The 3pi robot [http://www.pololu.com/catalog/product/975] is complete mobile platform designed to excel in linefollowing and maze-solving competitions. The 3pi has user accessible I/O lines that can be connected to different sensors to expand its behavior beyond line-following and maze-solving. This project shows just one possible configuration where two Sharp analog distance sensors are connected with minimal soldering. Many other sensors could be used to expand the 3pi: a radio-control receiver could make an RC 3pi [http://www.pololu.com/docs/0J37.a] gyro could enable precision spinning, a sonar range finder [http://www.pololu.com/catalog/product/723] could improve the 3pi’s sensing range, and a digital distance sensor [http://www.pololu.com/catalog/product/1134] could offer speedy front obstacle detection!

3pi_wall_follower.pdf

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