University Of South Asia project one way traffic light control By Nafiz, Sompa ,Riya

Project Name: One-way traffic light Control
Introduction: The name of the project is “Traffic Light Control”. The fundamental idea of this simple electronic project is to control the traffic. It can be used to avoid the traffic jams. This project is just a one-way traffic controller, although it can be further modified as well. The project will work in a way, it provides the instruction to the driver whether to drive through the intersection.

Control Lights indication:

There are three control lights or signals, which will provide the instruction to the driver.
• RED light – STOP at the intersection.
• YELLOW light – WAIT for (If red light is next) or GET READY (if green light is next)
• GREEN light – GO through the intersection.

Components Requirements:

IC
1. NE555
2. 4017B
SEMICONDUCTOR LIST
1. D1 TO D6: 1N4748
2. L1,L2,L3 : LED

RESISTOR LIST
1. 3*1 K OHM
2. 1*10 K OHM
3. 2*22 K OHM
4. 1*100 K OHM
CAPACITOR
1. 47 µF
2. 0.01 µF
3. 6.8 n F
4. 1. 16 pin IC socket
5. 2. 8 pin IC socket
6. 3. Battery 9v
7. 4. 2 pin battery connector

Circuit Diagram of Traffic Light Control mini Project:

Working Principle:

This traffic light is made with the help of counter IC, which is mainly used for Sequential Circuits. We can also call it as Sequential Traffic Lights. Sequential Circuits are used to count the numbers in the series.
Coming to the working principle of Traffic Lights, the main IC is 4017 counter IC which is used to grow the Red, yellow and green LED respectively. 555 timer acts as a pulse generator providing an input to the 4017 counter IC. Timing of glow of certain lights totally depends upon the 555-timer s pulse, which we can control via the Potentiometer so if you want to change the time of glow, you can do so by varying the potentiometer, having the responsibility for the timing LED are not connected directly with 4017 counter, as the lights won’t be stable. We have used the combination of 1N4148 diodes and the LEDs to get the appropriate output. The main drawback of this circuit is that you can never have an exact timing with this, however, you will have the best estimate

Advantage
• Stable 9V DC output
• Reliable Technology.
• Cost efficient
• improve the public transport service
Disadvantage
• Excessive delay may be caused
• Disobedience of signals