People, I have put up a description of a stepper motor controller that I developed. It uses a 12c509 to give half-step resolution for small motors. http://www.beowulf.demon.co.uk/stepper.html for the circuit and code Pete .............................................................................. . Never trust a man who, when left alone in ....... Pete Lynch . . a room with a tea cosy, doesn't try it on ....... Marlow, England . ..........Billy Connolly. ......................... pic@beowulf.demon.co.uk ..