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On the Nano, A3 is part of the analog port, according to http://avrchip.com/arduino-nano-datasheet-and-tuto...I suspect it's different for different flavour boards, but it seems to be working. Thanks for the info on not needing pinMode - I didn't know that! :)
Interesting! I guess it's still technically accurate to call him Charles Darwin, but I may update this in the future.
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