The AVRcam is a small, real-time image processing engine capable of tracking colorful objects. The system was specifically designed to provide the everyday-hobbyist with a vision system that can be easily added to their projects (robot, security, monitoring, etc).

Show your talent by DIY a Sun Tracking Unit: ScienceProg

An infrared (IR) link that provides bi-directional communication between the NXT and the new Power-Functions system, which consists of a battery box, motors, a remote control (an IR transmitter) and an IR receiver that controls the motors.