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TRaffic lights project

Discussion in 'Homework Help' started by wowzone2009, Dec 6, 2011.

  1. ljcox

    ljcox Well-Known Member

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    I have some questions & comments about the circuit attached to your post #14.

    Why is pin 2 connected to Vdd? This is not correct or necessary.

    You show 10 rows in your LED tables, such as the one in the post #20 but in the circuit, you have only used 8 of the outputs (not counting O5 ~ 9).

    The O & pin numbersa are not aligned with the diode wires.

    What colours are LEDs 1, 3, 5, 7, 8, 9?

    It is impossible to help you until you correct these issues.

    BTW, regarding your post #20 the circuit I posted (see post # 11) was not from a web site. I did the design myself.
     
    Last edited: Dec 10, 2011
  2. wowzone2009

    wowzone2009 New Member

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    Thank you for your helping but , the circuit is correct if you see , just the names are coming up in that picture ( i dont know why ) . i simulation the new one for you with multisim , you have this simulation software ?
     
  3. ljcox

    ljcox Well-Known Member

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    You're welcome
    I don't have multisim. I can see if a circuit will work or not by looking at it. I don't need to simulate.

    I can see that the numbers have been displaced, so that questions is resolved.

    But you did not answer my other question about the LED colours.
     
    Last edited: Dec 10, 2011
  4. dave

    Dave New Member

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  5. wowzone2009

    wowzone2009 New Member

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    ok i will send the new one here which is so clear
     
  6. wowzone2009

    wowzone2009 New Member

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    please can you tell me that i need what kind of 555 timer , and counter 4017 , and transistors ,and diode
     
  7. ljcox

    ljcox Well-Known Member

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    I'm waiting for it.
     
  8. ljcox

    ljcox Well-Known Member

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    Go to a parts supplier's web site & search for them.

    For example, go to www.jaycar.com.au

    And search for catalogue number ZC-4017.

    For the 555 search for ZL-3555 or the CMOS version ZL-3455.

    For transistors, any general purpose small signal NPN transistior will suffice.
    For example BC546 (ZT-2150), BC547 (ZT-2152), BC548 (ZT-2154), BC549 (ZT-2156), BC550 (ZT-2160), 2N2222A (ZT-2298), etc.

    Diodes: the 1N4148 (ZR-1100) is a common one that is readily available.

    Note that different suppliers will have them under different catalogue numbers.

    JayCar also provide data sheets for their products.

    They also have outlets in the USA & the UK.
     
    Last edited: Dec 10, 2011
  9. wowzone2009

    wowzone2009 New Member

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    Thank You from all Members who have helped me in this assignment .
    but still i need to get diagram , and true table . and explain all why i have used these component . which i will ask you one by one :).
     

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  10. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    Than you should be able to figure this out right?
     
  11. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    You still have not labled the LEDs.
     
  12. wowzone2009

    wowzone2009 New Member

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    i know all of them :D , A B C
    GY GY GY
    R R R
     
  13. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    OK than lable the leds in your Circuit.
     
    Last edited: Dec 11, 2011
  14. ljcox

    ljcox Well-Known Member

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    I have studied your latest circuit.

    If you are intending to make one, you will need to add resistors in series with the LEDs as in your previous circuit & a 100 nF capacitor connected from Vdd to Gnd.

    Note that: what works in a simulation may not be viable in practice.

    In this case, you would possibly damage either your transistors or LEDs or both due to too much current.

    Without the resistors, the current will depend upon the gain of the transistors & the output resistance of the 4017.

    The 100 nF cap is essential to prevent odd behaviour of the 4017.
     

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  15. ljcox

    ljcox Well-Known Member

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    I noticed another problem with your circuit.

    You copied a mistake I made in the circuit I posted in Post # 11.

    I should have drawn OR gates, but accidently drew NOR gates.

    See the attachment - it shows both options.

    Also note the IC numbering. The convention is to use letters for the sections inside the IC. So in the example attached, the OR or NOR gate package is labled U3 thus its gates are labled U3a, U3b, etc,

    Also note that the inputs of the unused gate (U3d) need to be connected to either Vdd or Gnd. Don't leave them open.
     

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  16. mohnish1992

    mohnish1992 New Member

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    I also have this same assignment and I need some help.

    Can you please list down the exact materials that needed to be used for this assignment so I can buy this materials as soon as possible.

    Thanks
     
  17. ljcox

    ljcox Well-Known Member

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    You are asking us to do your work for you.

    It is not difficult.

    Just look at the circuits & write a list of what you see.

    Start with his post # 28 then view my posts 33 & 34. Note that I gave him 2 options in # 34.

    He will have chose between them depending on whether he can buy a 4001 or a 4071.

    This choice will depend upon price & availability. You should do the same.

    If there are any parts that you're not sure of, ask for our advice on them.
     
    Last edited: Dec 12, 2011
  18. colin55

    colin55 Well-Known Member

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    I also have this same assignment and I need some help.
    Can you build this circuit for me at no cost and send it to me by tomorrow at no cost to me.
     
  19. wowzone2009

    wowzone2009 New Member

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    Stop copying from my answer please! later i will submit the whole one ( after i submit my assignment ) . make your own topic and ask the ppl to help u . but no one will do the whole for u . after 1 month searching now i have found that what 's going one ! now dont ask me give u simply !
     
  20. emi kacak

    emi kacak New Member

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    if i not mistaken it cannot use ic 4017..u suppose to use ic 74 series..
     
  21. wowzone2009

    wowzone2009 New Member

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    you are in multimedia university ?
     

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