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Originally Posted by WillyC
Interesting point...
I don't think it's realistic (or at least necessary) to follow the line "perfectly". If you use two sensors, one on either side of the line, and space them out a bit (i.e. for a 2" line put the sensors about 4" apart), then the robot will "waddle" down the line. You know that when you get to the end of the line, the robot will be within 2" horizontally of it's target. It may be pointing at a bit of an angle, but it will be there. If you combine this with some other sensory info (turn counting, timing, gyros etc), you have a pretty robust system. But not perfect...
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Our team tried it with two sensors and we had the problem of over shooting the corners if we tried to have the robot moving at all times. If every time the sensor hit the line and we stopped and moved left/right motors it worked fine but it was kinda slow.