Mini line tracer

This is the story of how i made my first robot, and the instructions to build one yourself. It's a simple line tracer, controlled by two op-amps. No microcontroller, no programming... simple analog circuitry. I tried to make it as small as possible, using SMD components and tiny motors. I'm very happy with the final result, the robot can follow 1-2cm wide black lines on white background, and is quite fast. ...

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