> >Is there an application note?
>
> You just read it!  Actually, I think that you can read the
> appnote on using
> a digital input pin as an adc and just think about it.  This will help you
> a lot.

I shall, and I'll build an application note.  I've wanted to do this for
sometime, as the 8 bit ADC limits the PIC chips I can use.  I suspect some
attention to temperature drift should be provided as well as some
'engineering
rules of thumb' on component selection.

> Also, play around.

Thanks for the info, but I don't think my wife would approve.
wink wink nudge nudge)

> Andy

Craig