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once more me. Currently I am fiddling around with the motors:

Could you please tell me (us) what cable color (from the motor) you connected to 1A 2A 1B 2B at the A4988. I did the hack -> turned down the voltage to absolute minimum. When going up with the voltage the humming gets "stronger" but somehow I cannot get the motor to move.

BTW: Maybe someone is interested: The "easydriver" wont move the BYJ28-5V motor at 12V you need to "step" down to 5V. If you use the A4988 it works with 12V (but as said above, currently I can not make the motor to move).