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zero crossing detector circuit

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sjjm

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interruptual

i am looking for someone who has a tried and working circuit for a zero crossing detector which can be interfaced to a pic
 

hi..
you can use an OPAMP 741 for zero cross detector.
 

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Here are some other examples of zero crossing detectors ..

Regards,
IanP
 

It is easy man, think about this... each leg of microcontroller has two protection diodes (zener), if the applied volatge is over 5 volt, let us say 220 Vrms, then the zener will cut it to 5 volt, and if it is -220Vrms, then the another zener will work in forward and make the volatge almost zero.

What you need is high impedence resistor (100Mohm) connected from the source (220Vrm) directly to the PIC interrupt leg, or you can use non-interruptual method just by scanning that pin if the frequency is not very haigh.

You need some protection and noise remover circuits.

*** It is hazardous but will cost you nothing!!

Good luck

Hani
 

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