This chapter discusses the following functions of servo motors:
The hardware needed to run the examples in this chapter includes:
Most motors are simple devices that turn on their axle when current is supplied. When a motor turns, the user generally has no idea about the angle or speed; to get this information, sensors are required. Servo motors differ by knowing exactly the angle that they are at and adjusting their position as required. Most servo motors cannot turn 360 degrees; instead, they are often limited to a range. Most servo motors have 180 degrees of rotation, as shown in Figure 14-1.
To know the exact position, servo motors can use a wide variety of techniques. Most use a potentiometer, using electrical resistance to understand how far the arm has turned, while more advanced systems use a coded optical wheel to get precise information.
Servo motors were originally designed in the dark times of war. They were used in radar and anti-aircraft artillery during ...