Hi guys,
I need assistance from you all in driving my unipolar stepper motor. The stepper motor requires around 1A of current through their coils. The Vstepper should be around 12V. I planned to build two drivers, for my bigger and smaller stepper motor (2A and 1A coil current).
What I have now on my table:
-L297 chips
-TIP110 NPN Darlington 1A
-TIP120 NPN Darlington 2A
-ATMega 8535
I googled some designs and found this one:
**broken link removed**
I wish I could drive my unipolar only with L297 (without L298) and TIP110/120 according to my motor size. Is it possible?
What should I feed on the CLOCK pin? I read the similar thread in this forum and some guys fed up with 555 timer IC, I need to interface with microcontroller so what is the best approach here?
NOTES:
I have tried the schematics at that website (given above from wiki), but my stepper motor doesn't run at all. The high pitch sound is generated and I couldn't turn the shaft of the motor with my fingers, say it has holding torque in it. I don't know why, maybe you guys could figure it out?
Help me.
Best regards,
Kelvin