Sure you can go out and buy an automatic car door that opens when your cat gets near it, but that requires your cat to wear a special collar and you need to keep the batteries in the collar in check. Since most pet owners already have identification RFID chips injected into their cats, why not take advantage of them.
By using an Arduino and some inexpensive parts, Instructables user landmanr put together a cat door that reads the cat’s RFID tag within 4-inches and unlocks the door. The code can distinguish between different RFID tags and can act accordingly. It’s simple, effective and well built. All he is missing is an enclosure to protect the internals.
[Link to RFID Cat Door]
HowTo: RFID Cat Door originally appeared on tech.nocr.at on 2011/01/24.
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