NOTES

Notice the polarity of the clamping diodes on the upper right.

The two rightmost stepper wires are connected to +V

Regulated +5VDC Power Supply

ULN2075 DataSheet
PBasic program

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Unipolar Stepper Control  
ULN2075 Darlington Array

The Stepper is controlled by a 200K pot and pushbutton switch.
Moving the pot determines the motor direction and distance.
The pushbutton controls speed.
Video

Here is a simpler program just controling the direction and distance:
PBasic progam