I'm powering it with 12V, as necessary, and have the four wires from the stepper going into pins 8-11.
OK, so before I deal with building a driver from the 754410, can I just plug the stepper wires into pins 8-11, use the 5V from the USB power, and test it that way? I was experimenting with 12V only because that's what the motor's rated for, and I was thinking that perhaps some of my problems were coming from insufficient voltage to the motor.
QuoteI'm powering it with 12V, as necessary, and have the four wires from the stepper going into pins 8-11.Stop right there. That arrangement will damage your arduino from both excess current and excess voltage.You need some sort of driver.
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