Project help please!

Discussion in 'The Projects Forum' started by SWiFt, Apr 11, 2011.

  1. SWiFt

    Thread Starter New Member

    Apr 11, 2011
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    0
    Hey guys,

    I am working on making an automatic Dog Door, one that will open when my dog walks up to it, but won't open for other animals. I know how to get it to open but I have never done any wireless stuff before. So I was wondering how would you recommend I get the door to detect my dog, I thought about using IR LEDs (on the dog collar) and sensors on the door but that won't really work in bright light.

    As RFID and RF seem like two viable options can you guys link me to a good tutorial or something to get me started as I don't know anything about them.
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,148
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    Have you tried Google? Try "RFID dog door". Lots of stuff to see.

    IR isn't as good a strategy due to the power required to keep the LED lit. With RFID, power comes from the door, not the pet.
     
  3. nerdegutta

    Moderator

    Dec 15, 2009
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    I have a magnet on my cats collar. And a magnetic lock on the door. It's funny to see when my cat is being chased by another, and my cat gets in, but the other don't...
     
  4. wayneh

    Expert

    Sep 9, 2010
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    What detects the cat's magnet? I'm a little surprised this works reliably. Great if it does.
     
  5. nerdegutta

    Moderator

    Dec 15, 2009
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    It's a small metal plate. When the magnet is close enough, the plate is forced to the magnet, and a little hook is letting the door go in. It's all mechanical. When the cat, which has the name Carmen, goes away, the weight of the metal plate is pushing the hook up. The same thing happens with Carmens daughter, Electra....
     
  6. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    You named you cats after Carmen Electra?? Nice
     
  7. nerdegutta

    Moderator

    Dec 15, 2009
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    Well... Um... Oh, I'm so busted...:rolleyes:
     
  8. someonesdad

    Senior Member

    Jul 7, 2009
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    Hey, nerdegutta, did you make or buy your magnetic cat door? I'd like something like that so we can keep the stinking raccoons out of our garage. I don't trust an electrical solution, as I don't feel it would be reliable over a long period of time. But if you can provide some pictures or a link, maybe one of us could design one (that's always more fun than buying one).

    Hopefully, this is enough on-thread to not be considered hijacking... :p
     
  9. nerdegutta

    Moderator

    Dec 15, 2009
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    Hi,

    It bought something this.
     
  10. SWiFt

    Thread Starter New Member

    Apr 11, 2011
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    0
    Thanks for the replies guys.

    You have a magnet strong enough to do that from that distance? What kind of magnet is it?
     
  11. nerdegutta

    Moderator

    Dec 15, 2009
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    It's a small magnet on the cats collar, and when the cats stick their heads in, and start pushing the hatch, the magnet is maybe 2-3 cm from the metal plate.

    It's working great. :)
     
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