This idea could be practical if the OP weren't planning to design a dedicat=
ef board.

It is much simpler, more compact and reliable (and lesss wasteful of energy=
) to use a dedicated circuito.

David Bearrow <chipbug@verizon.net> escreveu:
>I think I would just use a small 5VDC power supply. Then you could
>detect 5V
>or 0V depending on if it was on or off. There are lots of off the shelf
>supplies or you could build one.
>
>David Bearrow
>
>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
>Behalf Of
>Carl Denk
>Sent: Monday, September 16, 2013 7:34 AM
>To: PICLIST
>Subject: [PIC} AC inputs to a PIC
>
>I have a home project coming down the road mainly HVAC stuff of digital
>
>inputs to a PIC probably a 18F??. THe inputs would be only to sense=20
>on/off. The voltages would be 24 VAC, 120 VAC, and 240 VAC. I'm
>thinking=20
>through an Opto isolator with a resistor and capacitor on the AC side.=20
>Values ? Configuration? or something else?
>
>This is a low priority at the moment, but thought I would generate some
>
>traffic for Bob. :)
>
>Thanks again.
>--=20
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