Wait, I have dealt with "Stepper Drivers" and also directly interfacing to unipolar and bipolar stepper motors. What is it exactly that you have and how is it labeled? On Wed, 19 May 1999, Lau Chi Cheung, Samuel wrote: > Hi, all > > I have used a PIC16C74 20MHz microcontroller to control > two stepping motors. > > Could you help me how to control these motors with 4 control > signals (two are for output pulses from 100Hz to 300Hz and > the other two signals are for direction control) > > Thanks, > Samuel Lau >