Hi, all, According to the reference, the digitalWrite(pin, HIGH) command would set 5v or 0v to the pin when the command is digitalWrite(pin,LOW), but the waveform of the output pin, captured with a virtual scope, differs from the conclusion above, the waveform indicates the output voltage is set to…

Does Arduino keep the state of pin?

liuzengqiang August 15, 2011, 1:20am 3

Probably used AC coupling where dc is needed.

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