Hyper Line Tracker
The HYPER LINE TRACKER is a robot you build yourself. Draw a black line on white paper and watch as the robot will follow it. A light sensor which consists of an LED and phototransistors distinguishes the black colour from the white background and controls the motors to follow it. The HYPER LINE TRACER also comes with two flashing LED 'eye's that tell you which side of the light sensor is activating.