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DESIGN AND CONSTRUCTION OF A TWO LANE TRAFFIC LIGHT

 

ABSTRACT

          The project work is on the design and construction of automatic two lane traffic light control.

This system is based on digital electronics.  It employs an astable multivibrator which is the clock generator that sends  the clock into a time sequencing generator using a decade counter with ten (10) decodes output that has it’s binary corded decimal (BCD) output into a diode or gate that sends logical data’s into a transistor switching circuit that switches the lamps that raises traffic signals on the two lane junction.

 

CHAPTER ONE

INTRODUCTION

1.1     GENERAL DESCRIPTION OF THE PROJECT

 

          The trend in electronics is tending into digital electronics which make it possible for the birth of computers, digital communication systems like GSM, and industrial automation.

          This is the main reason why we have chosen a project topic on the design and construction of an automatic two (2)-lane traffic light control.

This system has always been right from the advent of digital electronics in Nigeria.

Our own project design is the miniature type that employs six (6) light emitting diodes (LED) as the visual display unit (VDU).

The entire system contains four (4) different plus the block that contains the light omitting diodes which makes it five (5) blocks altogether and also a power supply unit (PSU) that supplies the battery voltage.

          At the input is an astable multivibrator (AMV) built using 555 timer that provides the intelligence clock signal that determines the timing based on what the time sequence generator interprets from the clock (10 ten decade counter).  Then the binary corded decimal (BCD) output is now ored using discret junction diodes as OR gate such that an output is adapted using the functional behaviour of OR-gate into an inter-fase card that contains arrays of transistor switching circuit that switches the six (6) LEDS based on the timing sequencing such that three (3) LEDs for one lane, the other three (3) goes for the other lane, which gives vehicles passing from one lane to another lane traffic signal so as to avoid accidents.