Digital Electronic 3 bit seven segment design

Discussion in 'The Projects Forum' started by silent_assasin, May 19, 2012.

  1. silent_assasin

    Thread Starter New Member

    May 19, 2012
    4
    0
    Hi guys long shot here im looking for some help to design a 3 bit up/down synchronus Jk flip couter. i have the synchronus ok but as i am new to electronics i need help with

    i want to connect this to a seven segment display with these conditions:

    at 0 display E switch closed

    at 1 display 0 switch open

    at 2 display 1 switch open

    at 3 display 2 switch open

    at 4 display 3 switch open

    at 5 display 4 switch open

    at 6 display F switch closed



    Is this possible if so any help is appreciated
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,421
    3,357
    Are you using TTL or CMOS gates?
    Have you looked at a 4017 decade counter?
     
  3. silent_assasin

    Thread Starter New Member

    May 19, 2012
    4
    0
    Im so sorry im not sure ill be using simulation software using Multisim sorry i wasnt specific i really am new to all this Not to sure what to do.
     
  4. absf

    Senior Member

    Dec 29, 2010
    1,492
    371
    I attached the decoder section of your circuit for display E, 0,1,2,3,4,F on your LED when the button is pushed. The 4017 is used to test the display. Dont understand what is "switch closed and open" so I didnt include them.

    Allen
     
  5. Darknight7

    New Member

    May 21, 2012
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    I wanna add sth to the question; how can add flip flop to obtain output as a cont. variable I wanna obtain character(A-H)
     
  6. absf

    Senior Member

    Dec 29, 2010
    1,492
    371
    Open Excel and put "A-H" on the left column, segments a-g on the top row. put in the pattern for all the segments to be ON "0" and OFF "1" on the spreadsheet. eg. A="0001000",
    b="1100000" etc
    Use 7 NOR gates and count the amout of inputs with "1" for segment "a" vertically.....hope you get the idea.

    Allen
     
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  7. Darknight7

    New Member

    May 21, 2012
    20
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    How should I design the circuit I mean can you share an example of the diagram? I am new at that subject? (with flip flop and seven segment I thought also NOR-like you- and INVERTER gates.)
     
  8. silent_assasin

    Thread Starter New Member

    May 19, 2012
    4
    0
    Thanks for the help asbf will try it out today. i was told i could only use a 3 bit counter aka using 3 JK flip flops with Q0, Q1,Q2 as the out puts i can build the synchronous up/down counter im just curious of how to skip the numerical values and use the hex display instead. As i am not too familiar with this :s am i right to assume in the diagram provided that is the Decoder that leads to the nor gates.

    Could i apply this with a 3 pin input decoder with the 8 outputs?

    aplogies if i am not technically clear still learning hope this is understandable. Your help is greatly appreciated :)
     
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