15 Dangerously Mad Projects for the Evil Genius by Simon Monk

Author:Simon Monk
Language: eng
Format: epub
Tags: Personal & Professional Development
ISBN: 9780071755689
Publisher: McGraw-Hill Education TAB

Motor Controller

PWM stands for pulse width modulation, and refers to the means of controlling the amount of power delivered to a motor in this case. We use a simple PWM controller built using a 555 timer IC. We will meet the 555 timer again in Chapter 12.

PWM controls the power to a motor by lengthening or shortening pulses of power that arrive at the motor. You could imagine this as a child sitting on a swing. If you just give the child short pushes, they will not swing as high as if you give the child a longer push.

In a motor, the motor either receives full power or no power, in pulses that arrive at perhaps a thousand times per second. The motor has no time to fully stop when the power is off, so the overall effect is that the speed of the motor is controlled smoothly.

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