This document summarizes a student project on a traffic light controller circuit. It includes an introduction describing a basic two-way traffic light model, a list of components used including integrated circuits and LEDs, an explanation of the circuit diagram and how it works by toggling lights in sequence when a switch is pressed, and conclusions about potential improvements and limitations for controlling more complex traffic flows.

1. Traffic Light Controller
Submitted to Submitted By
Prof. Rohit Rastogi Nimmi Verma
Preeti
C.S.E(Third Sem)

2. Acknowledgement
This presentation is prepared on TRAFFIC LIGHT
CONTROL SYSTEM and acknowledges the
dedicated work of Nimmi Verma and Preeti of
B.tech 2nd year (CSE).
Also, a lot of thanks to our Proffs. Mr. Rohit Rastogi
and Mr. Shyam Singh under whose guidance this
presentation have come to success.
We look forward for complementing various critics
who have given comments for the improvisation
of this project.

3. Content
• Introduction
• Apparatus
• Pin Description
• Circuit Diagram & Working
• Truth Table
• Future Scopes
• Limitations
• Conclusion

4. Introduction
This two way traffic light project described below is
a small model of traffic light which we see in
Our day to day life on streets.
Basic Idea:- Basic Idea behind this project is to
avoid different collision of vehicles and avoid
the accident.

5. Control Signals
• Red :- For Stop
• Yellow :-Ready To Go
• Green :- Go

6. Apparatus
• Bread Board
• Connecting Wire
• Battery
• IC’s
:- CD4017(16 pin CMOS decade counter/ Divider)
:- 4072 ( a dual 4 input OR gate.)
:- 7432 (a quad 2 input OR gate.)
• LED

7. Pin Description
CD4017:- CD4017 is a16 pin CMOS decade counter/ Divider.
It take clock signal from the clock input and turn on the 10
output in sequence, each time when it receives clock input
pulses.
4072:- 4072 is a dual 4 input OR gate. Output of OR gate goes
high when any of the input goes high and if all input is low
then output is also low.
7432 :- 7432 is a quad 2 input OR gate. In this also output goes
high when any of the input is high and goes low when all
inputs are low.

9. Working
• First of all make the connections as shown in
circuit diagram.
• When switch is pressed first time output pin 3 of
IC1 goes high . Because of this pin 2 of IC2
become high and Green LED6 will glow. Similarly
this high is also provided to pin 1 of IC3 therefore
its output also goes high indicated by glowing of
RED LED1.
• Similar phenomenon happens when you press
the switch second, third and fourth time. Because
it is making the pin 1 and pin 3 of IC2 and IC3 to
go high

10. • Now when you press the switch for fifth time pin 10 of
IC1 goes high and this will make all input (2, 3, 4 & 5) of
IC2 low because of that Green LED 6 stop glowing. And
Yellow LED5 connected to Diode D1 start glowing. And
pin 3 of IC3 is high and Red LED1 continuous to glow.
• Now when you press the switch for sixth time pin 1 of
IC1 goes high. Which will make the pin 13 of IC2 goes
high this will glow the Green LED 3. It will also makes
the pin 4 of IC3 high and because of this, pin 6 of IC3
also high and Red LED 4 also glow.
• Now when you press the switch for tenth time pin 11
of IC1 goes high and this will make all input (9, 10, 11 &
12) of IC2 low because of that Green LED 6 stop
glowing. And Yellow LED2 connected to Diode D2 start
glowing. And pin 6 of IC3 is high and Red LED4
continuous to glow.

12. D1 D2 IC2a IC2b IC3a IC3b R 1 Y 1 G 1 R 2 Y 2 G 3
0 0 1 0 1 0 1 0 0 0 0 1
0 0 1 0 1 0 1 0 0 0 0 1
0 0 1 0 1 0 1 0 0 0 0 1
0 0 1 0 1 0 1 0 0 0 0 1
1 0 0 0 1 0 1 0 0 0 1 0
0 0 0 1 0 1 0 0 1 1 0 0
0 0 0 1 0 1 0 0 1 1 0 0
0 0 0 1 0 1 0 0 1 1 0 0
0 0 0 1 0 1 0 0 1 1 0 0
0 1 0 0 0 1 0 1 0 1 0 0

13. Future Scope
• Using timer and micro-controller, this circuit
can become more efficient and automatic.
• Using methodology of this circuit we can
design four way traffic light controller also.

14. Limitations
• This circuit control only two way traffic due to
this reason it is use only in towns and slow
traffic areas.
• This circuit does not contain any type of timer
or micro-controller, so it operates manually.
• This circuit cannot be used in metro city or
where there is more traffic.

15. Conclusion
Through this knowledgeable presentation we
want to conclude that the traffic light
controller system is the basic need for today’s
busy people.
This system is basically designed through logic
gates and we can further design a four way
controller system.
In a nutshell, this system defines a more
precautive way of preventing day to day
accidents.

17. Team Member
Nimmi Verma
( niknimnik@gmail.com).
Preeti
(madnawatpreeti6@gmail.com).