A while back, I was researching sensors for a project I was working on when I came across a little device called a CMUcam. The CMUcam is a low-cost vision sensor developed by Carnegie Mellon University ([url=http://www.cmu.edu]http://www.cmu.edu[/url]). The CMUcam has both an RS232 level interface, as well as a TTL level serial interface so you can connect it to your favorite microcontroller or directly to a PC...
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Control Your World 2006-07 (Zeus Software and CMU support files)