Another stepper question

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hi folks,

yesterday opened old broken flatbed scanner device, , removed stepper motor 2 uln2003a "darlington arrays". well, thing don't want work...

i used stepper knob example , wired in correctly. unfortunately don't know pinout of stepper motor, has 6 wires, , both red center tap's. that's know far.
well, here's how wired up:




i know looks bit mess, pretty easy: pin 8 11 arduino goes uln2003a pin 1 4 input, , pin 1 4 output of uln2003a goes stepper motor. both center tap wires (red) go +5v arduino.

i used real colored wires stepper motor in schematic. colors are: red (2x), black, brown , yellow.

okay, result: everytime start schematic, motor "wiggles" bit, or moves slowly, wiggling in 1 direction , can stoped touching gently. tried using +9v psu power stepper motor. wiggles around, moves "harder", can't stopped easily. tried switching wires going stepper motor, nothing happens. wiggles around or moves while wiggling.

i confused hell, because ripped of both uln2003a chips pcb of scanner, , stepper motor definately driven these chips.

i hope can me out, don't know do.

thanks :)

hmmm..not sure why might be, way motor has been wired might issue....

when power  up, can rotate stepper hand??  when power up, configured driver, provide voltage , current motor, , "lock up", causes coils in motor activate if will...

does motor lock when apply power?  if not, driver/wiring not done correctly.  also, using separate power supply driver , motor, or relying on arduino supply (bad idea steppers....)

also, need know how can wire up, , differences between unipolar , bi-polar.

have looksy here:  http://www.stepperworld.com/tutorials/pgbipolartutorial.htm  towards bottom of page..it might provide information need make work....


Arduino Forum > Using Arduino > Motors, Mechanics, and Power (Moderator: fabioc84) > Another stepper question


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