Microstepping steppers, and driving steppers with Raspberry Pi

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Examining the microstepping capabilities of TB6600 and TB6560 stepper drivers. I have these hooked up directly to the GPIO lines of a Raspberry Pi 1 B+. The micro steps are not all the same size on account of nonlinearities in both the motor and the stepper drivers, though with the right combination of driver and motor, the micro steps are fairly even.
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