Large Seven Segment Display.

Discussion in 'Embedded Systems and Microcontrollers' started by arshadmahmood, Feb 19, 2011.

  1. arshadmahmood

    Thread Starter New Member

    Feb 19, 2011
    6
    0
    Dear All,

    I am using Large Size(12 inch digit) height 7 segment display meter of following specification. This meter using for our machine speed which is 110meter long? Currently no problem with it but I want to change something please guide me.


    INPUT REF, 0 to 10VDC
    DISPLAY SCALE 0-999

    We can be set on different set point.

    It is 3 digit displays. All display show zero when machine in stop condition or zero volts on input reference point but I want to do that show only single digit zero & other 2nd & 3rd digit should not be glow.
    The display design on PIC16F878 (micro-controller). Kindly guide me how to off to 2nd & 3rd ZERO when no volt on input reference point?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    That is called leading zero suppression. The program needs to evaluate the leading digit, and not make an output when the highest is 0. Then evaluate the second, and not output when 0.

    This is very general, as we have no idea at all about your hardware, the interface with the display, or the code.
     
  3. arshadmahmood

    Thread Starter New Member

    Feb 19, 2011
    6
    0
    Dear Sir,

    Thank you very much for your reply.

    I will share my display schematic circuit with you after scan.
     
  4. arshadmahmood

    Thread Starter New Member

    Feb 19, 2011
    6
    0
    Dear Sir,

    Please check attachment of schematic diagram.I need your guidline
     
  5. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,346
    Hello,

    The schematic is to blurry to make anything of it.
    Can you post a sharper and with more contrast picture?
    A schematic in .PNG is prefered.

    Bertus
     
  6. arshadmahmood

    Thread Starter New Member

    Feb 19, 2011
    6
    0
    Dear Sir,

    Please check in png
     
  7. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,789
    945
    That picture is no better, but I believe I can make out an OE pin on the displays. That is an "output enable" pin, and would be the one you need to apply ground to when you wish to turn off the display.
     
  8. arshadmahmood

    Thread Starter New Member

    Feb 19, 2011
    6
    0
    Dear Sir,

    If you can done my job so please explain in details & tell me which changes will be occur??
     
  9. arshadmahmood

    Thread Starter New Member

    Feb 19, 2011
    6
    0
    REMINDER

    Sir, Please give your guideline
     
Loading...