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Raspberry Pi 3 Cookbook for Python Programmers - Third Edition
book

Raspberry Pi 3 Cookbook for Python Programmers - Third Edition

by Steven Lawrence Fernandes, Tim Cox
April 2018
Beginner content levelBeginner
552 pages
13h 58m
English
Packt Publishing
Content preview from Raspberry Pi 3 Cookbook for Python Programmers - Third Edition

Motor speed control using PWM control

Currently, the Rover-Pi robot motors are controlled by being switched on and off; however, if the robot is moving too fast (for example, if you have fitted bigger motors or used higher gearing), we can make use of the ENA and ENB input on the controller. If these are set low, the motor output is disabled, and if set high, it is enabled again. Therefore, by driving them with a PWM signal, we can control the speed of the motors. We could even set slightly different PWM rates (if required) to compensate for any differences in the motors/wheels or surface to drive them at slightly different speeds, as shown in the following diagram:

A PWM signal controls the ratio of the ON and OFF times

A PWM signal is ...

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Publisher Resources

ISBN: 9781788629874Supplemental Content