>-----Original Message-----
>From: Jinx [mailto:joecolquitt@CLEAR.NET.NZ]
>Sent: 20 January 2004 07:20
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: [PIC:]18F452 A2D problem
>
>
>> so to test it I have a 5K pot connected between 5V and ground
>
>The maximum recommended pot is 2k5 for the 18F452, not 10k
>as on previous families. I can't say if anything else is wrong
>with your set-up but you should correct this first
>

A 5k pot gives a 1.25k source impedance, so this is well in spec.  A 10K pot
would be just in spec at 2.5K.

Mark, could the you post the code you are using to perform the conversion
and read the A/D result?  Is your PIC well decoupled with suitable
capacitors physically near the Vss and Vdd pins?

Regards

Mike




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