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irishbeard

Controlling analog pins as digital pins in Marlin

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Hi,

I'm interested in controlling some of the analog (ADC) pins as digital pins on the Ultimaker 2 board. I've seen that this can be done in Arduino using digitalWrite (https://www.arduino.cc/en/Tutorial/AnalogInputPins) and it also seems like it is possible to control them using the M42 command in marlin (http://marlinfw.org/docs/gcode/M042.html). Has anyone tried this or know if this is correct?

I've found the pin map for the ATmega 2560 (https://www.arduino.cc/en/Hacking/PinMapping2560) and can determine the pin locations using the Ultimaker 2 schematics. However, I'm not sure how to interface with the ADC0-11 pins (M42 PA0 S255 doesn't work). Do the analog pins have a digital pin equivalent on the Ultimaker 2 board (ex: A0 = digital pin XX)? Do I need to set this up myself in the pins.h file?

Any ideas / comments are greatly appreciated! :)

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