I am using an arduino uno, with an adafruit motor shield v1.2, (2) 200 step bi polar stepper motors (Pololu - Stepper Motor: Bipolar, 200 Steps/Rev, 35×36mm, 2.7V, 1 A/Phase) and 4 momentary push buttons with leds (http://www.exp-tech.de/accessories/Button-Switch/Waterproof-Metal-Pushbutton-with-White-LED-Ring-16mm-White-Momentary.html)
I have written a code that will spin both motors simultaneously (or alternating one step at a time) a certain amount of steps when each button is pressed to reach the desired position. Everything works perfectly when i have the USB plugged into my computer and even when i remove the USB and connect a battery pack with 6 AA batteries to the motor shield.
The problem is the batteries die rather quickly, so i want to just plug it into the wall to power everything. I have tried 3 different DC wall adapters and each one does the same thing. When the button is initially pressed, everything seems to be working fine, however after about half a rotation the motors become very jerky, as if they didnt have enough power to spin the gear.
these are the specs for the wall mounts. i used the 9V 2.0A, 12V 2.0A, and the 12V 2.5A
Any and all help is much appreciated. Thanks in advance!!