Pwm Dc Motor Speed Control Circuit. Pwm is basically pulse width modulation and if you re new to this please go through our basic guides pulse width modulation and other pwm articles. In following schematic ic 555 timer acts as a pwm generator and h bridge motor driver ic l293d takes responsibility to drive motor depends on the pwm input signal.
A pwm dc motor controller technology is used to control the speed. Here motor rotation direction can be changed by changing input pins. The variation in speed is achieved by varying the duty cycle of the pulse supplied to drive the motor.
How speed control of dc motor circuit works.
Apart from these techniques pulse width modulation is the effective way to implement motor speed control. This 555 timer circuit also can be use as the led dimmer circuit. The circuit is very simple i have used 555 ic and some basic electronics components to make this speed control of dc motor using pwm. In pwm the arduino sends a pulsating wave that is similar to astable mode of 555 timer ic.
