 × Keypad from cash register
1 × MDF Board 1/8"
1 × Pin headers For Arduino Pro Micro
1 × Micro USB cable