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7. DC motor control using a L293D driver
With this application we will move a DC motor using a power IC, specifi c for these
applications. The circuit you can move up to two motors, we'll only do it with one.
In this Assembly, we can move the motor in both rotation directions, which we
couldn't with the previous assembly.
It will function as the fi rst approach of the previous motor, i.e., let's create a power
surge and a descent ramp so motor change speed in automatic mode.
DC motor control or driver:
The two parameters that we want to control of a DC motor is its speed and its
rotation direction. The direction is controlled by changing the polarity. On the
other hand, for its speed, we must use modulation technique for PWM-pulse
width.
Here are some graphs showing the relationship between the pulse (PWM) signal
and the effective voltage:
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