Stepper motors seems to be always interesting topic. And there is a lot of information about controlling them around the internet. Albert La also has been playing with steppers using PIC microcontroller.
He constructed simple circuit with PIC16F84 microcontroller, TIP120 Darlington transistor pairs, and 4050 buffer IC for circuit protection. Wrote simple program which is able to run stepper motor with 7.5 degrees per step. This circuit can serve as stepper motor tester for instance picking right wiring, measuring revolution speed and so on. [via]