I have a battery that powers an arduino and the arduino energizes a switch. Beside a bad design, is it harmful that the switch is being energized by the battery and an output from the arduino? Would this cause harm to the arduino?
Does it make a difference if I put a diode on the output of the arduino like in diagram #2?
Does it make a difference if I put a diode on the output of the arduino like in diagram #2?
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