> > Well then, anytime the processor isn't busy just grab signal
> > samples off the A/D converter.  Record the highest reading you
> > get after grabbing some number of samples...that's the + amplitude,
> > assuming it was a real signal you were reading.
>
> Sometime things are just that simple, thanks!

Sometimes, but not this time.  You said the frequency was 120KHz.  That's a
lot faster than the PIC A/D can sample.  You would have to sample every 4uS
to beat the Nyquist rate.  You could do some fancy pseudo random sampling,
but I think a little external hardware is called for here.  Fortunately this
is pretty simple.  All you need is an op amp, diode, capacitor, and
resistor.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads