Displaying 2 digit number on separate 7 segment displays

Discussion in 'General Electronics Chat' started by Electronics220, Aug 14, 2013.

  1. Electronics220

    Thread Starter New Member

    Aug 14, 2013
    2
    0
    Good day

    I'm struggling to display a number from 10-14 using 2 separate 7 segment displays. I only have IC's at my disposal. The carry bit displaying the "1" or "0" on the second display works, just can't get the right results on the first one,
    "0-4". Please help!
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,441
    3,361
    Care to provide us with a circuit with part numbers?
     
  3. Electronics220

    Thread Starter New Member

    Aug 14, 2013
    2
    0
    Here is a representation of my 3 bit adder with outputs to 4 LED's, using logic gates. Secondly a circuit where I have made use of IC's, where 6+4= 10, but I get an answer of 12.

    I was able to get the "1" of the tens working, via f = (bit3*bit2)+(bit3*bit1).
    bit0 = 2^0
    bit1 = 2^1
    bit2= 2^2
    bit3= 2^3

    In an attempt to get the ones working when the answer is above 9, I came up with the following logic: d= f XOR bit3.

    I have the following ICs available:

    7408 Quad 2-input AND
    7432 Quad 2-input OR
    7486 Quad 2-input XOR
    (7447 7-Seg driver) X2
    7404 Inverter

    Hope this helps.
     
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