In this chapter, you'll build a quadruped, that is, a robot with four legs. You'll be using 12 servos so that each leg has three points that can move, or three Degrees of Freedom (DOF). In Chapter 6, A Robot that Can Sail, you'll learn how to control servomotors directly using the GPIO pins of the BeagleBone Black. In this project, you'll control 12 servos at the same time, so it will make more sense to use an external servo controller that can supply the control signals and supply voltages for all the 12 servos.
Since servos are the main component of this project, it is perhaps useful to go through a tutorial on servos and how to control them.
