Omega Software wrote > Does my design makes sense? If you have not, do some research into FSO (Free Space Optics) just to get a sense of some of the problems it has to contend with -- and it has the advantage of using lasers (versus what you are proposing: a non-collimated light source). Regards, Ken Pergola -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics