Controlling stepper motor using 2 pins on pic - Electronic Circuits Projects Diagrams Free

bloody-orc · 4th March 2005, 08:22 PM

I'm trying to control stepper motor using ULN2804 and a pic.
I want to use 2 outputs on pic cause i need to drive 2 motors and i have only 8 outs

so I have constructed one of the circuits, but it seems to not work(it worked when i made it in my PC(simulator) but not in real life...

:x )

motion · 6th March 2005, 06:58 AM

What does not work?

Try inserting a 12V zener diode between (cathode here)pin 10 of the 2803 and the 12V supply (anode here). This will increase the rate the current decay rate which should improve motor performance.

Since you're using just 2 pins, the motor is forced to run in full-steps only which will increase the chance of resonance.

Lastly make sure you've got the motors wired correctly.

bloody-orc · 6th March 2005, 09:04 AM

well if i use this schem the motor steps in one posicion(one fwd, one rev)

the morot is wired correctly(tryed running with 4 pins and all ok) and the zener soldered in place

also you could give me a pic program how to control this(not compleat, just how the pins should be high\low in sequance)

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6th March 2005, 06:58 AM	(permalink)
motion	What does not work? Try inserting a 12V zener diode between (cathode here)pin 10 of the 2803 and the 12V supply (anode here). This will increase the rate the current decay rate which should improve motor performance. Since you're using just 2 pins, the motor is forced to run in full-steps only which will increase the chance of resonance. Lastly make sure you've got the motors wired correctly. __________________ "Having to do with Motion Control"

6th March 2005, 09:04 AM	(permalink)
bloody-orc	well if i use this schem the motor steps in one posicion(one fwd, one rev) the morot is wired correctly(tryed running with 4 pins and all ok) and the zener soldered in place also you could give me a pic program how to control this(not compleat, just how the pins should be high\low in sequance) __________________ Need Help? Press F1 If that doesn\'t help you, ask me... I might know better.