Now I am going to use an old stepping motor for Guzunty Pi to drive. I googled images for "tlfong01 stepping motor" and found some of the photos I took way back in 2008, when the first time I played with step motors. I remember I used a multimeter to find out which wire is which, and later assembled a 3p4t or 4p3t switch to simulate the voltages to drive the motor windings, before using Arduino program to do the real thing.
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