Known for its high current and high voltage capacity, the
ULN2003 gives a higher current gain than a single transistor and enables the low voltage and low current output of a microcontroller to drive a higher current
stepper motor. ... Hence,
we connect this IC to source for enough current and voltage for the
motor.
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stride angle means the the degrees per one step but in half step mode not the full step one, and since the gear ration is 64 so the final number of steps per rotation in full step mode is 2048 step and in half step mode is 4096.
