No, I think that once I have the control program burned on the Pic it will control the projector and the stepper motor with pulses from within. The projector will need a digital pulse to advance the slide show for a number of milliseconds and the controller will count the slides to 0 and stop. The stepper motor will control the thickness of every slice and keep the resin in motion. I wanted to write the initial numbers at the eeprom en case the power is lost the program will read the number of slices and subtract a unit every time it read it and remember the thickness also. One print will take hours to make and you don't want to trash an almost finished part because of power failure. The program will have that contingency on it. I think the rest will be very easy once I finished the programming and test it for bugs. Thanks