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Thread: Key fob

  1. #11
    Join Date
    Jan 2011
    Location
    uk
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    774
    Quote Originally Posted by Mjolinor View Post
    Well I just powered a key up from a power supply and frequency does not drift at all. At around 2 volts it stops working.
    Which model ?

    Iíve read it somewhere (the freq shift thing), long time ago ... reputable source.

    The rolling code stuff etc is all legit
    You're so money supermarket and you don't even know it!

  2. #12
    Join Date
    Mar 2012
    Location
    Burnley
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    1,270
    450. I only have one key for my 451 so I aint about to use that.

    I have a couple of 451 keys somewhere, I will find one of those and look at it. This 450 key is using FSK, I don't think the 451 will be any different.

  3. #13
    Join Date
    Mar 2012
    Location
    Burnley
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    Datasheet for chip in 450 key.

    I can't attach it, the forum will not let me.

    http://pdf1.alldatasheet.com/datashe.../U9280M-H.html

    I think I read it in here somewhere a few years ago that bits were set for battery state but I can't find it now.

  4. #14
    Join Date
    Jan 2011
    Location
    uk
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    Quote Originally Posted by Mjolinor View Post
    Datasheet for chip in 450 key.

    I can't attach it, the forum will not let me.

    http://pdf1.alldatasheet.com/datashe.../U9280M-H.html

    I think I read it in here somewhere a few years ago that bits were set for battery state but I can't find it now.
    More direct route to the sheet

    http://pdf1.alldatasheet.com/datashe.../datasheet.pdf
    You're so money supermarket and you don't even know it!

  5. #15
    Join Date
    Nov 2013
    Location
    Central Scotland
    Posts
    428
    Quote Originally Posted by Mjolinor View Post
    I replaced mine yesterday for the same reason .....It's so easy to write how to do it but it took me over 20 minutes to clip the goddam thing back together.
    Likely you got the rubber button pad membrane offset slightly and got it trapped beteen the two halfs of the key fob when putting it back together.

    You have to really watch that as you clip it back together, that nothing moves out of allignment.

    PS....thanks for the replies about key fobs. All this modern technologhy packed into a small car. Amazing

  6. #16
    Join Date
    Mar 2012
    Location
    Burnley
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    Quote Originally Posted by colin2x2 View Post
    Likely you got the rubber button pad membrane offset slightly and got it trapped beteen the two halfs of the key fob when putting it back together.

    You have to really watch that as you clip it back together, that nothing moves out of allignment.

    PS....thanks for the replies about key fobs. All this modern technologhy packed into a small car. Amazing
    I reckon the reason was that I did it in the car at zero degrees. It wasn't the rubber for sure because I tried assembling it with nothing in there and still could not click the two halves together.

    It is probably a good caveat to only do it at room temperature.

    There is more processing power in the key fob than there is on the Voyager spacecraft.

  7. #17
    Join Date
    Nov 2013
    Location
    Central Scotland
    Posts
    428
    Yeh, at freezing temeratures the rubber will be hard.

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