You can get reflective optocouplers as well as transmissive ones, although using a disk as you describe it might require an analog comparator on the front end to clean up the signal. Transmissive is easier, since the only linear part is at the edge of the openings.
You can get reflective optocouplers from both mouser.com and and digikey.com. Javid ----- Original Message ----- From: "Alex Joni" <[EMAIL PROTECTED]> To: "Enhanced Machine Controller (EMC)" <[email protected]> Sent: Friday, February 16, 2007 3:17 PM Subject: Re: [Emc-users] Home Made Encoder Ideas >> One method might be to use Lighscribe to burn a rotary scale image >> to a >> CDR disk, but cd's are reflective and practical encoders need to be >> transmissive. Maybe an emulsion used for circuit board etching could >> be >> used on a clear CDROM? Two disks would be needed, one for the scale >> and >> another for a mask. > > well, if you're already acustomed to lightscribe disks, look at the > inside of the disk. > You'll see markings that are perfect for an encoder, you just need to > find (mouse?) 2 optos to work with that. > > The markings are pretty visible in this picture I took: > http://dsplabs.cs.utt.ro/~juve/dropbox/lightscribe/IMG_9645.JPG > > Regards, > Alex > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share > your > opinions on IT & business topics through brief surveys-and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
