I am to use a 24FJxxGA106 to (along other things) measure 220V mains 
voltage with some coarse accuracy, say 1-2%

I have a small 220->6V transformer, whose inputs goes via a partitor 
(still have to decide, but let's assume it 4K7 - 2K2) to AN2 of the PIC. 
So, more or less 2Vrms or 3Vpp circa when mains is nominal 220V.

I'm planning on sampling/reading the input voltage some ... 100? times / 
second, and perform a ... FFT or something simpler upon it.

Can you suggest the simplest way to achieve that result?

TIA


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Ciao, Dario
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Cyberdyne
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