How to control a DC Motor using ZX

DC Motors are ideal for building small robotic systems. These motors need a current source of between 100 milliamperes and an ampere. However, the I/O pins of a typical robot microcontroller can output only a small amount of current (less than 20 milliamps typically). An intermediate circuit is needed to interface a microcontroller to a DC motor to provide sufficient current to run the motor. In this paper we look at the H-bridge control circuit as a means of controlling a DC motor. This circuit also allows for current to flow through a motor in different directions, thus controlling the direction of rotation of the motor.