Quantity   Component name
1 × Microchip ATMEGA32U4-MU QFN-44 AVR microcontroller w/ USB
1 × 16-MHz SMD-3225 crystal
2 × 0.1μF 0603 capacitor
2 × 22pF 0603 capacitor
1 × 1μF 0603 capacitor
2 × 22Ω 0603 resistor
1 × 10kΩ 0603 resistor
4 × Keystone 5134 tactile dome switch