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Digital clock need!

Discussion in 'Electronic Basics' started by [email protected], Jan 16, 2006.

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  1. Guest

    Hello all. I am new to the world of digital electronics, I would like
    to build a digital clock HH:MM:SS with 16F84PIC on 7 segment LED, I
    need circuit diagram, software and processing explanation.

    Thanks!
     
  2. BrunoG

    BrunoG Guest

  3. Elephant

    Elephant Guest


    Here are a few links that may help you.

    http://electronicsusa.com/productsclocks.html

    http://home.howstuffworks.com/digital-clock.htm


    Good luck. I built one with huge 7 inch LED displays.
    After I plugged it in and the digits started counting,
    I was so proud of myself. That clock is now my pride and joy.
    I show it off every chance I get. Hope you'll be just as
    proud of your project.
     
  4. There are a number of ways you can accomplish this task. You need to
    tell us more about your requirements. For example, do you need battery
    operation or would AC power be ok? How much accuracy do you need? Do
    you need it to set itself?

    BTW, the 16F84 is getting kinda old, the 16F628 or 16F88 might be of
    interest to you as they are cheaper and have more features.

    Here is a good place for some PIC info:
    http://www.finitesite.com/d3jsys/
    and another really good one:
    http://www.piclist.com
     
  5. OMG, check out those prices like $49.99 for a little clock kit!
    Alot of that stuff looks very high priced to me..............
     
  6. Bill Bowden

    Bill Bowden Guest

    Hello all. I am new to the world of digital electronics, I would like
    The PIC16F84 has been replaced with the PIC16F628. There is a digital
    clock program and schematic using the PIC16F628 at:

    http://ourworld.compuserve.com/homepages/Bill_Bowden/pic_ck.htm

    -Bill
     
  7. hiroc

    hiroc Guest

    12V is battery, I need to set it and accuracy may be +(-) 1sec /10 days
     
  8. days

    That is about 1ppm (part per million) accuracy. The only way that I
    know to achieve that sort of accuracy is to use either a GPS module or a
    reference to WWV. Most crystals will only give you a accuracy between
    20-50ppm.
     
  9. Guest

    LEDs and batteries are a poor mix. Even if running 1 mA/segment, it
    will drain the battery pretty fast -- and be pretty dim. LCD is better
    for batteries. If it MUST be LED, running off the power company would
    easily provide the accuracy by simply counting the cycles of the AC.
    Mine runs great and certainly meets the accuracy spec.

    GG
     
  10. The DS4000 TCXO does 1ppm
    http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3476

    Dave :)
     
  11. Well looky there. Only $18 in thousand lots. ;-) Still cheaper and
    more convenient (not counting that BGA packaging) than a GPS module,
    pretty slick.
     
  12. The DS32KHz is cheaper and almost as good and comes in SO package:
    http://www.maxim-ic.com/quick_view2.cfm?qv_pk=2940
    This is the one I meant in the first place, sorry, I thought they had
    changed the part number or something.

    Dave :)
     
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