LilyPad Arduino USB - ATmega32U4 Board (Open hardware) copy - EasyEDA
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Care to give an opinion on an Atmega32u4 USB board schematic? : r/arduino
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TIAO AVR / Micro SD Development Board (ATMEGA32U4) - TIAO's Wiki
Arduino Leonardo Pinout, ATmega 32U4 Pin Mapping, Schematics, EAGLE Files, and More! - Documents - Arduino - element14 Community
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