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Originally Posted by Garrett.d.w
If you want to use a computer to send commands to the arduino then use Processing (arduino's computer based cousin). There is a library included in the software package that allows you to interface with the arduino though the usb serial connection.
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Good information, and the link to the PS2 library was really handy. I was also considering an XBee radio or other wireless interface at some point to build a more complete low cost Arduino controller. However, do not write off the more crude method of wiring directly into the controller to get at the potentiometers. While this is a much less elegant solution than what you propose it has some other values.
1. Dirt cheap. (I am comparing to the wireless version here) You can build the entire (wired) control system including the computer for less than $30 if you scrounge a few parts for the box and connectors. This is a more reasonable price if your intent is just to build a small debug tool.
2. The students get to open up the controller, identify and test them with a multimeter, see how the joysticks were used, and connect to them. I find it hard to get some of the students interested in practicing soldering skills. But this project did interest them.
3. I think it is easier for the students to understand the complete operation of the simpler system. At least till they get more experience with the Arduino.
4. You can use this approach for controlling your own analog circuits or devices other than the Arduino.
But, you are right that library is cool. I will have to try it now. It is too bad the PS2 used such a large and unusual connector. If it already came with something small and common you could be up and running in half the time.