Why do we need control?

Last week, we saw that by using Pulse Width Modulation (PWM) we can generate the correct average voltage so that the motor rotates at the correct speed.

We also noted how switches arranged as a bridge circuit could be used to set whether the motor rotates left or right and how we could measure the speed, and stated that would be needed for control.

But do we need control? The actual motor speed is not necessarily what we intended when we set a specific PWM signal.

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This video is from the free online course:

Begin Robotics

University of Reading