LEGO MINDSTORMS Robots

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Flip the robot over and attach the wires as shown. The motors are attached to output A and output C, while the light sensor is attached to input 2.
Some Tricky Programming
It's surprisingly hard to convince our robot to follow a black line on the floor. (A lot of things in mobile robotics are surprisingly hard, as we discussed in Chapter 1, Robotics and MINDSTORMS.)
The simplest way to describe the program is this: