On Thu, Jul 16, 2009 at 6:01 AM, Alan B. Pearce wrote: > Hey, thats a good idea - just what one needs to build a pick-n-place machine > for PCBs ... > Based on the use of fiducials, I'm guessing modern pick and place machines use cameras for "vision." Take a picture under high contrast and run an edge detection algorithm. XOR this with a known picture, add up the remaining black pixels, and you know if you're in the right spot. Just a guess. -- Martin K. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist