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I don't see anything that has been clear about which digital pins map to which physical ones. If someone could point me in the right direction it would be a big help.

For exampleThrough trial and error, i've found that if i set digital pin 3 in the Arduino IDE, it is mapped to D0 on J6, but surely this is documented somewhere?

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    I just Google "Arduino Industrial 101", tab Images and found what you are looking for. Pinout for other Arduinos can be a good starting point, I guess – user31481 Oct 30 '17 at 8:54
  • We must have different search results, because that was the second thing i did and didn't see what i was looking for, but thanks for looking. – Taekahn Oct 31 '17 at 3:45
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I found what i was looking for on the arduino github repository.

Arduino/hardware/arduino/avr/variants/

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