Stepper Motor not rotating (oscillating) in a particular range of speed (100-150 RPM)

Hi, @sat20
Welcome to the forum.

Thanks for using code tags. :+1:

Can you please post a circuit diagram of your project.
An image of a hand drawn schematic will be good, please include all power supplies, component names and pin labels.

Can you post links to stepper and driver units spec/data please?

Thanks.. Tom.. :smiley: :+1: :coffee: :australia: