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ATmega328 - Wikipedia
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I've filled all the digital pins on my Arduino Uno and am worried I might need more. How can I add more digital pins without having to upgrade boards? - Quora
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Arduino Compatible : Mega 2560 R3 ATmega2560-16AU CH340G ...
GPIO pins of ESP8266 and How to use efficiently -IoTbyHVM
Arduino Mega 2560, 54 Digital Input/Output Pins, Rs 630 /piece | ID: 7372017697
diymore ATmega16 ATmega32 ISP I/O Minimum System Development Board AVR – diymore
