speed of the d.c. motor is controlled by using ATMEL89C52 lmicrocontroller ,feedback from optocoupler. the circuit diagram can be seen above(click on the diagram to get larger view)
the motor speed is controlled by the use of transistor as control switch
varying the dutycycle of the switching signal to the transistor varies the power of the motor.
the operation is quiet simple,with the help optocoupler speed is measured and will be in digital form so can be given directly to micro controller .microcontroller sends the control signal to uln2003 which magnifies current and causes the variation off duty cycle . inthis way speed off d.c motor can be controlled. with lcd display we can see the speed also.
the motor is a small d.c motor .
by writting suitable code ,you should successfully control the speed of the motor
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