continuous display on seven segment

Discussion in 'The Projects Forum' started by hassi, Sep 6, 2014.

  1. hassi

    Thread Starter New Member

    Mar 1, 2013
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    hello,
    I want to display countdown on seven segment but I don't know the method to do it... Please help me...
     
  2. MrChips

    Moderator

    Oct 2, 2009
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    Well, give us a hint as to what you are attempting to do.
    What seven segment displays are you planning on using? LED? LCD?
    Common anode? Common cathode? Current, voltage rating?
    Power supply voltage and current rating?
    How many digits?
    Frequency of count down rate?
    What number are you starting and ending in the count down?
    What are counting down?
     
  3. hassi

    Thread Starter New Member

    Mar 1, 2013
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    common cathode
    does it work on 5V?
    count down - 9-0
    frequency rate - 1digit per sec
    only one digit can be displayed at one time on seven segment display
     
  4. MrChips

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  5. SgtWookie

    Expert

    Jul 17, 2007
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    Is this an assignment from a teacher/instructor/professor as homework?

    Small LED 7-segment displays generally will operate from 5v or even less, but large LED displays may have multiple LEDs in series internally, thus need higher voltages before they will illuminate.

    Common-cathode displays require that you source current to the a thru g segment input pins to output light.

    Are you planning on using 74-series TTL components, 4000-series CMOS, or perhaps a microcontroller?
     
  6. hassi

    Thread Starter New Member

    Mar 1, 2013
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  7. hassi

    Thread Starter New Member

    Mar 1, 2013
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    through microcontroller
     
  8. shteii01

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  9. hassi

    Thread Starter New Member

    Mar 1, 2013
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  10. ISB123

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  11. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    I would take a uC like Arduino board and write a program to do the count. It is a bit of overkill, but from where I sit, it is the easiest to do.
     
  12. MrChips

    Moderator

    Oct 2, 2009
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    hassi and absf like this.
  13. hassi

    Thread Starter New Member

    Mar 1, 2013
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    thanks everyone..
     
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