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Paul,You mention that for a second stepper the same Pins/logic voltage is to be applied, but I'm not sure how to implement in the code. I've read elsewhere that steppers cannot execute steps simultaneously and they must step one at a time. I'm running a second A4988, that is wired according to your diagram, but, how might I run step exclusive to one stepper or another. Please let me know. Thanks for the tut.