Uploaded August 2012 | Updated September 2026, 5 hours ago

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RCX - Robot Command eXplorer
RIS - Robotics Invention System (predecessor to the NXT)

This was a small, simple line follower put together for BrickFair two days before the event.


This robot uses a pair of light sensors to detect differences in reflected light from a surface (in this case, to follow a black line). Depending on what the sensors detect control the power and the direction of the drive motors.
On curves, the inner wheel coasts while the outer wheel drives the robot around the curve and it slows down the outer wheel motor. On straights both motors run and run at higher power for faster movement. _
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