Book Image

Raspberry Pi Robotics Essentials

By : Richard Grimmett
Book Image

Raspberry Pi Robotics Essentials

By: Richard Grimmett

Overview of this book

Table of Contents (14 chapters)
Raspberry Pi Robotics Essentials
About the Author
About the Reviewers

How servo motors work

Servo motors are somewhat similar to DC motors. However, there is an important difference. While DC motors are generally designed to move in a continuous way—rotating 360 degrees at a given speed—servos are generally designed to move to a limited set of angles. In other words, in the DC motor world, you generally want your motors to spin with a continuous rotation speed that you control. In the servo world, you want your motor to move to a specific position that you control.

This is done by sending a Pulse-Width-Modulated (PWM) signal to the control connector of the servo. The length of this pulse will control the angle of the servo like this:

These pulses are sent out with a repetition rate of 60 Hz. You can position the servo to any angle by setting the correct control pulse.