Good point.

How about adjusting the reference voltages to correct
for this?

Yes, I know there are better ways to solve this problem
-- I'm just in a Rube-Goldberg mood today. :-)

Cheers,
-Neil.




-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Michael Rigby-Jones
Sent: Thursday, June 13, 2002 10:44 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]:strange analog in problem


> -----Original Message-----
> From: Pic Dude [SMTP:picdude@AVN-TECH.COM]
> Sent: Thursday, June 13, 2002 4:17 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [PIC]:strange analog in problem
>
> For simplicity, could you not form a voltage divider
> w/2 fixed resistors, and the large variable resistor
> to be measured placed in parallel across one of the
> fixed resistors?  Of course you now need some math
> since the voltage measured at the AD port is no longer
> linearly proportional to the variable resistance.
>
> Cheers,
> -Neil.
>
The change in voltage at the A/D converter would be very small which could
reduce resolution to unacceptable levels.

Regards

Mike

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