In order to move the servos, you'll use a servo controller similar to the one introduced in Chapter 5, Building a Robot That Can Walk, to control six servos that will control the fingers, thumb, and wrist. As in Chapter 5, Building a Robot That Can Walk, the servo controller you are going to use for this project is a simple servo motor controller using the USB from Pololu. However, since you only need to control five servos, you can order the six-servo controller version available at https://www.pololu.com. Here is an image of the unit:

Make sure you order the assembled version. This piece of hardware will turn the USB commands from the Raspberry Pi Zero into signals that control your servo motors. There are two connections that you'll need to make to the servo controller to get started: the first to the servo motors and the second to a power source.

First, connect the servos to the controller. In order to be consistent, let's connect your six servos to the connections...