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From: James Meyer
Subject: Re: 68hc11 A/D converter question
X-Newsreader: Forte Agent 1.92/32.572
Date: Fri, 27 Dec 2002 00:41:44 GMT
NNTP-Posting-Date: Thu, 26 Dec 2002 19:41:44 EST
On Thu, 26 Dec 2002 22:25:26 GMT, spoisn wroth:
> I am building a single axis joystick for a robot. I will have to use
>a potentiometer(linear) in order to determine the joystick position. I am
>using the A/D on the 68hc11 and have connected a voltage divider circuit as
> +5V <-----/\/\/\-------/\/\/\------GND
> fixed | pot
> resistor |
> Vout(To A/D on 68hc11)
>My problem is that Vout does not vary linearly. It changes faster at lower
>pot values and slower at higher pot values. Is there any way to fix this
>non-linearity? Any suggestions will be appreciated. TIA.
Substitute a constant current source for the fixed resistor. A JFET
with its gate connected to its source might work.
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