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Lego Mindstorms EV3 Essentials by Abid H. Mujtaba

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Construction

Studying the required behavior/specifications indicates that the Line-follower robot has two major components: color detection and locomotion. This informs the construction of the robot. We obviously need a color sensor placed at the front of the robot and pointed towards the bottom/floor to detect the line/path.

The robot's motion consists of moving in a straight line and turning/pivoting in its place at times. The ideal solution for these motion specifications is the differential drive—two large motors placed in parallel and controlled independently. The next section will discuss the differential drive in greater detail.

As in Chapter 3, EV3 Brick Programming, where we created the Obstacle-avoiding robot which also had the differential ...

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