Application of decoder in traffic light control pdf

If you send it to me I will be more thankful! Greetings Sir, I am interested in making this project with my school students tomorrow, but I only have one question — Can I use actual bulbs in place of LED?

And for that I will need to input AC Current so that the bulbs light up. Can you please tell me, how can that be achieved. I will follow your design during making, kindly please instruct. You can use triacs. The outputs of the isolator will go to the gate of the triac. First find total load of lamps then size triac current rating just over load current.

The triac voltage should be rated to withstand peak to peak voltage. A VAC peak to peak is about volts, so a trick rated above that should be fine. Finally you need to work out gate current and I believe that should work. Modern signal lights use LEDs, but there are still many incandescent signal heads out there. Keep in mind that AC current can be lethal, so be sure to do this as safely as possible. Sir, I was given a mini project on traffic light controller.

So can u show me clearly how connections are to be made? If your project is not working do the following: buy 10 N diodes instead of 6. Wire them as following: 1 tooth of the counter: connect using the diode to yellow led. I am trying to simulate the program using mikroC controller but still i observe problems may you provide to me the codes please.

Hello, I wan to know if your establishment undertake traffic light control manually from an outstation. The circuit is NOT correct as drawn! Notice the potentiometer wiper arm is NOT connected to anything. If you connect this to either the upper or lower lead then you can change the time of the Also the parts call for a 1 Meg Ohm Pot. Try a K as drawn. Please submit to the following Email Address: eeetblog gmail.

We will review it and Will republish with your name and contribution. Thanks and best wishes. Can you send a picture of the circuit that you have drawn on Proteus on this email address: muhammadrashidshafique gmail. Hi I want to make small adjustments on the traffic lights, like , if any car bypass the traffic light, an alarm will Horn, how will I synchronize the alarm to the traffic light?

I am wondering if you would be able to provide me with the pcd layout of this or possibly a photo of your working proto-type? I would greatly appreciate it and thank you. Hi , I have a Traffic light probably serviceable — which I picked up from scrap. The circuit board and components seem to be intact. The LEDs and the Black plastic dome cover all are in place My question is : If i send a picture of the same would you help with your comments as to whether I can connect a 9V cell to see if it is still working.

I was given a similar project topic for my final proposal. Akinpelu gmail. Your email address will not be published. Notify me of follow-up comments by email. Four control switches are used to control develop traffic light flow and safety of the current transportation for the emergency cases such as ambulance, fire brigade and VIP system is to apply a modern traffic light control system.

Traffic case. It is also Traffic lights are signaling devices situated on the road at capable of driving light emitting diode LED , incandescent, gas- intersection points which are used to control the completing discharge, and fluorescent displays. It is a display blanking of all flows of traffic [3]. In generally, a traffic light consists of a set of illegal input combinations and latch storage of code.

For LED three lights. They are red, yellow and green. When illuminated applications, a logic 0 is required at the PHASE input for the red light, it indicates for vehicles facing the light to stop and common-cathode devices and a logic 1 is required for common- the yellow light indicates caution to prepare for stop short of the anode devices [5].

The green light is to proceed in the direction Decoder or De-multiplexer 74LS : These Schottky-clamped denoted [4]. The traffic light sequence may differ from other, and circuits are designed to be used in high-performance memory they may be special rules or set of lights for traffic turning in the decoding or data-routing applications, requiring very short particular direction. In high performance memory systems, In this system, there are three order signs for turn-left, forward these decoders can be used to minimize the effects of system and turn-right.

The timing of red, yellow and green arrowed light decoding. When used with high-speed memories, the delay times www. This means that the effective system delay introduced by the decoder is negligible.

It is a 3-to-8 line decoders and power dissipation is 32mW. Sequence of Traffic Light In a modern traffic light control system, there are four states of direction for users are shown in figure 2 a to 2 d.

The traffic light 1, 2 and 3 is active as the same performance of traffic light 4, 5 and 6 because of they are connected in parallel. And the traffic light 7, 8 and 9 is also active as the same performance of traffic light 10, 11 and 12 because of they are connected in parallel.

Software flowchart The system is divided into two modes for traffic light. One is the normal mode sequence and the other is the emergency mode sequence.

If there is no the emergency mode, the importance vehicles will be faced more delay time. Therefore, the emergency mode is very important for every traffic light.

In this traffic light junction, people waiting for the traffic light turns to green. During the traffic jam, the emergency vehicles such as ambulance, fire brigade, police car or VIP vehicles will be stuck in the traffic jam.

This case can cause the emergency Figure 2 c : Turning lane for South-West and North-East case that becomes complicated. This case is very critical problem direction [7]. When each of control switches are pushed on Figure 3 b : System flowchart for normal sequence triggered, the related emergency of each case is implemented. If each of control switches are not pushed or triggered, the normal B mode sequence is implemented as the system flowchart.

This usually occurred in the morning and in the evening at the main junctions. Due to the effect of this, people wasted their time on Counting Down the road. The delay for junctions that have high volume of traffic should be setting longer than the delay for the junction that have Set Display for Pattern7 low of traffic.

This operation is called Normal Mode [8]. End No C Figure 3 c : System flowchart for normal sequence www. The hardware results for normal mode sequence are as Yes followed.

The traffic light 1, 2 and 3 is active as the same 3, 4 0 0 1 performance of traffic light 4, 5 and 6 because of they are 7, 12 0 0 1 connected in parallel. And the traffic light 7, 8 and 9 is active as 8, 11 1 0 0 the same performance of traffic light 10, 11 and 12 because of 9, 10 1 0 0 they are connected in parallel. In this system, the traffic light 1, 6, 7 and 12 are used for free lane. Therefore, when the system is The system is implemented as the above table III.

The green implemented as figure 4, the traffic light 1, 6, 7 and 12 will be light of the traffic light 3 and 4 is ON and the red light of the displayed ever green light. The duration for green Green light of traffic light 3 is ON for 35 seconds light is 35 seconds.

In this state, the Figure 4: System flow diagram of modern traffic light users can pass through the road from East-South and West-North www. The the traffic light 2 and 5 is ON, the users on the road can pass duration for users in this state is 35 seconds.

The duration for the users can pass from light of traffic light 3 and 4 is ON for 2 seconds. East-West and West-East direction is 35 seconds. When the yellow light of the traffic light 2 and 5 is ON, the Table IV: Table of yellow light of traffic light 3 and 4 for turning users on this straight lane is needed to stop and the users who lane East-South and West-North direction situated on the turning lane from South-West and North-East direction is needed to prepare to proceed.

The yellow light of traffic light 3 and 4 is ON for 2 seconds. The result of yellow light is shown below. Figure 9: The green light of traffic light 9 and 10 for turning lane South-West and North-East direction for 35 seconds This figure 9 is a result of traffic light 9 and 10 for South-West and North-East direction.

In this state, the users from South-West and North-East direction can proceed until the yellow light of this traffic light is ON.