KeyPad-PCB
4 Mechanical key switch PCB using ATMEGA32U4 Microchip.
Components used:
ATMEGA32U4:
https://www.digikey.ca/en/products/detail/microchip-technology/ATMEGA32U4-AUR/2238241
FA-238 Crystal: https://www.digikey.ca/en/products/detail/epson/FA-238-16-0000MB-C3/2403378
Diodes: https://www.digikey.ca/en/products/detail/micro-commercial-co/1N4148W-TP/717196
Button: https://www.digikey.ca/en/products/detail/e-switch/TL3342F160QG-TR/379003
22 Ohm Resistors: https://www.digikey.ca/en/products/detail/stackpole-electronics-inc/RMCF0805JT22R0/1757897
10k Ohm Resistors: https://www.digikey.ca/en/products/detail/stackpole-electronics-inc/RMCF0805JT10K0/1757762
22pF Capacitors: https://www.digikey.ca/en/products/detail/kemet/C0805C220J5GAC7800/411112
0.1uF Capacitors: https://www.digikey.ca/en/products/detail/yageo/CC0805ZRY5V9BB104/2103099
1uF Capacitors: https://www.digikey.ca/en/products/detail/yageo/CC0805KKX7R7BB105/2103103
4.7uF Capacitors: https://www.digikey.ca/en/products/detail/kyocera-avx/08055D475KAT2A/13557255
Mini USB Connector: https://www.digikey.ca/en/products/detail/hirose-electric-co-ltd/UX60SC-MB-5S8/1949202