> > 220V -> transformer -> one leg to GND, other to partitor -> partitor
> > output to PIC || diode.

> Oh, that makes things a bit more difficult. =A0I'm assuming "partitor" is=
 a
> resistive voltage divider?

Ah!

IF partitor is a resistive divider then you can.
- Connect one transformer leg to Vdd.
- Connect other leg to top of divider.
- Discard diode
- Connect PIC ADC input to divider "tap".

You now have my scheme, always positive, full cycle.
Minimum is above ground and positive below Vdd when divider is set correctl=
y.
(See prior decription).

            Russell
.

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