up / down counter

Discussion in 'The Projects Forum' started by crossfire, Oct 21, 2009.

  1. crossfire

    Thread Starter New Member

    Oct 21, 2009
    2
    0
    i have a project to design a parking lot system ...
    i need to design a counter that start from 30 and go down to 0 ... using 7-segment display ....
    it will go down by pressing a button eg: if it is 30 i will press button, and it will go down to 29 (* a car going in * ) ,and i need another button to count 1 up (* a car going out *) and when the counter become 0.
    another 4 7-segment will display F U L L ...
    can anyone help me with that ???
    thx
     
    Last edited: Oct 21, 2009
  2. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    I'd start from a CD4510 chip.
     
  3. crossfire

    Thread Starter New Member

    Oct 21, 2009
    2
    0
    thx bill marsden i will give it a try .. i really appriciate your help
     
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