I’m trying to get a pair of A4990’s to drive a pair of stepper motors.
When I load a minimal bit of code, I can get the motors to lock up exactly the way you would expect. However, when I include a line from the stepper library to get the motor to actually move, the motor neither locks nor freewheels. It acts as though it’s getting strange signals. Resistance feels “grainy”.
Reading through this thread: A4990 Pin Question, I’m led to believe the stepper library would need to be edited to feed the proper sequence of signals to the A4990.
Am I way off base here? Opinions? Suggestions?