ATmega328P-AU Pin22 (Arduino Pin ADC7): can we take 3.3V from it? - Microcontrollers - Arduino Forum
Arduino Nano Pinout, ATmega 328P Pin Mapping, EAGLE Files, Schematics, and More! - element14 Community
ATMEGA328P Pinout, Programming, Features, and Applications
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GitHub - MCUdude/MiniCore: Arduino hardware package for ATmega8, ATmega48, ATmega88, ATmega168, ATmega328 and ATmega328PB