Mobile Cricket Killer

Brian DeJong and Dave Weir's "Cricket Killer" used an RC truck, with the remote control transmitter modified so that it could be controlled by a computer.

(click photos to enlarge)
A"cricket" clicker attached to the truck was activated periodically to produce a sharp acoustical signal.
The sound was detected by a number of microphones placed around the room. The times of arrival of the signal at the microphones were used to triangulate the location of the truck, with an accuracy of a few cm.
The truck was steered toward a goal location by the computer.
An 8-second avi video (with sound) of motion of the truck under computer control