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hkit711 said:Thank you Nigel. I didn't thought about zero-crossing. I think that will work. By the way, the frequency is always 50 Hz.
hkit711 said:Dear Nigel. I'm not measuring the main power consumption. I'm building a "current overload protection" for an AC motor. I'm using a current transformer. I put a resistor in parallel with the secondary to have a voltage. I'm measuring that voltage and comparing with a set value. If this voltage (the current of the motor) goes higher then the set value then I will have a signal out to stop the motor. I will put the complete project on-line (because all of you guys are helping me to build it, it belongs to you too...) when I finish it to the end.
hkit711 said:That's right Leftyretro, but I'm trying to have a very compact circuit because I have more than 1 motor to control and it will be cheaper. It will be more complicated programing the PIC but cheaper for sure.