Notes for parts

ATSAMD11C14 vs ATMega32U4?

Both native USB

ATSAMD11C14 (32 bit): less pins, low memory, faster, easier to solder, need J-link to program
J-link https://www.digikey.com/product-detail/en/segger-microcontroller-systems/8-08-91-J-LINK-EDU-MINI/899-1061-ND/7387472

ATMega32U4: more pins, higher memory, slower, difficult to solder, directly program
Bigger pins ATMega https://www.digikey.com/product-detail/en/microchip-technology/ATMEGA32U4RC-AUR/ATMEGA32U4RC-AURCT-ND/2774248

Other parts and lead free solder @digikey

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