Birthday date project

Discussion in 'Homework Help' started by saruman42, Dec 7, 2011.

  1. saruman42

    Thread Starter New Member

    Dec 7, 2011
    2
    0
    Hello all, I am currently working on a project that requires me to build a circuit on multisim and then breadboard the design. I am currently having trouble in the multisim portion of the project. I'm posting all the information regarding what I have below.

    What I'm supposed to do:
    Design a combinational logic circuit and display it results on a seven-segment display

    I have attached a photo of what I have done.

    Birthday Boolean
    (sorry, the truth table gets a bit messed up when I copy it in here)

    A B C Date a b c d e f g
    0 | 0 0 0 0 0 0 0 0 0 0 1
    1 | 0 0 1 1 0 0 1 1 1 1 1
    2 | 0 1 0 - 1 1 1 1 1 1 0
    3 | 0 1 1 2 0 1 0 0 1 0 0
    4 | 1 0 0 1 0 0 1 1 1 1 1
    5 | 1 0 1 - 1 1 1 1 1 1 0
    6 | 1 1 0 9 0 0 0 1 0 0 0
    7 | 1 1 1 4 0 0 1 1 0 1 0


    Equations:

    a = A’BC’ + AB’C
    b = A’BC’ + A’BC + AB’C
    c = A’B’C + A’BC’ + AB’C’ + AB’C + ABC
    d = A’B’C + A’BC’ + AB’C’ + AB’C + ABC’ + ABC
    e = A’B’C + A’BC’ + A’BC + AB’C’ + AB’C
    f = A’B’C + A’BC’ + AB’C’ + AB’C + ABC
    g = A’B’C’ + A’B’C + AB’C’

    All together:
    [​IMG]
    (A’BC’ + AB’C) + (A’BC’ + A’BC + AB’C) + (A’B’C + A’BC’ + AB’C’ + AB’C + ABC) + (A’B’C + A’BC’ + AB’C’ + AB’C + ABC’ + ABC) + (A’B’C + A’BC’ + A’BC + AB’C’ + AB’C) + (A’B’C + A’BC’ + AB’C’ + AB’C + ABC) + (A’B’C’ + A’B’C + AB’C’)

    Simplified:
    a = AB’C + A’BC’
    b = A’B + AB’C
    c = AC + B'C + AB' + A'BC'
    d = A + B'C + BC'
    e = B'C + A’B + AB'
    f = AC + B'C + AB' + A'BC'
    g = A'B' + B'C'


    (AB’C + A’BC’) + (A’B + AB’C) + (AC + B’C + AB’ + A’BC’) + (A + B’C + BC’) + (B'C + A’B + AB') + (AC + B'C + AB' + A'BC') + (A'B' + B'C')

    NOTE: U7 AND is currently unattached.

    Thanks in advance for any help.
    [​IMG][​IMG]
     
    Last edited: Dec 7, 2011
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    The images don't show as they are links to your local computer.
    You can upload the images to our server:

    Bertus
     
    saruman42 likes this.
  3. saruman42

    Thread Starter New Member

    Dec 7, 2011
    2
    0
    Thanks for the advice, I attached the photo.
     
  4. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
    From what I understand, you want to display the rolling message "01-21-94". Check for a bit this link (http://en.wikipedia.org/wiki/7_segment), and see which segment (a,b,c...) is which. Are you sure you have your outputs correctly? Because, for instance, {abcdefg}={000001} isn't the code for 0.
     
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