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7 segment display. Single number

Discussion in 'General Electronics Discussion' started by Tony P, Mar 23, 2013.

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  1. Tony P

    Tony P

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    0
    Feb 24, 2013
    Is there a way to display a single number on a 7 segment display using a 4026?

    Ideally I would like the display to appear to scroll through the numbers but stop at a set number of my choice
     
  2. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    If I understand you correctly, you mean you want it to count 0, 1, 2 and then stop a selected number.

    Is the stop number fixed, or do you need to be able to change it?

    The way to do it would be to use logic gates connected to the segment outputs to determine if the selected number has been hit and then feed this back into the clock inhibit pin.

    Bob
     
    Last edited: Mar 23, 2013
  3. Timescope

    Timescope

    43
    0
    Aug 30, 2012
    Here are some 4026 circuits. The page has an error, here is the 555 circuit

    Timescope
     
    Last edited: Mar 23, 2013
  4. Tony P

    Tony P

    4
    0
    Feb 24, 2013
    I did attempt this Bob by using a 3 input AND gate to stop at the number 7.
    However, as the number 7 uses segments A,B and C and so does the number 3 the counter stopped at 3 !
     
    Last edited: Mar 24, 2013
  5. Timescope

    Timescope

    43
    0
    Aug 30, 2012
    Use a 4 input AND gate and connect the other input to the output of a 4 input NOR gate.Connect the inputs of the NOR gate to the other segments that are zero for the desired number.

    Timescope
     
  6. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    That is what I originally started to suggest, until I realized that it would not work, so I just changed my suggestion to "logic gates". Timescope has given you the full answer.

    If you needed to be able to set the number that it stops at, you would have to use something like 7 SPDT switches that would select either the true segment output or an inverted one from each segement and send them to a 7 input AND gate.

    Bob
     
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