Quantity   Component name
1 × ATmega328p Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
17 × 3mm blue LED Kingbright L-7104-QBC-G
17 × 5.6k Ohm resistor
3 × 10kOhm resistor for pull-ups
1 × 16000kHz crystal
2 × 22pF capacitor for the crystal
1 × Push-button
1 × Rotary encoder reclycled from a mouse
1 × 100nF capacitor Probably not necessary