8.1.3 Why use R/C servos?

For any robot that needs limited angular control, R/C servos are good choices. This is because R/C servos can be inexpensive (less than $10 each, as of 2004), and they come in all sizes and capabilities. It is relatively easy to mount a GP2D12 sensor (or any other ranging sensor) on an R/C servo for scanning purposes.

R/C servos are also commonly used in smaller legged robots for actuating the legs and other limbs.

Interestingly, R/C servos are also used in some small wheeled robots. Most R/C servos can be modified for full rotation (instead of -90 degree to +90 degrees).

The main advantage of robots utilizing modified R/C servos for full rotation is packaging and size. The standard size R/C servos pack lots of torque in a small package. Furthermore, despite the high gear ratio, most R/C servos have little play. The low voltage requirement of R/C servos is also an attractive features.