please help me how to build a circuit that will indicate whether an ac device is on or off????the output of the cicuit is 5v dc so that i can use it as an input for my program...ive got an idea to use a transformer in series with the ac device and use it to activate a circuit that will send a 5v dc signal whenever an ac device is turned on..but it might affect the voltage and current coming into the ac device itself and also its impractical if i have plenty of device to check whether its on or off.........
thanks...................
Hi
perhaps in the so called AC device, you can an opto isolator to help convert its ON / OFF condtion.
accordinly you can perhaps use the transister portion by wiring up to your PC monitoring , this transistor can be powered by the PC . if it is ON the device is ON and vice versa.