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Custom keyboard pcb designUsing usb-c connector for usb 2.0 communication .
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Using USB-C connector for USB 2.0 Communication - The Gupta Empire
ATmega32u4 Schematic for Musical Interface | AVR Freaks
Care to give an opinion on an Atmega32u4 USB board schematic? : r/arduino
Pinout - Arduino chips
TIAO AVR / Micro SD Development Board (ATMEGA32U4) - TIAO's Wiki