The circuit is straight forward. The 10k LIN variable resistor is at the ends connected to the + and - so that the PIC input can cover the full range. This because the AD routine can only convert a voltage. So whatever you want to measure the resistance of it has to be connected in such a way that it acts as a voltage divider.
Here's a clever design idea lifted from the pages of Electronic Design. Stephen Woodward has designed a circuit that allows one pot to adjust two channels.
How to use the PC to connect to a Nutchip in order to read a remote control, to sense a smart-card, to enable outputs or to read inputs? Here are serial communication secrets, from the protocol to a working example. Source code is provided.
A circuit that limits the rate of change of a signal; a feature of this design is that the positive and negative rates can be different.
The easiest way is to use resistors. A two way matching network uses a 43.3 ohm and 86.6ohm resistors