>-----Original Message-----
>From: Brian Clewer [mailto:brianclewer@MISTRAL.CO.UK]
>Sent: 15 March 2004 12:55
>To: PICLIST@MITVMA.MIT.EDU
>Subject: [PIC:] FFT using a PIC
>
>
>Hi all,
>do any of you out there know if there are any web sites
>documenting how an FFT is done using data produced from the
>A/D converter?  Probably pushing the boundary of the PIC a
>little here, as I know there are quite a few calculations to
>be done.  Ultimately, I would like to find out what is the
>prime frequency and where the side bands are for an
>oscillation in the region of 10-300Hz for a period of about 5
>seconds.  Maybe I would be better off using a DSP, but I have
>never used them in the past.
>
>Here's hoping...:)
>
>Brian.


This is just the sort of thing the dsPIC was made for.  Microchip even have
a bunch of DSP libraries (including FFT) available for free on their web
site.

If you want to stick to a PIC, Circuit Cellar had a project using a 17C
series device that produced a spectrum analyser output on a video display,
the PIC doing all the FFT and video timing.  The article is
http://8ball.ofb.net/~heath/eeg/laco-98.pdf and the code should be on the CC
web site.

Regards

Mike




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