This project is for those of you that want to explore communications via LEO (Low Earth Orbit) satellites. You can manually point your antenna, but a micro-controller makes it a whole lot easier.
The basis for operation is fairly straightforward. A tracking program (WiSP, Nova for Windows, The Station Program, and DK1TB's SatPC32 program are all known to work) sends data in the EASYCOMM data format out a standard serial port to the SAEBRTrack unit. The Parallax BASIC Stamp 2 decodes the azimuth and elevation information sent by the tracking program, and the array is positioned.
Read more about making your own Satellite Tracker
http://blog.makezine.com/archive/2008/05/diy_satellite_tracker.html