Abstract
This chapter describes the clones of two very famous robots: R2–D2 from George Lucas' Star Wars saga. The “real” R2–D2 is essentially made of a cylindrical body culminating in a hemispherical head. Two rigid legs come out from its sides, ending with the wheels that provide motion to the robot. R2–D2 is a differential drive. The original character also features a front retractable wheel, used only under certain conditions; in the model, it is the third supporting point necessary for balance. In addition, this chapter also explains how to program a droid. The model of R2–D2 has been conceived as a light follower. The idea is that one drives it using a source of light, like a flashlight. However, this task requires a different strategy.
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