Whilst no extra hardware at all is attractive, at £0.51 (60 cents?) per chip (£0.25 per motor) the ULN2803 will drive steppers at up to 50V / 500mA in Unipolar mode at very little cost.

14. When faced with an unknown stepper motor of small to intermediate size, a very reliable gamble to play is as follows: if it has more than four wires, it's probably a four-pole unipolar motor, 0.9 ...

BTW, the inputs in the associated motor drivers are opto-isolated and so ground lops will not be formed with the HC245 outputs. 32bit disappointment? The glee was slightly tempered by disappointment ...

The Arduino-based evaluation kit (EVK) is said to supports the evaluation of ROHM Semiconductor’s motor driver devices and enables, facilitates and accelerates customers’ developments. Designed as a ...

Check out this inventive use of an MCU and stepper motor by one Alan Parekh. This great looking gear clock tells the time in a unique way. A PIC 16F628A microcontroller with an external 20MHz crystal ...