Quantity   Component name
1 × ATMEGA328P Must be _P_ variant! Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
1 × IR Led 5mm
1 × 4MHz Crystal
2 × 22pF 0805 SMT Capacitor
2 × 100nF 1206 SMT Capacitor
1 × 10K 1206 SMT Resistor
1 × 47R 1206 SMT Resistor (Might be better to be larger as this pushes the ATMEGA a bit hard)
19 × Push Button SMT Version