I am new to electronics and trying to build a robot that uses 6 stepper motors. I bought 6 of this stepper motor and used Pololu stepper motor driver A4988 to drive them but I have an issue with the power supply. The datasheet says that the motor operates at 12V , 0.33A current. My application requires that only one motor works at a time, no overlap between any 2 of them, so I assumed that a 12v 1A battery will do the job.
I connected the circuit with Arduino for 1 motor and powered it with the battery and it worked well, but when I connected all of the 6 motors, no one worked, instead, I heard some noise for 2-3 seconds.
When I tested 1 motor, I noticed that when the motor is powered -not receiving commands from Arduino yet to move- the shaft is holding -I can't rotate it with my hand- so it seems that it is drawing current and when I connect all of the 6 altogether without moving, they require more current than the battery provide.
So I think that the motors did not work because I mischoosed the Battery, if so, I need your help to choose the suitable power supply please. Any help will be appreciated. Thanks a lot.