No...there are other ways.  Use one of the AD chips with a I2C interface on
it, or look at the cypress PSoC examples on how they do it


>From: Brian Clewer <brianclewer@MISTRAL.CO.UK>
>Reply-To: pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: ] AC Voltage measurement
>Date: Wed, 14 Apr 2004 17:52:34 +0100
>
>Ian wrote:
>
>
> > Hi all,
> >
> > Could someone point me somewhere or give some advice on monitoring
>240VAC
> > 50Hz mains voltage using PIC A/D.
> >
>
>
>It's not the only solution, but here is what I would do:
>1. use the step down transformer
>2. connect the output into an RMS chip such as the AD736 or similar.
>3. the output then connects to the A/D
>
>Brian.
>
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