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Hi! Thanks for the nice example.Why I have "1" on the input D2 while the button is not pressed (Serial monitor from Arduino IDE shows it )? It seems that input is inverted - it shoud have "0" when it is no current or "1" when we have it (button pressed) - but I have oposite situation! On the other side - HIGH means "1" for me and we have LED bright with HIGH flag for the output D13....So it is normall behaviour...Please explain!