In this chapter, we set about enhancing and utilizing our knowledge of LeJOS by beginning the implementation of a Line-follower robot. You learned what a Line-follower robot is and detailed its behavior.

We analyzed the required behavior and decided that the robot will have two major components: a color sensor and a differential drive. We built the physical part of the robot (a modified EV3 TRACK3R) and then implemented the software for controlling the differential drive. The chapter ended with a test of this implementation, making sure that the robot moves forward and rotates in its place when instructed.

The next chapter will deal with programming the color sensor, while the final chapter will bring together these bits of code to make the robot behave as per requirements.