Wow, we learned a lot in this chapter! Let's review what we covered.

We started by introducing some cool new building techniques, such as creating a unique exterior design, using caster wheels for maximum mobility, and taking advantage of the bevel gear's ability to make both parallel and 90-degree gear meshes. Then, we revisited some of the engineering principles that we learned in earlier chapters, such as tank-style steering (this time with wheels) and cam-and-rod mechanisms.

We also expanded our knowledge of EV3 programming. We learned how to make a custom GUI, then incorporated the color sensor and the random number generator block for the first time. We reapplied beacon following, tank-style remote control, and obstacle detection/avoidance. Throughout the programming process, we saw some examples of how creative programming can give a robot its own unique personality!

Finally, we learned that a project may need multiple revisions before it is polished enough to be considered finished. In the case of the Timmyton, it took many revisions over the course of a few years to arrive at the completed robot. Keep this in mind when you are building your own smart robot; do not be discouraged if you need to redesign it!

By now, your library of EV3 knowledge is starting to become very deep. In the next chapter, we will be making another interactive robot, but taking things in a whole new direction. It is time to make Grunt, our first bipedal robot!