i am curious how this is so , i put it down to the capacitors in the power supply having enough to keep the arduino running all night and never stops when the PC is off.just curious
you will find that most PC's keep +5 (and usually +3.3) volts going to parts of the system (for things like suspend to ram) and have not shut fully off since we switched over to ATX in the late 90's that is unless you kill the AC Mains going into itSeems like nothing shuts off anymore, it just goes into standby, which is pretty wasteful considering all the little currents in your house consuming power while not being used, often, if nothing else, to light an LED to show you that you are not using it :~
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