In this chapter, you have learned how to connect your first sensor, a line sensor, to the robot. You've used a breadboard and wired the sensor into the Raspberry Pi.
You've added the sensor into the robot object, so it can be used in behaviors and so the behavior can be used with robots using sensors such as these on different pins. You have a test track to be able to test and demonstrate the line-following behavior and, if you are feeling excited, you know how to draw more of them. Finally, you've built a behavior for line tracking and seen it work—a simple bit of code but a behavior that starts to feel a little smart.
In the next chapter, we will make our robot both easier to debug and a little more visually engaging by using a multi-color LED strip with it.
