（engraving machine, cutting plotter, textile machine, 3D printe.）
How to use stepper motors from old printers（engraving machine, cutting plotter, textile machine, 3D printe.）
Identifying Stepper Motors
Stepper motors are easily identified by their shape, the number of connecting wires and the vibration you feel when you turn the shaft.
For starters, they tend to be wider and shorter than DC motors. The body generally looks like a flat cannister, while a brushed DC motor is usually longer than it is wide.
Stepper motors will have at least four connecting wires, and as many as eight. DC motors, on the other hand have two wires, and servo motors have three.
Lastly, stepper motors tend to "cog" if you turn them by hand. You will feel a sort of grinding vibration. DC motors usually turn more smoothly.
Bipolar or Unipolar stepper motors?
There are two types of stepper motors, bipolar and unipolar. If the motor has four wires it is most-likely a bipolar motor. If it has more than four wires it is a unipolar motor.
For this tutorial we will be working with bipolar motors.
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