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'A/D conversion question'
1999\02\02@152147 by Andres Tarzia

Hi all,

I am trying to build a mains voltage and frequency monitor (110V 60Hz / 220V
50Hz autoranging) using a PIC 16C72 with an LCD for presentation. I am
managing to finish the frequency meter, but I don't know how to feed the A/D
module (which accepts DC) with AC.

Should I sample the rectified, scaled-down sinewave as many times as I can
and then use the maximum value as "peak" voltage?

Would it be better to use a 10uF electrolytic capacitor to get DC and feed
that to the A/D module?

Please, if anyone has successfully used the A/D module for measuring AC,
tell me how to do it.

Thank you.

Andres Tarzia
Technology Consultant, SMART S.A.
Tel: +54 (11) 4323-3582 Fax: +54 (11) 4322-1824

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