stepper motor control

[navkram]

Looking to control 1 stepper motor. All it has to do is variable speed, 1 direction no feed back at this point.

12V power in.
On/off switch
Knob to control speed.

Cheapest way.

[BeeAmaker]

How many amps do you need?
www.robotshop.com/en/pololu-single-bipolar-stepper-motor-driver.html
That one is 2 amp. You can use a Pro-Mini to control it or possibly a digital type (PWM) dimmer to control speed.