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The 28BYJ-48 stepper motor with a ULN2003 driver board is readily and cheaply available on eBay. With nothing special in mind, other than curiosity,  I bought one and had a quick play with it, using the standard Arduino Stepper library. I managed to do little more than demonstrate that I could make the motor rotate, before I had to put it on one side because of other demands on my time.. Moving on several months to Christmas, my wife bought me a Lego Technic kit  as a joke p ...