4 way traffic light system help

Discussion in 'Homework Help' started by Grestei, Nov 27, 2015.

  1. Grestei

    Thread Starter New Member

    Nov 27, 2015
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    I am trying to do a 4-way traffic light system using a 555-timer and a 4017 for a school assignment. The traffic lights are to work in the following way:

    1. Traffic lights 1 and 2- green light, traffic lights 3 and 4 both red light.

    2. Traffic lights 3 - green light on its own. Traffic lights 1, 2, and 4 will be on their red light.

    3. Traffic light 4 and 1 - green light while traffic lights 2 & 3 are red.

    I have already managed to make step 1 and 2 work, but can't figure out how to make the third. Attached is the layout of my circuit so far. I would appreciate any help. Thanks in advance. tl.jpg
     
  2. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
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    Last edited: Nov 27, 2015
  3. absf

    Senior Member

    Dec 29, 2010
    1,493
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    What about like this?

    TRAFFIC.PNG
     
    atferrari likes this.
  4. Grestei

    Thread Starter New Member

    Nov 27, 2015
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    Thanks all :)
     
  5. aisah

    New Member

    Feb 28, 2016
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    can i simulate the traffic lights in the multisim,,because our project must be done and perform using multisim app
     
  6. aisah

    New Member

    Feb 28, 2016
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    please help me! the dead line of our project is coming to an end
     
  7. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    Yes.
     
  8. WBahn

    Moderator

    Mar 31, 2012
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    The project specifies four lights and two colors for each light, so that's eight things. Why do you have twelve LEDs?

    You don't have any current limiting resistors for any of your LEDs.

    You have LEDs that are not completely connected.

    You have LEDs in parallel, which is not a good idea.

    Your problem only describes three states, but your circuit is using many more than that.

    Using the Q output of the 555 as part of the timing circuit is not a good idea, but you can get it to function.

    Don't leave the control voltage pin on the 555 floating.

    Your reset approach on the counter seems kluged.

    You have counter outputs that are shorted.

    You have one output that is not going through a diode while the others are. Why?
     
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