John Sanderson wrote:
> 
> Bonjour Gael & PIC.ers,
> 
> I did this a while back. You might get some ideas from the code
> below, this part of the project worked well.
> ..
> Pity about the rest of the job....
> ..

Here is another easy way to do it :

1) Connect the pot from 5V to an input pin.
2) Connect a smallish cap (100nF) to the input pin.
3) Connect another pin (output) to the input pin via a resistor.

In your program, count the number of 0V pulses you have to hit 
the output pin before the input pin becomes negative.

-- 
Friendly Regards          /"\
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Tjaart van der Walt        X  ASCII RIBBON CAMPAIGN
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