DVD laser pickup has everything for reflective surface focus measurement. Focus output is analog signal from 4-quadrant detector. Just glue focusing coils and servo Z to focus.
http://www.gaudi.ch/GaudiLabs/?page_id=652, google reveals quite a lot of other interesting projects ... Regards, Petr Ledvina -- Ing. Petr Ledvina ekoTIP ID s.r.o. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
