Parking counter display

Discussion in 'Homework Help' started by LolaMM, Feb 13, 2018.

  1. LolaMM

    Thread Starter New Member

    Feb 13, 2018
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    I need to implement a parking counter that shows how many cars are in a parking lot.Only one car can enter/exit at a time and I have x1 sensor for exit and x0 for entry. I was thinking of using a mod 7 up/down counter and a 7 segments display but I don't know how to implement these. Any help with the MSI scheme please?
     
  2. dl324

    AAC Fanatic!

    Mar 30, 2015
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    Welcome to AAC!

    We don't do homework for you. Post the work you've done so far and tell us where you're having problems.

    Are you supposed to design the up/down counter and BCD to 7 segment decoder? Or are you able to use standard IC's?
     
  3. ericgibbs

    Moderator

    Jan 29, 2010
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    hi Lola,
    Welcome to AAC.
    Would you please post your attempt at solving the problem.
    E
     
  4. LolaMM

    Thread Starter New Member

    Feb 13, 2018
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    It doesn't tell me what to use but I thought I could use something like this pretty sure is wrong though
     
  5. ericgibbs

    Moderator

    Jan 29, 2010
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    hi Lola,
    Brightened up your image.
    E
     
    bertus likes this.
  6. WBahn

    Moderator

    Mar 31, 2012
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    Why a mod-7 counter?

    How big is the parking lot?

    EDIT: Typo. Hwy -> Why
     
    Last edited: Feb 13, 2018
  7. LolaMM

    Thread Starter New Member

    Feb 13, 2018
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    forgot to say that I can have max 7 cars in the parking lot,my bad
     
  8. dl324

    AAC Fanatic!

    Mar 30, 2015
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    The max count was in your picture.

    What you have is mostly okay. Why are you resetting the counter when the count gets to 8? Are you telling us that the parking lot magically empties itself when an 8th car enters?

    Show us how you intend to connect the other pins. Specifically up/down clock and the missing pins on the decoder.

    Aren't you missing something between the 7 segment decoder and the display?
     
  9. LolaMM

    Thread Starter New Member

    Feb 13, 2018
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    I forgot to erase the reset thing. About up and down I was thinking I should put them both through an or gate and then the output connects to load.Not sure about this though,related to the display I'm having a hard time understanding it and what is missing
     
  10. dl324

    AAC Fanatic!

    Mar 30, 2015
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    Read the datasheet to find the requirements for up/dwn clock. Then show us a schematic for your idea.
    How would you connect a discrete LED to the outputs of the decoder?
     
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