Just finished my new Motion Control Unit for the circular and linear tracking dolly. I’ve did the holes, buttons and engraving with my little cnc machine. The electronics fit perfectly in the case and everything is tidied up. A big thanks goes to Duncan Frazier for the arduino code. It contains a TimeLapse & Slider mode. The 9 pin SUB-D jack connects to the stepper motor of my dolly and the mini jack goes through an adapter cable to the Canon camera. Now I have to adjust the code for my stepper motor to work properly.