Help with steppermotor

Other Hardware Motors, Mechanics, Power and CNC
6

Hey.
using the exact same motors.
using optocouplers and IRFZ44N MOSFETS at 12V with current limiting resistors.
no way your uln28004 will work. Can look at my implementation if you want http://rhysmossom.com/2013/09/01/arduino-v-plotter/.