RFID Keepsake Box is Sweet and Secure

box-tag-top

[Mike Buss] wanted to make his girlfriend something unique for her upcoming birthday — she had mentioned she wanted something to keep small mementos in, but [Mike] decided to step it up a notch on the awesomeness scale.

You see, a few years ago [Mike] read about the Reverse Geocache Puzzle by [Mikal Hart], which is an awesome box that gives you feedback as to how far away you are from the “secret” location that the box will open at — To raise the stakes however, if you ask for the distance more than 20 times it locks itself forever! Now, unfortunately, a memento box wouldn’t be very useful if you had to go to a secret place every time you wanted to open it… so [Mike] decided to secure it another way, using RFID!

It makes use of an Arduino, a Parallax RFID Reader, a micro servo, a button, an RGB LED, and a cleverly designed latch made of a metal eye hook and small copper rod. Since the box is battery powered, [Mike] has added an extremely clever fail safe mechanism. The 9V battery inside includes two extra contacts to the outside of the box via small screws. Completely inconspicuous, but if the battery is dead, simply hold a new 9V to the screws with the RFID card in place, and bam, the box opens!

We’re pretty sure she’s going to like it — check it out after the break!

Comments

  1. Eirinn says:

    I like the 9v recovery option with the screws :D

  2. SB says:

    i Think this is a fantastic idea.
    One that i would like to recreate…
    MIke how do i go about making one?

  3. ADC says:

    He could have used the illuminated button led as indicator

    • mikebuss says:

      I was originally planning to, but found the viewing angle of the LED in the button was a little weird. If you were opening the box up from a normal angle, the button LED is a little hard to see.

  4. Salokcin says:

    What’s the fail safe for when she loses the RFID card in the abyss that’s likely her purse? A screwdriver under the lid?

  5. Ian says:

    I was disappointed that the polarity of the external battery terminals was not indicated by using different screw drives. There are two very common ones that look like a plus and a minus…

  6. atalax says:

    Not really sure whether I would call using RFID secure, especially as the ones used even don’t try to do any cryptography to prevent cloning. The box itself looks awesome though.

  7. FrankenPC says:

    Those rfid tags are really small, yes? Are they small enough to put in jewelry like a necklace or ring?

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