Yeah, I need the RMS i.e. 220V :)

The Filtering idea was provided by Dwayne as part of his code and I took 
it kind of good, since "smoothing" could've helped in making the samples 
more "smooth"...

But indeed the idea of grabbing the peak out of 20mS makes sense - I 
started with a FFT, then I realized (and was suggested) it was too much. 
Then I wanted to take a sample here & there, and this was not going to 
work. Then I made up my mind with the "20mS window" and now this gets 
better.

I do have memory - a 24F PIC, so I might try what you suggest. I will 
recheck your calculations about degrees and errors, but makes sense.

I also have to say that, after the IIR, overall sum of 20 samples does 
no longer yeld 0... ! (this was part of my astonishment, but I have 
proably skipped some steps)

thank you!

-- 

Ciao, Dario
--
Cyberdyne
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