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Refelective sensors — Parallax Forums

Refelective sensors

ArchiverArchiver Posts: 46,084
edited 2002-05-02 22:24 in General Discussion
Has anyone worked with the wedge shaped sensor that utilizes
IR? Electronics Goldmine has them. They look like triangles with the
exception that the point is cut off. I need to detect when a dot or line
has been encountered. I am trying to build a Scantron type machine to read
the dot-to-dots of standard test scoring sheets.

Thanks
Brian

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2002-05-02 22:24
    Yup. I've used the Fairchild units that Mouser sells and Parallax uses on
    their BOEBot line follower board. They work pretty well but can be sensitive
    to I/R from sunlight. The small, rectangular Fairchild sensors seem to work
    better but have to be mounted closer to the surface you want to scan.
    Original Message


    > Has anyone worked with the wedge shaped sensor that utilizes
    > IR? Electronics Goldmine has them. They look like triangles with the
    > exception that the point is cut off. I need to detect when a dot or line
    > has been encountered. I am trying to build a Scantron type machine to
    read
    > the dot-to-dots of standard test scoring sheets.
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