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@Oscar
Digital-only PIN or ADC pin - both tried as digital with no difference.
Pin 28 also as analog input using analogRead(), but then setWatch does not seem to work.
I guess I could avoid the problem entirely using setInterval instead of setWatch and figure an interval that would feel quick enough to catch all "touches". In that case I would use analogRead(D28) > 0.5 as "high" and my problems would go away.
3.3V input test: I connect D28 to the 3.3V pin of the board or the input pin of the touch sensor (the sensor is fed by the 3.3V pin of the board).