[MOVED] Designing a stepper motor controller NEED URGENT HELP!

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Ahmed Malik

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I have to design a stepper motor controller circuit in which i enter the number of degrees i want the motor to rotate CW or CCW. (input can be in binary). The entered input number of degrees can be a multiple of the degrees in one step of the motor.
Please help me in designing this circuit. I dont know much about stepper motors and their working. Thank you
 

For understanding Working of stepper motors prefer following page::
**broken link removed**

if you need more insight then read this::
gyan.fragnel.ac.in/~dileep/stepperworking.pdf‎

To drive a Stepper motor you need to have large current but controller doesn't have ability to source more than 25~30 ma current. So, you need motor driver (ULN2003A) is best for driving stepper motor.
 

I would advise a unipolar stepper motor with 5 leads to be used with UN2003 / 2803.
 

This sounds like an open loop controller. If the motor misses a step, you need some mechanism for the motor and the software to get into step again (sorry about the pun), this can happen when you first turn ON if the motor is not sitting at zero degrees. So the first bit of your software, could be to run the motor to the zero degrees position, which closes a switch to tell the processor to go to the main loop.
Frank
 

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