Quantity   Component name
1 × atmega88 Microprocessors, Microcontrollers, DSPs / Microcontrollers (MCUs)
2 × 3.6V zener diodes
3 × button
1 × potentiometer
4 × 3mm leds
5 × 2.2K Ohm resitor
1 × 100K Ohm resistor
2 × 22pF capacitor
1 × 100n capacitor
1 × 20 MHz crystal
1 × USB connector (B)