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Stepper can rotate 90 egrees or 180 degrees by providing the windings appropriate pulses at the appropriate time. Visit Fun with Electronics for more details.....mail me at firstname.lastname@example.org if u need more help. If u need only 90 or 180 degree motion that is the motor shud stay at 90degree or 180 degree position....then u can also try servo motors
i need the motor to rotate 90 degrees or 180 or 270 degrees but i need to know the function of the pins from the stepper side and also from the pic16f877a side (when using ULN2003A as a driver for the stepper motor ) so i can write a good code using microbasic language can you help me with that?i think you should lock again to the schematic digram ihave been attached so you could anderstand me!