Is that a rom in your locket?

[Andrew] recently ordered some lockets to bejewel them with some LEDs but got a bonus small locket for free with the order. Not really having a plan for the small locket it kind of sat around until finally some inspiration hit. Meet the ee-locket which contains a tiny circular pcb with a 64k eeprom, a few passive support components and a male pin header on the back so you can quickly plug it into the micro of your choice.

While the uses of such a thing may not be obvious at first, just sitting down writing this I thought of a few applications, such as some form of key and lock system, mission impossible dreams, or just going full out geek at your next job interview. Its a pretty spiffy idea no matter what its used for, and we just love it when people shove electronics where no one expect them.


  1. Mike says:

    Is that a male pin header in your pocket or are you just glad to see me?

  2. liard nelson says:

    oh, look at my new locket, i am so steampunk! doh.

  3. HAD says:

    iButton does the same thing and has water/dust proofing.

  4. DJ Charlie says:

    @liard nelson: Funny, I see no mention of Steampunk anywhere in the article, or this post.

    May I suggest getting your glasses check and/or cleaned?

  5. b says:

    “we just love it when people shove electronics where no one expect them.”

    That’s just not right.

  6. Steve McCool says:

    “and we just love it when people shove electronics where no one expect them.”
    I’m sorry, is it just me or does that sound so dirty 3:)

  7. pin says:

    it kind of looks steamish

  8. liard nelson says:

    yes, it looks really steamish. maybe reversed steampunk’d. Instead of adding useless shiny metal to working hightech, we see the adding of practically useless shiny hightech to shiny metal jewelery.

  9. Spork says:

    Looks cool, but is not very functional for anything. Why not make a flash drive locket with a micro usb port or something?
    Also, what kind of dude wears a locket?

  10. The Ideanator says:

    ^ CyberSteam?

  11. Microguy says:

    I wonder how hard it would be to put a small micro in there, and a small color LCD. So when you open it the picture of your loved one pops up. Kinda like those tiny photo key chains.
    I may just have a project…..

  12. mjrippe says:

    “we just love it when people shove electronics where no one expect them.”

    Sounds uncomfortable!

  13. Hirudinea says:

    Load a PGP key onto the eeprom.

  14. N0LKK says:

    I’m sorry if I’m missing something, but what does it do, other than store data in an EEPROM? Why not stick a micro-SD card inside the locket, something that many devices that can make use of?

  15. Aaron says:

    Spork: Dudes don’t wear lockets. Men wear what they damn well please.

  16. Dacap says:

    I didn’t know you could reuse surface mounted items like this. if anything props for recycling?
    perhaps you could get it to log hiccups

  17. becky says:

    You could give it to your geeky wife as an anniversary with something special like poetry on it.

  18. N0LKK says:

    @becky So are you that geeky wife?

  19. Necromant says:

    microsd did not fit in.
    I use the eeprom to store the private keys for ssh. And, frankly, put the whole whing onto the usual keychain

  20. Necromant says:

    @becky I’m not yet married (that’s why I do have some time for this). But you are kind of right: the locket with leds will be a present =)

  21. cde says:

    Should have turned it into a passive rfid rom, or an ibutton or something.

  22. steve says:

    What a steaming pile of punk.

  23. Mad Max says:

    Yup, I’d go with the RFID version too. At least it would be usable in some vaguely magic-looking sort of way to open stuff. There might be problems with the medallion shielding the antenna though…

  24. Necromant says:

    I thought about that, and I even tried. But mifare antenna just didn’t work (I think I even know where the bug was) and soldering aluminium (I salvage mifare ultralight chips from metro tickets) is kind of tiresome.
    Maybe some time later. So let it be eeprom this time.

  25. Microguy says:

    I re-use surface mount stuff all the time. You just have to be careful when removing it.

    In fact, I can’t think of anything I re-used, that didn’t work, because I was too rough when removing it. Electronics parts are not the fragile little beasties lots of people think they are. Most are pretty sturdy.

  26. NATO says:

    Considering that you can’t protect this EEPROM, using it for any type of security would be, well, not secure at all.

    Also, this SOIC package is way too big – Why not use something smaller?

  27. Eirinn says:

    Locket looks steampunk, the insides does not.

    Neat projekt :)

  28. Necromant says:

    @NATO: Well. The only reason I used it – I had it around. I’ll be experimenting more with mifare later, may be RFID will eventually work out.

  29. NATO says:


    Neither is secure. Look around, maybe something MCU based…. There are secure (relatively speaking) solutions out there.

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