How Do You Design a 4-Way LED Traffic Signal Circuit?

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Discussion Overview

The discussion revolves around designing a 4-way LED traffic signal circuit, focusing on the approaches to building the circuit, including the use of discrete components and microcontrollers. Participants share their knowledge and seek circuit diagrams and guidance on the design process.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant expresses their beginner status in electronics and requests a circuit diagram for a 4-way LED traffic signal, mentioning familiarity with the 555 timer IC and other components.
  • Another participant suggests that more information is needed, noting variations in traffic signal designs, such as computer control and timing adjustments based on traffic conditions.
  • A different participant proposes two approaches for building the traffic light: using discrete logic or a microcontroller, emphasizing the educational value of both methods and suggesting the creation of a state diagram for the logic design.
  • One participant specifically requests a circuit diagram for a discrete component design.
  • A repeated request for a circuit diagram is made, along with a link to a resource that contains a circuit.

Areas of Agreement / Disagreement

Participants do not reach a consensus on a specific design approach, as multiple methods (discrete components vs. microcontroller) are discussed, and the need for additional information about the traffic signal's operational context is highlighted.

Contextual Notes

There are limitations in the discussion regarding the specifics of the circuit design, such as the assumptions about traffic conditions and the lack of detailed state diagrams or timing specifications for the proposed designs.

Who May Find This Useful

Individuals interested in electronics engineering, particularly beginners looking to understand traffic signal design, as well as those exploring both discrete logic and microcontroller applications in circuit design.

mohdfasieh
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Hello Genius guys,
I am beginner in the field of electronics engineering.Well i am planning to make LED TRAFFIC SIGNAL /i know the wroking of 555 timer ic iknow the working of Multiplexer,Demultiplexer,encoder ,decoder. well can u tell me the circuit diagram of LED TRAFFIC signal 4 way traffic signal .
 
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I'm not into electronics yet, but I suspect that you'll have to provide more information. There are a lot of variations. For instance, most large-city units are computer controlled from a central location. Also, a busy street intersecting a quiet one will usually have a longer green on its side. Then there's the matter of advance/delay turn arrows and their attendant trigger sensors, whether or not the turn lane stays green along with the main ones or turns red, etc..
 
You can either build the traffic light project with discrete logic or with a microcontroller. Both approaches are valuable educational exercises. I still remember building one from discrete logic way back in school...

But I digress. To build the discrete logic one, you will need to write up a state diagram or at least a list of states that shows step-by-step how the lights all sequence. The list should include the amount of time between steps. Once you have that list, you build logic that takes the clock, divides it down to your human time scale (like 5 seconds per yellow light), and steps through the state diagram in sequence. If you haven't had state diagrams and logic design in your classes yet, just google it and you will get some good examples. I googled state diagram logic design tutorial, and got this useful list:

http://www.google.com/search?hl=en&lr=&q=state+diagram+logic+design+tutorial

The more modern way to do this exercise is to program a small microcontroller (uC) to do it, and drive the LEDs directly from the uC. You could get a Basic Stamp, for example, and program it in Basic (hence the name) or some other language.

http://www.parallax.com/
 
well i want to make this traffic signal by discrete components.please can u send me the ckt diagram please
 
mohdfasieh said:
Hello Genius guys,
I am beginner in the field of electronics engineering.Well i am planning to make LED TRAFFIC SIGNAL /i know the wroking of 555 timer ic iknow the working of Multiplexer,Demultiplexer,encoder ,decoder. well can u tell me the circuit diagram of LED TRAFFIC signal 4 way traffic signal .

http://ourworld.compuserve.com/homepages/Bill_Bowden/page10.htm

Has a circuit.
 
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