• @DrAzzy I will try to get hold of a multimeter tomorrow and answer your question. For now I can only say that it's a one channel Arduino relay module connected with Espruino Board with shared GND, IN to C9 and VCC to VBat. I should also clarify that it fails when no explicit pin mode specified by me, but works when I set pin mode to "output" beforehand.

    And don't get me wrong guys, I'm not claiming that there is no good explanation for this behaviour. All I'm saying is that it has nothing to do with beginners friendliness :)


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