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Kyle writes in about this simple arduino and bulldozer kit robot that follows a projected line:
A regular line follower robot consists one to three photodiodes that reads brightness (usually with IR lights) on the floor. Based on the readings, we program it in a way that the center photodiode always stays on the black line on the floor. If either side of the photodiodes reads black, that means the robot is off the track, turns the robot the other direction so that the robot will always stay in the center.
Last year at high school we had to make something similar with a LEGO MIND STORM kit (or whatever they are).
We only used 1 light detector.
It just ran like if the light detected was too light then it would start scanning by turning left 20 degrees then right 40 then left 60 right 80 etc so it would overlap what it scanned increasing as it goes so it wont accidentally go back on its own line.
It was much faster and less fiddly than 3 sensors.
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