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Cat detector

Discussion in 'Electronic Design' started by Dan, Jan 21, 2005.

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  1. Dan

    Dan Guest

    So my cat sneaks out when people come in/out the door.
    She's an indoor cat, but very sneaky. I don't mind too
    much except when its like -5 out and the wife sends me
    out at midnight to find the stupid cat.

    How can I detect when a cat is in the doorway? I was
    thinking an optical sensor about 5" from the floor in
    the doorway but I don't want it to detect everything,
    just this one cat. Is there some simple detector I can
    make for a simple RFID tag (attached to the cats collar)?
    I don't know anything about RFID tags. Where does one
    even get them in small quanities (other than steal an
    item of clothing with one of them embedded in it)?

    I have read a little online about resonant circuits
    and using a wire loop as part of a detector circuit
    (I guess thats really a simple RFID tag), but I didn't
    find enough info to help me build anything. For the cat,
    I need something thats not powered and small enough to
    attach to a cat collar.

    Any helpfull thoughts?

    Thanks.

    dan
     
  2. Mike Fields

    Mike Fields Guest

    In looking through today's selection of fine junk mail, I came
    across this gadget for $200 that is actually pretty cool and
    comes with 10 RFID tags ..
    http://www.smarthome.com/74342.HTML

    mikey
     
  3. Ban

    Ban Guest

    The range is only 100mm (4")
     
  4. xray

    xray Guest

    I want the same thing for my neighbors cat. My solution requires no
    special equipment to be present in the cat.

    The nasty animal has decided my door mat is a cat scratch toy and has
    taken my mat that had no noticeable wear in 10 years to a worn mess in a
    couple months. I poured ammonia around a few times. It continues.

    Somebody's pet is just a pest to me. Any ideas how to make it go away?
     
  5. Brian

    Brian Guest

    Are you in a police state or in the US?
     
  6. Guy Macon

    Guy Macon Guest

    Yes.

    Are you a primate or a mammal?
     
  7. Zak

    Zak Guest

    Bleach instead of ammonia? High voltage (take care to limit the current
    - and the voltage so shoes are adequate protection :)?


    Thomas
     
  8. Rich Grise

    Rich Grise Guest

    You need to train your wife.

    The damn cat will come back when it gets hungry. It knows where the can
    opener is.

    Let the evil thing go.
    By watching when you go in or out?
    ....
    Yeah. Let the damn thing go. If your wife is _that_ addicted to cat shit,
    then you should let her go too.

    Good Luck!
    Rich
     
  9. Rich Grise

    Rich Grise Guest

    Nah. Just a set of parallel wires, spaced about 1/4", with alternate wires
    connected to opposite sides of the line.

    Or you could trap it and "take it to the pound". >:->

    Good Luck!
    Rich
     
  10. http://www.speff.com/pic09758.jpg



    Best regards,
    Spehro Pefhany
     
  11. I read in sci.electronics.design that xray <>
    Get your own cat.
     
  12. Bob Stephens

    Bob Stephens Guest

    How about those dog collars which give a mild shock if the critter
    transgresses a perimiter sensor?


    Bob
     
  13. Ken Smith

    Ken Smith Guest

    Yes, ideally a large tom short hair semi-wild cat. If you get one as good
    as I had, you won't have trouble with other cats coming in your yard. For
    that matter you won't have trouble with dogs either.

    Barring that, some pet stores sell stuff that cats hate the smell of. It
    seems to really work.
     
  14. Ken Smith

    Ken Smith Guest

    Actually it may not. An in door cat can become lost easily. The the
    outdoors map has not been downloaded into the route finding software.
     
  15. Unless you really want to stick to hightech stuff to
    solve trivial problems, there are more foolprof
    solutions. For whatever reason a cat of mine chooses
    to pee on shoes. So how can I prevent the cat from
    reaching this area ? Since this cat doesn't jump more
    than 60cm, I made an 80cm high gate from some plywood
    that separates this area from the rest.

    No empty batteries and nothing else interferes in this
    aim. Checking whether this gate is open doesn't require
    equipment either.

    Rene
     
  16. Mike Fields

    Mike Fields Guest

    OK, OK, so I went a few pages farther in the same flyer and
    found this gadget for $59 that only responds to your cat ...
    http://www.smarthome.com/6106.HTML
    ( I am always snooping in catalogs like that for ideas for
    cute little gadgets to make for my house etc.)

    mikey
     
  17. Ian Stirling

    Ian Stirling Guest

    Piss on the door.
    (or on the cat, if you can hit it.)
    The smell reportedly deters cats.
     
  18. Don Pearce

    Don Pearce Guest

    No, you go to the local zoo and ask for a bottle of tiger piss. Spread
    a bit of that around and there won't be a cat for miles.

    d

    Pearce Consulting
    http://www.pearce.uk.com
     
  19. Just exactlly how does the zoo collect tiger piss?
     
  20. Don Pearce

    Don Pearce Guest

    Well, it is certainly true that you only take the piss out of a tiger
    once...

    d

    Pearce Consulting
    http://www.pearce.uk.com
     
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