Learning Robotics using Python - Second Edition

Motor driver

A motor driver, or motor controller, is a circuit that can control the speed of the motor. By controlling the motors, we mean that we can control the voltage across the motors and can also control the direction and speed of the motors. Motors can rotate clockwise or counter clockwise if we change the polarity of the motor terminal.

H-bridge circuits are commonly used in motor controllers. An H-bridge is an electronic circuit that can apply voltage in either direction of the load. It has high current-handling properties and can change the direction of the current flow.

The following diagram shows a basic H-bridge circuit using switches:

H -bridge circuit

The direction of the motor according to the state of the four switches is ...