Traffic signal's

TRAFFIC LIGHT CONTROLLER
By:
Tufail Khan
Arshman Saleem
Sarang
Ubaidullah

HISTORY OF TRAFFIC LIGHT
The world's very first traffic lights were invented by J P
Knight installed near London's House of Commons,
which was on the intersection of George and Bridge
Street, in 1868.
In 1914 The American Traffic Signal Company installed
red and green traffic lights on every corner of the
intersection of 105th Street and Euclid Avenue in
Cleveland, Ohio.
First traffic lights were all controlled by either timing,
or manually switched

RED
Come to complete stop at stop line or before crosswalk
or intersection.
After stopping, you may turn right on red
at most intersections if the way is clear.
Some school districts have local policies that prohibit
right turns on red by bus operators.
Some intersections display “NO TURN ON RED,” which
you must obey.

YELLOW
Stop if you can do so safely.
The light will soon be red.
GREEN
Go, but only if intersection is clear.
If turning left, wait for gap in oncoming traffic to
complete turn.

Few things about AT89C51
 It has four Ports:
Port 0
Port 1
Port 2
Port 3
These Four ports works as Input port as
well as output port.

ABSTRACT
The function of traffic lights is to provide
sophisticated control and coordination to
ensure that traffic moves as smoothly and
safely as possible.

FEATURES OF TRAFFIC LIGHT CONTROLLER
controller assumes equal traffic density on
all the roads.
The free left turn condition is provided
throughout the entire signal period.
The control can also be exercised manual
when desired.

INTRODUCTION
• This project uses a LED light as an indicator.
• A microcontroller for auto change signal after a
specific time interval.
• The LEDs are automatically on and off by
making the corresponding port pin of the micro
controller high.

COMPONENTS
AT89C51 Microcontroller
Capacitor (30pF x2,10µF)
Resistor (8.2KΩ)
Crystal oscillator (11.0592MHz)
LED light (Red, Green, Blue)
PCB
Power supply

WORKING
The pins of the various input output ports of the
microcontroller are connected directly to the
given LEDs.
The 8051 is programmed in a manner that the
respective LEDs glow by setting the required bit
using assembly language and a certain amount
of delay is provided depending on the user.

MOTIVATION
The project finds high practical and
widespread use.
It is a very primitive application of the
microcontroller.
Easy and convenient to be built for a
beginner as the coding comprises of
basic instructions.

SCOPE
This project can be enhanced in such a way
as to control automatically the signals
depending on the traffic density on the roads
using sensors like IR detector/receiver
module extended with automatic turn off
when no vehicles are running on any side of
the road which helps in power consumption
saving.

Traffic signal's

Recommended

Recommended

More Related Content

What's hot

What's hot (20)

Viewers also liked

Viewers also liked (20)

Similar to Traffic signal's

Similar to Traffic signal's (20)

More from A-Tech and Software Development

More from A-Tech and Software Development (13)

Recently uploaded

Recently uploaded (20)

Traffic signal's