Somebody kindly help me out! ( 2.3" 7segment anode LED counter up)

Discussion in 'General Electronics Chat' started by cholay75, Jul 24, 2010.

  1. cholay75

    Thread Starter New Member

    Jul 22, 2010
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    Hi all,
    I am new user. I need 4digit manual counter up 2.3" 7segment Led common anode. Any body kindly advice me some schematic. because I couldn't effort to buy ready made circuit out there and I really need it for very urgent. I do not have knowledge about electric. So Please kindly provide me very detail of it. Thank you very much!
     
    Last edited by a moderator: Jul 24, 2010
  2. tom66

    Senior Member

    May 9, 2009
    2,613
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    You want a 4 digit counter?

    Manual increment, or some kind of external electronic trigger?

    You can use a 4026 series IC.

    This IC controls one display. You can then chain the counters together to get 4 displays.

    You will need to be a little more specific.
     
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  3. cholay75

    Thread Starter New Member

    Jul 22, 2010
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    I just need very simple manual counter up , up to 9999. and I have 4digit of common anode which has 2.3inch, 7 segment.could you help me up with diagram including ic no and parts no.
    Thanks alots for your reply and help.
     
  4. BMorse

    Senior Member

    Sep 26, 2009
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    Do you want this timer to be based on discrete components or based on a microcontroller??

    Here is one based on a microcontroller....

    [​IMG]


    here is the hex file to program into the microcontroller.... (I had to change the extension to .txt to upload file on here, change it back to .hex once downloaded)
    View attachment 3DigitCounter_hex.txt

    B. Morse
     
    Last edited: Jul 24, 2010
    cholay75 likes this.
  5. Wendy

    Moderator

    Mar 24, 2008
    20,766
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    What is the fastest a counter like this could go you think?
     
  6. tom66

    Senior Member

    May 9, 2009
    2,613
    214
    Depends on the clock frequency. No faster than about 1 million counts per second (4 MHz / 4 cycles per instruction), if you assume 100 cycles to do one count, that's 10,000 counts per second.

    I wouldn't trust the circuit posted for keeping time. The ±1% error in the internal oscillator means every hour it loses or gains around 36 seconds. Over 99.99 seconds, the milliseconds would be completely useless, as they would be overwhelmed by the error of one second. You really need a bigger PIC, because the CLKIN/OUT is needed for a crystal, and they are being used for IO.
     
  7. BMorse

    Senior Member

    Sep 26, 2009
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    Have not tested it with any kind of "digital" input, I basically designed this more for a "human speed" trigger rather than electronic....

    This counter maybe more suitable for some type of digital pulse input faster than human speed.... and it would not be that hard to expand the display to accommodate more digits...

    Versatile Up_Down Counter.png


    B. Morse
     
  8. BMorse

    Senior Member

    Sep 26, 2009
    2,675
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    Bill was asking about the counter part, not the timer;)... but you are right, this will not be that accurate as a timer, but works well as a manual input counter....
     
  9. cholay75

    Thread Starter New Member

    Jul 22, 2010
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    0
    Thanks to every body,
    I do have some circuit, but it could not display for 2.3" common anode led.
    The voltage or ampere is not enough to lit the led. And I found this circuit but i do not have the IC No. Parts No. and circuit diagram. I have another circuit which is counter up for 4bit. but it is could not drive to 2.3" Led. And I do not want to use micro-controller and I only want is manual type.
    Thanks for your helps.
     
  10. beenthere

    Retired Moderator

    Apr 20, 2004
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  11. tom66

    Senior Member

    May 9, 2009
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    Common anode is an issue for many circuits.

    Can you not get common cathode?
     
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  12. cholay75

    Thread Starter New Member

    Jul 22, 2010
    23
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    here is the circuit that i tested. and display small 7segment led. it could not run 2.3" led. and I really need urgent. It may be upgradeable.
     
  13. cholay75

    Thread Starter New Member

    Jul 22, 2010
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    here is the circuit that I tested.
     
  14. cholay75

    Thread Starter New Member

    Jul 22, 2010
    23
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    ok, I can get it if the circuit can display 4digit of 2.3"LED. And Manual Counter up.
     
  15. cholay75

    Thread Starter New Member

    Jul 22, 2010
    23
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    If the circuit could display 2.3" LED and manual input, I can get common anode.
     
  16. BMorse

    Senior Member

    Sep 26, 2009
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    You could also invert the outputs by using the proper transistor translator circuit (or even MOSFET's)in between to drive the LED displays with higher current...

    B. Morse
     
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  17. cholay75

    Thread Starter New Member

    Jul 22, 2010
    23
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    could you advice which transistors should i implant. and where? I think mosfet is better solution. but i just don't know how to put that switch. Thanks.
     
  18. cholay75

    Thread Starter New Member

    Jul 22, 2010
    23
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    how is the mosfet work? Please can you explain to me?
     
  19. BMorse

    Senior Member

    Sep 26, 2009
    2,675
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    The circuit you said you tested, is that what you have right now?

    is this what you have now? >> [​IMG]

    B. Morse
     
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  20. BMorse

    Senior Member

    Sep 26, 2009
    2,675
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    What is the part number for the 2.3" displays that you have?
     
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