• Oh, if it works with pinMode() set to output, but not with pinMode() not set, it's not what I thought it was.

    I think I see what's happening.... I'll bet it sets it to input to read it, but because there's a load on the pin, the voltage is dropping as soon as it's no longer an output - so fast that by the time it reads it, it's no longer high anymore...

    Yeah, this behavior is kinda ugly. I always explicitly set pinMode() so I don't run into this sort of behavior.


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