I'm pretty new to arduinos and I'm trying to get a stepper motor moving. I got an Airpax 12V stepper that I can't find any data sheets for. I used an multi-meter to find the leads using the method from this site http://www.me.umn.edu/courses/me2011/arduino/technotes/stepper/index.html
I ordered some darlington ULN2003AN transistor array chips and hooked everything up through that with a 9V cell phone transformer (my meter tells me that it actually provides about 13V).
Here's the code that I used, it's simple and there were no obvious problems with it.
#define STEPS 48
Stepper stepper(STEPS, 4,5,6,7);
I'm trying to just get this motor moving before I try to do anything with it but when I hook it up to the power supply and start the arduino, the shaft just jiggles. It jiggles in spurts twice, then jiggles a little faster leading me to believe that the code is reaching the
motor, but something's not working and I can't figure out how to trouble-shoot the problem. The transistor array also gets real hot real fast and that doesn't seem quite right. Any thoughts or suggestions would be greatly appreciated.