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Hi..
i was wondering can i use a 2Mega or 3Mega Ohms resistor in the interrupt pin of my uC to detect AC220V zero crossing. I understand my uC will not be mains isolated which is ok for my application.
Regards.
I also found AVR's version of main interrupt detection, hope this will help others.hi,
This is a microchip pdf for mains interrupt.
E
HiWhen you connect to the power line look at the resistor voltage ratings.
It is likely that your resistor can not with stand line voltage for long periods of time. You might need to use two or more resistors in series.