1. همسات

    Thread Starter New Member

    May 31, 2014
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    Hello can you help me plase
    Basic and I needed to design a digital clock
     
    Last edited: May 31, 2014
  2. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    You just hyjacked an existing thread with a completely different subject:
    Landline control?

    As we do not allow this, I created a new thread for you.

    Bertus

    @crutshow,
    When you see a hyjack, report the post and do not reply to the hyjacker.
     
  3. absf

    Senior Member

    Dec 29, 2010
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    What kind of digital clock do you want? One made from discrete logic gates or one using MCU? How many digits do you need? Output go to LED or LCD?

    If you check the completed projects section, I am sure you can find a few.


    Allen
     
  4. wmodavis

    Well-Known Member

    Oct 23, 2010
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  5. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    ........Why?
     
  6. panic mode

    Senior Member

    Oct 10, 2011
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    AnalogKid objects clock projects that are Digital in design?
    :)
     
  7. absf

    Senior Member

    Dec 29, 2010
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    I think what ak meant was why build a digital clock when you can buy it cheaply from chinese-goods shops like wall-mart or Daiso.

    If the purpose is to learn electronics, then more details have to be given before we can render any appropriate help.

    Allen
     
  8. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    Well, you're 0 for 2, but I appreciate the effort. What ak meant was why are you designing a digital clock? Not why design rather than build; that question was decided before the OP. What are the requirements, the environment, the parameters that determine the nature of the design?

    All of the questions are 'why'.

    ak

    And - There is a quantity of time that can not be sub-divided. Physical reality has a lower limit on a tick. Because of the quantum nature of existence, all clocks are digital.
     
    absf likes this.
  9. bertus

    Administrator

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  10. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    Does that include candle clocks, water clocks, and sundials?
     
  11. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
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    IMHO,
    Candle clocks -> digital
    Water clocks -> digital
    Sundial -> analog

    The first two are based on the molecular behavior of their respective substances and thus discrete/digital events. Unless one were to argue the particle theory of light, I see a sundial as an analog device.

    :)
     
  12. AnalogKid

    Distinguished Member

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    The particle theory of light is easy. It's the quantum theory of existence that is counter-intuitive.

    A quanta of mass - easy.
    A quanta of energy - ok, that takes a bit more imagination.
    A quanta of time - ?!?!?

    ak
     
  13. Treeman

    Member

    May 22, 2014
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    if you use ur finger as a sundial does that make it digital?

    must be bed time
     
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  14. #12

    Expert

    Nov 30, 2010
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    Four days later and no response from a one time poster. I'm beginning to doubt this will end up as a clock.
     
  15. Treeman

    Member

    May 22, 2014
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    Don't worry he's got all the time in the world.
     
  16. sirch2

    Well-Known Member

    Jan 21, 2013
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    Depends a bit on what you take analog to mean. Taken as a continuously varying signal, i.e. non-quantized then all spring and pendulum driven mechanical clocks are digital because they use an escapement to regulate the motion, hence the ticking.

    If you take analog to mean "analogous" i.e. corresponding in some way to something else, then any clock with a moving indicator that is analogous to the motion of the earth around the sun is analog.

    On the other hand you could just accept the standard definition in relation to clocks that something with hands is analog and something with changing digits is digital. :rolleyes: Words are assigned new and additional meanings as we move on - after all literally does not literally mean literally anymore http://www.theguardian.com/commentisfree/2013/aug/13/literally-broken-english-language-definition
     
  17. AnalogKid

    Distinguished Member

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    Interesting point. A pendulum is sinusoidal, or at least non-discontinuous oscillators, but the escapement is a comparator.

    I think the general use is that an analog display (time, volts, whatever) indicates quantity by physical movement (continuous or piecewise) of an indicator against a quantified background, compared to a digital display that displays digits with a descriptor. People gain information from an analog display not just by looking at the numbers being pointed to. Research shows that people tell time with an analog display by seeing distances and areas, not numbers. So an LED bar graph would qualify as analog for the same reason as a ticking clock face. Functionally, both are much closer to their original incarnations (VU meter and synchronous motor clock) than their digital counterparts.

    ak
     
  18. Merlin3189

    New Member

    Oct 20, 2013
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    Originally Posted by AnalogKid &ErnieM
    There is a quantity of time that can not be sub-divided. Physical reality has a lower limit on a tick. Because of the quantum nature of existence, all clocks are digital."
    "Does that include candle clocks, water clocks, and sundials?"

    Since this is the General Chat area, I suppose we can ramble off into fantasy.
    So where does this "quantum nature of existence" come from?
    As far as I know, there is a quantum mathematical model about energy, but a quantum theory of "existence" (whatever that may mean) and time must have passed me by. Any references to explanation of that? (My first look in WikiP brought "While time is a continuous quantity in both standard quantum mechanics and general relativity, many physicists have suggested that a discrete model of time might work."

    But looking the second point, presumably a water clock or candle ultimately changes by one molecule at a time, limiting its resolution, but not saying anything about the nature of the quantity it is measuring.
    The sundial is a more difficult question (for me), but I'd say quantum time people would have to come up with an interesting story about that. I guess you might see the ultimate resolution of a sundial when you were so far from the sun that it looked like a point source and you had a gnomon not much thicker than the wavelength of light (which one from the Sun's mixed output?) whose shadow was a diffraction pattern (the most un-quantum like part of light's nature.)
    I may be looking at that from the wrong end, since the shadow movement is produced not by the Sun, which is simply the supposedly fixed reference, but by the movement of the Earth. Does the Earth rotate in quantum jumps? Or is its angular momentum quantised so that (unless it gains or loses momentum or mass) it must rotate at an absolutely fixed rate?

    PS. As far as I am concerned, a digital clock is one which can only SHOW the time in discrete steps as opposed to an analogue display which shows time continuosly (accurately or otherwise.) Before the advent of electronic digital timepieces there were plenty of digital clocks driven by exactly the same mechanism as analogue clocks (coiled spring, gears & escapement, or synchronous electric motor were common.)
    I don't know whether there are analogue clocks based on quartz crystals, divided down by digital IC to drive a synchronous motor, but I'd be surprised if there werent.

    I even had a "digital" Voltmeter whose display was a set of rotating drums with 10 digits mounted on galvanometers! (I don't know the details of its operation, but it was obviously designed before IC days and contained lots of Ge transistors.)
     
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