I think two sensors beside one another is enough to find the direction of rotation. At some time both will be sensing the same color but when there will be change of color below one of the senser, after some time same change will be below other one, and from this we can say that the direction of the disk rotation is from first senser to second senser direction.
hope i am clear... -- Regards Jitendra Kushwaha MNNIT, Allahabad -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.