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Originally Posted by coolhandcountry
Could you put a small light bulb on the wire for a resistor?
Then you could have a detection of where or not it is on as well.
Just a thought from a non electrically forum member. ;)
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Lol. Yeah, that could work as long as the bulb was not run over or under its rated voltage.
FYI: A bulb's filament has close to 0 ohms of resistance when off. Only as it heats up and glows does the resistance go up - rudimentary current-limiting. This, incidentally, is why a bulb almost always blows when you first turn it on. So if you use a 12v bulb on the 5v line, the bulb may glow weakly or not at all and you'll probably activate the protection circuitry of the PS or blow the bulb.