How to display 0 to 15 in to 2 x 7segment?

Discussion in 'Homework Help' started by markosma16, Oct 4, 2016.

  1. markosma16

    Thread Starter New Member

    Jul 12, 2015
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    I've been trying to work on this but I can't make it. I'm using 74LS93 to display 0 to 15 into 2x 7segment. So far I worked on displaying 10 but after that it'll reset. I ANDed Qb and Qc (4 & 2) and put it in the RESET but instead the ones digit will count up to 15 (not decimal) and reset again.
     
  2. markosma16

    Thread Starter New Member

    Jul 12, 2015
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    So the display of the first digit will be like this : 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 then back to 0 again
    the 2nd digit will only become 1 when the 1st digit becomes 0. So far 0 to 10 then back to 00 is all I worked.
    Sorry for bad english
     
  3. hp1729

    Well-Known Member

    Nov 23, 2015
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    Design 888 15 in two displays.PNG
    If you are really desperate to do this you can use a PROM. The 7493 selects the address of the PROM. The contents of the PROM gives the desired digits. 74S188 or 74S288, or other 32 x 8 PROM.
     
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  4. markosma16

    Thread Starter New Member

    Jul 12, 2015
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    Is there any other trick that can I use like putting some logic gates or adding one 7493?
     
  5. hp1729

    Well-Known Member

    Nov 23, 2015
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    Another counter would do it. Reset the one's counter at a count of ten and carry that to the ten's counter. Then reset both counters at a count of 1, 5.
    But then you have two counters. Why not just use two decade counters.
     
  6. MrChips

    Moderator

    Oct 2, 2009
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    That is assuming that you are counting a clock signal.
    What if there is no clock and the 4-bit binary value is static?
     
  7. hp1729

    Well-Known Member

    Nov 23, 2015
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    Design 890 15 counter.PNG
    The ones counter counts up to 9. On the tenth pulse it resets itself to zero and sets the tens counter. On the following sixth count both counters reset.
     
  8. hp1729

    Well-Known Member

    Nov 23, 2015
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    Design 890 B 15 count.PNG
    Second version. You really don't need the second counter, only one latch. same basic operation.
     
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