>There is a method which may be simpler than building a >frequency counter per se with a PIC. Briefly, don't measure >what the motor is doing - instead, tell the user what YOU >are MAKING the motor do. How does the controller know if the stepper is actually turning at 'any' speed ;-) Tony PicNPoke Multimedia 16F84 Beginners PIC Tools. PicNPoke - PicNPlay - PicNPlan - PicNPrep - PicNPost Plus DT type saver. New addition - PicNPort I/O Tutor. http://www.dontronics.com/picnpoke.html