Common servomotors, or servos, are internally geared motors that allow you to rotate its shaft to a precise angle within a 180-degree arc. They are a core component of industrial robots, and toys alike, and we're all familiar with hobby servos found in toys such as radio-controlled cars, planes, and drones.
Pictured in Figure 10.1 are a full-size hobby-style servo, a micro servo, and a set of header pins, which are useful to help connect a servo to a breadboard, which we will need to do later in this section as we build our circuit:
The great feature of servos is that they are essentially a Plug'n'Play style device – after we connect them to the power supply, we just need to send them a PWM signal that encodes the angle we want the servo to rotate to, and presto! We're done. No ICs, no transistors, or any other external circuitry. What's even better is that servo control is so common that...