I have an application that uses the joystick ports on a pic to read values
on 4 20K pots.

apart form using digital pots, which i may very well have to use, how can i
simulate the pot values with a PIC ( some PWM ?? ) ??

Accuracy is not THAT important, as i think the  A/D on the joystick port
isnt all that acurate anyway.  I do however need decent linearity.

The end result is a pic will receive a signal via rs485 that it must then
"send" to the joystick ports. I dont have access to the original pc side
program to change the way it works.

Any ideas???

John

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