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ac frequency measurement with isolation

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zeroskj1988

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i want use measure the frequency of ac(normaly 50hz).since i have problem with common ground,i want to isolate the neural line. so i use a optocoupler to isolate the ac
my circuitis-------half wave rectifier---100k-1k voltage divider---then optocounpler to ccp2 ofpic16f877a. i use timer 1 to find the period. can any body spot, any problem with this logic. thanks in advance actually it is not working
 
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choose some uc with timer interval counter like aduc

it provides a independent time counter, so that you can count the pulses uninterruptedly.
 

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