I’m trying to drive a CDROM stepper motor (4 wires, ~10 ohm / coil) with Arduino through A4988.
On delay less than 1 milisecond the motor is working, but i think it miss some steps.
When delay is more than ~ 1.5 milisecond the motor is not running (i can hear only some buzzing) and on increasing the voltage from trimmer the buzzing became high pitch squeal.
I changed the wires from A4988 to the motor, change A4988 power supply (from 12V/1A to 9V battery), powered Arduino from USB or from separate power supply but i get the same results.
What else should i try ?