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universal learning key fob

Discussion in 'Electronic Design' started by DJ Majestik, Feb 18, 2005.

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  1. DJ Majestik

    DJ Majestik Guest

    Wondering if such a device exists. If this is the wrong area, please
    point me in the right direction.

    I have multiple key fobs on my key chain (for car, open home door, etc)
    and I was wondering if there is a product that is a learning key fob so
    that I could have it learn the multiple signals from my key fobs, and
    that way I would only need one. I would need something with 4 or more
    buttons on it.

    Thanks for any help you all can provide,
    Jimmy J
  2. Guest

    No it doesn't. These devices use different protocols and different
    frequencies. It would be *EXTREMELY* difficult to design a receiver
    that could learn all the different devices, and it would be
    prohibitively expensive to build a transmitter that could send all the
    different frequencies. Plus, the thing wouldn't fit in your pocket.

    It's not like infra-red at all.
  3. The differences in carrier frequency are fairly easy to work around. But it
    goes further than that.

    Aside from the protocol differences, there are encyrption algorythms that are
    required for the rolling code keyfobs, as well as some duplex comms keyfobs
    that talk both ways. You'll never get access to this information. Not without
    some reverse-engineering anyway.

    Like a true 'universal key' for house door locks, picks need some skill to
    use. Sometimes a big hammer is faster and more cost-effective than picking the
    lock. After all, not all theives are concerned about damage.
  4. I read in that wrote (in
    Quite right. But available by mid-year in the dollar store, if the
    demand is big enough. (;-)
  5. Jim Thompson

    Jim Thompson Guest

    I've often pondered using a universal IR remote with an IR receiver to
    activate *each* of the RF remotes.

    ...Jim Thompson
  6. Joerg

    Joerg Guest

    Hello Lewin,
    Even with IR the matter isn't trivial. We had the IR for our VCR croak a
    couple months ago. Big deal, I thought, and cracked out the "universal
    remote". After a bit of fiddling I was able to squeeze the best possible
    compromise out of it but it will not work for everything the original
    VCR could do. For example, to get the VCR into programmed recording we
    now have to hit a button on the VCR itself.

    Regards, Joerg
  7. DJ Majestik

    DJ Majestik Guest

    Thanks a lot for all the replies! Definitely something to think about!

    JImmy J
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