Buy Robot kits at http://www.sciencestoreforthestars.com/robot-building-kits.aspx – OWI Hyper Line Tracker infrared robot kit, OWI-9737, non-soldering, it possesses a sonic tracking system, and is fortified with a multitude of sensors including photo transistors to detect a black line, tracking memory to memorize its last track of the black line, and two red LEDs that flash to tell you which side of the light sensor is activated. Science Store for the Stars sells all OWI Robot kits!
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