In this video Dilshan Jayakody demonstrates his open hardware project the LMD18245 micro-step stepper motor driver:
This article describe the LMD18245 and PIC16F877A base 16 step bipolar stepper motor driver which is design to work with 12V 18º bipolar stepper motors. In this design we use pair of LMD18245 DMOS full bridge motor drivers to control 2 phases of the stepper motor and PIC16F877A MCU is used as controller.
Project schematics and firmware source codes can be found at elect.wikispaces.com.