Arduino mega 2560 pin out4/9/2024 That means that if you install MegaCore via Boards Manager, or have an old manually installed version, you will only be able to use the extra pins with Tools > Pinout > AVR pinout selected (and note that pinout has different pin mapping than what is marked on the Mega's silkscreen. The attached Mega 2560 board pin-out shows the most commonly used functions for the pins, but some pins can support other functions. Yes, you could modify the variant file, but this work has already been done for us by MCUdude in their excellent MegaCore, so it's much better to not duplicate work that is already I should have mentioned that, although the work has been done to support all pins of the ATmega2560 in both the pinout options for the ATmega2560, this work for the "Arduino MEGA pinout" was done after the time of the last MegaCore release. However in the schemati I2C bus seems to be on pins 43 and 44. ![]() Looking at the chip it's a smaller board than the Arduino Uno so I don't want to pop it. Well I've looked and looked and just cant find data on the max current of the 5 v output (or even a suggested reasonable max) They all mention 50 mA for the 3.3v output. If you want to use extra pins, you can rewrite the Arduino header file, add the extra pins to be used in the Arduino header file, and ensure that they do not conflict with the original used pins. Documentation seems to say that I2C bus uses pins 20 and 21. 5 volt output max current for Arduino Mega 2560 rev3. The compiler in this case is avr-gcc, though each hardware package can use its own compiler tool. The default compiler* (that is, the Arduino IDE)
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