SOT: Reference wall clock
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Thread: SOT: Reference wall clock

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  1. #1
    Member Hans Moleman's Avatar
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    SOT: Reference wall clock

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    Another DIY project:

    I always wanted a reference clock. With an easy to read analog clock face.
    And it had to be accurate. A LeoNTP comes close.

    I've got a GPS receiver with PPS output so why not connect those pulses to the stepper of an ordinary quartz clock?

    Garmin guaranteed the PPS pulses to be accurate to within 1 µs. And if I hard wire those to the stepper, the second hand moves within 1 µs of the start of every second. Always.

    I still need a small Arduino Nano to create positive and negative pulses, but it is not in the signal's path.

    The wall clock was the nastiest I could find in a hardware shop. To see if I would burn out its coil, before I get something fancier. Soldering wires to the coil is not that bad, just pick the soldering points on the board.

    Obviously I've got the receiver in a good spot on the roof so I can always guarantee a good reception.

    So far so good.

  2. #2
    Banned ppaulusz's Avatar
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    Re: SOT: Reference wall clock

    Quote Originally Posted by Hans Moleman View Post

    ...The wall clock was the nastiest I could find in a hardware shop...
    Hans, that's a very smart solution for a reference clock!

    That so called "nastiest" is the best in my opinion for the purpose as it has very clean easy to see even from a distance display. I'd keep it as is!

  3. #3
    Member dicioccio's Avatar
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    Re: SOT: Reference wall clock

    Hans, kudos for your project !!!

    As for the watch, it has a misaligned seconds hand... your project won't be perfect with this issue, isn't it ? You should fix it ! (kidding, of course ^_^)

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  5. #4
    Member Hans Moleman's Avatar
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    Re: SOT: Reference wall clock

    Quote Originally Posted by dicioccio View Post
    Hans, kudos for your project !!!

    As for the watch, it has a misaligned seconds hand... your project won't be perfect with this issue, isn't it ? You should fix it ! (kidding, of course ^_^)
    Well the clock was only US $15 or so. I am surprised it is going at all. Every gear was loose, and it is making a racket. I don't think it will last.

    Proof of concept first. Niceties later.
    dicioccio likes this.

  6. #5
    Member Hans Moleman's Avatar
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    Re: SOT: Reference wall clock

    Hans, that's a very smart solution for a reference clock!

    That so called "nastiest" is the best in my opinion for the purpose as it has very clean easy to see even from a distance display. I'd keep it as is!

    Yes, the closest thing I could find was a quartz wall clock, periodically synchronized by GPS.

    Well, that's not good enough. Although I have to admit, I would not be able to tell the difference without tools.

    The simplest solutions are always the best.

  7. #6
    Member Hans Moleman's Avatar
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    Re: SOT: Reference wall clock

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    I've updated the clock face and hands. A tad more easy on the eyes this way.

    And I have to admit to a real sense of relief: Finally a clock that is beyond reproach. Don't even bother trying to see it going off.
    gaijin, ronalddheld and Chaos_meme like this.

  8. #7
    Member o_justin's Avatar
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    Re: SOT: Reference wall clock

    Quote Originally Posted by Hans Moleman View Post
    Name:  DSCN0019.JPG
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    I've updated the clock face and hands. A tad more easy on the eyes this way.

    And I have to admit to a real sense of relief: Finally a clock that is beyond reproach. Don't even bother trying to see it going off.
    What a cool idea!
    Chaos_meme likes this.
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