• DB9 serial connector goes here, so I can reprogram the microcontroller without having to take it apart and pull the chip out.
  • Power
  • Power switch
  • Override switch
  • Yellow - reading tag
    Red - tag rejected
    Greed - tag accepted

RFID closed

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This is a project that never quite got finished. The goal was to make a dog door for my dogs that would unlock only for them and not other dogs, skunks, coyotes, etc. So I built an RFID reader that could detect a tiny tag on the dogs' collars as they approach and unlock the door for them. Problem is, I could never get enough range out of it to be practical. I got about eight inches and I want 2-3 feet. The RFID chip is very sensitive to the resistance and impedance of the antenna (wrong values can even damage it), so changing the antenna myself without knowing a lot more about RF engineering than I do is impractical.

BIUS, thor83, tlossen, jspaw, and 2 other people added this photo to their favorites.

  1. Scammah 116 months ago | reply

    Wow you are a brilliant person. I wish I had the skills to do something like that, even if you didn't finish it

  2. _escalade328s_ 116 months ago | reply

    that is genious. you could sell this for a fortune. you should go patent the idea, someone will steal something so brilliant.

  3. AMagill 116 months ago | reply

    Thanks! Unfortunately this has been done. A company (now bankrupt, I believe) used to sell a system just like this, plus the door and locking mechanism and everything.

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