> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of John Ferrell
> Sent: 06 May 2008 20:31
> To: Microcontroller discussion list - Public.
> Subject: Re: [PIC]Analog signal conditioning
> 
> Until I fell into the trap I would have agreed with you. The AP Notes
> regarding ADC are serious reading.
> If you keep the pot onboard with the PIC you can get away with a lot.
> Reading the wiper of a 5K pot across Vcc and ground is not a problem.
> 
> My Pot is at the end of about 75 feet of cable. The cable contributes
some
> unknown reactance in the configuration. The troublesome noise is a
> byproduct
> of the conversion within the PIC.  The current requirements are likely
to
> be
> damaging to the Pot (500 ohms) if I simply put Vcc across it... I have
a
> 4.3K resistor in series with it.
> 
> The conclusion that I draw at this time is that remote sensing is not
a
> simple matter even if it is just a resistor.
> 

Did you see my original post on differential measurement?

Mike

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