Hi Ryan and Ben
I calibrated the motor according to this guide
A4983 and A4988 Getting Started Guide.
I am using 1/2 steps to achieve 50 rpm.
Things seem to work fine till 15 rpm. I increase the rpm by decreasing the time delay between the low to high transitions. I checked it with a stopwatch and an encoder. Will also post the code.
My voltage input going into the vmot pin during calibration and during runs is 12V DC
Thanks
Sam