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Arduino Mega: there are two sets of 20-21 pins (circled.) What's going on there? If I want GPIO, D20 and D21, which set should I use? : r/arduino

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GitHub - MCUdude/MegaCoreX: An Arduino hardware package for ATmega4809, ATmega4808, ATmega3209, ATmega3208, ATmega1609, ATmega1608, ATmega809 and ATmega808

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Alexa and Arduinos : r/arduino

Arduino Mega pin 20 and 21 - Hardware - Home Assistant Community

OpenCM 9.04

OpenCM 9.04

Giant Electro-Mechanical Clock I built that runs off a Yun. (Video in Comments) : r/arduino

Arduino Mega: there are two sets of 20-21 pins (circled.) What's going on there? If I want GPIO, D20 and D21, which set should I use? : r/arduino

interrupt - Mega: attachInterrupt on pin 18/19/20/21 not working - Arduino Stack Exchange

Is there any way to have an Arduino Uno pin output 3.3V instead of 5V when it is high (looking for a non PWM solution)? - Quora

Overview, Introducing Feather RP2040 SCORPIO

Gammon Forum : Electronics : Microprocessors : Connecting a graphical LCD via a I2C/SPI using a 16-bit port expander