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Arduino Nano Pinout, ATmega 328P Pin Mapping, EAGLE Files, Schematics, and More! - Documents - Arduino - element14 Community
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arduino - Are both ground pins on the ATMEGA internally connected? - Electrical Engineering Stack Exchange
GitHub - MCUdude/MiniCore: Arduino hardware package for ATmega8, ATmega48, ATmega88, ATmega168, ATmega328 and ATmega328PB
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