Greetings, Thanks for heads up. Back 2002 I tested the main part of circuit using a micro interface, worked well. I still have to do some testing using the light sensors. I am using a cnc router to make the pcb's. I viewed a video on you tube where a bike chain and sprocket is used to create a gear set for the motor interface. This will make fabrication very easy and is what sparked my interest in this project, well that and the cold weather. Cabin fever. Thanks again and best regards.