hello all,
doing experiment had power supply hooked relay. when relay triggered (closed), 5v power supply supposed read a0 on arduino, , pull digital i/o. however, seems arduino somehow being powered analog input? how possible? bad? did damage board? help!
doing experiment had power supply hooked relay. when relay triggered (closed), 5v power supply supposed read a0 on arduino, , pull digital i/o. however, seems arduino somehow being powered analog input? how possible? bad? did damage board? help!
it's called parasitic power - not recommended leave set power on 1 side of circuit.
Arduino Forum > Using Arduino > General Electronics > Backpowering via analog inputs?
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