Quantity   Component name
1 × ATmega48 TQFP32 https://www.digikey.com/product-detail/en/microchip-technology/ATMEGA48-15AT/1611-ATMEGA48-15ATCT-ND/6832223
18 × Red LED, diffuse, 0603 https://www.digikey.com/product-detail/en/rohm-semiconductor/SML-D12U1WT86/SML-D12U1WT86CT-ND/5843858
4 × Blue LED, diffuse, 0603 https://www.digikey.com/product-detail/en/osram-opto-semiconductors-inc/LB-Q39E-N1OO-35-1/475-2815-1-ND/2176354
2 × 39 Ohm resistor network, 1506 https://www.digikey.com/product-detail/en/panasonic-electronic-components/EXB-2HV390JV/Y1390CT-ND/285364
1 × 15 Ohm resistor network, 1206 https://www.digikey.com/product-detail/en/panasonic-electronic-components/EXB-38V150JV/Y9150CT-ND/256570
2 × 4k7 pull-down resistor, 0603 https://www.digikey.com/product-detail/en/bourns-inc/CR0603-JW-472ELF/CR0603-JW-472ELFCT-ND/3592926
2 × 0.1 uF decoupling capacitor, 0603 https://www.digikey.com/product-detail/en/yageo/CC0603ZRY5V9BB104/311-1343-1-ND/2103127
2 × Momentary push switch https://www.digikey.com/product-detail/en/c-k/PTS645SK50SMTR92-LFS/CKN9087CT-ND/1146813
1 × CR2032 battery holder https://www.digikey.com/product-detail/en/linx-technologies-inc/BAT-HLD-001/BAT-HLD-001-ND/1577235