Hello, i'm pretty new on this and i'm trying to know if there if a wire is powered, what should i use? i have seen you can use a toroid or something but i dont know, all i want is to know if a 220v light is on or off, how can i do it? THANKS P.D: Sorry for my english.

wire powered?

stephen_t April 7, 2011, 4:56pm 2

Some form of light sensor (LDR, phototransistor etc) would be the easiest and safest - no connections to harmful voltages..........

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