CDBot (I know, I couldn't think of a better name) is an
autonomous mobile robot built around a few old CD ROMS (AOL etc!). It's sensors include 2 LDRs for light following, 3 bump switches, 2 IR proximity detectors, 3 IR reflective sensors for line following, 1 pyroelectric sensor for people detection and 1 Sharp IR range finder.
The brains behind the robot (loosely speaking, anyway) is a
Motorola HC11 microcontroller and the robot is driven by 2 modified servo motors.