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RFID - tag detection, don't need ID

Discussion in 'Electronic Design' started by BOOT, Oct 10, 2004.

  1. BOOT

    BOOT Guest

    Maybe there is another way to do this.

    I am looking to build something that will detect the presence of a small tag
    (RFID?) when it passes within 5ft.

    I don't need an ID, I just want to detect the presence of such.

    Perhaps there is another way to do this which does not involve RFID.

    What I am trying to do is detect the removal of something (say clothing
    item) from a room that I can place a small/unoticeable tag or such inside.


    Thanks for any help!
     
  2. Ian Stirling

    Ian Stirling Guest

    What's wrong with anti-theft tags?
     
  3. BOOT

    BOOT Guest

    I am ignorant of the technology and suspect that what I am after is
    something simpler (earlier technology?) The simplest anti theft tag I have
    ever seen looks like a wire strip. Is this indeed considered an RFID? I
    guess I need some more google time. If it's not an RFID, are the square
    stickers with copper traces RFIDs? How about the small rectangular package
    like stickers? I am thinking that RFID implies the ability to uniquely
    identify a large variety of items and that there is actually machine
    readable code invovled.

    This may sound funny/way over the top but I am trying to come up with a way
    to catch a laundry room thief stealing from a shared launtry facility. I
    figure if there was something small I could plant inside a clothing item and
    hide a detector near the exit that would alert me. If it cost me $150 it
    would be worth it LOL.

    Any ideas appreciated!
     
  4. BOOT

    BOOT Guest

    After further reading it is and EAS device, either AM(Acousto-Magnetic),
    EM(electro-magnetic), and RF(Radio-Frequency) I should be looking at
    probably?

    So any suggestions of an easy to put together solution?

    Thanks!
     
  5. Ian Stirling

    Ian Stirling Guest

    Hidden camera + motion detector to activate tape.
     
  6. Andrey

    Andrey Guest

    Some libraries still use permaloy strips or more complex arrangements of
    dissimilar metals. These things can be magnetized and de-magnetized. Making
    such a tug will be simple. You will need a reader though - this will be
    trickier

    Andrey
     
  7. reboot

    reboot Guest

    Thanks guys.... the camera+recorder is impractical due to cost and having to
    hide it etc...


    Andrey I am interested in that suggestion. Where would I start with this?
     
  8. Ian Stirling

    Ian Stirling Guest

    If you want to go low cost, there are a number of low-end cameras,
    with a "spycam" mode, that can take a picture every 10s for a few days.
     
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