Movie of Lego robot tank
This is a YouTube version of a movie of the Lego Mindstorms tank in action !
The automatic brick shooting mechanism is quite brilliant, if I may say so. Ok, it completely came apart during the second shot, but ok ;-)
When the tank starts to move the IR (infra red) sensor lights of the Mindstorms unit flash. The webcam used to film this action is sensitive to IR light.