ABSTRACT - AUTOMATIC TRAFFIC AND STREET LIGHT CONTROLLER.doc

AUTOMATIC TRAFFIC AND STREET LIGHT CONTROLLER 

SYNOPSIS

This project of an adjustable traffic and street light controller can control the timings of four sides of traffic lights lights separately. separately. It can also control the changeover from continuous traffic light mode to blinking yellow light mode (at night), and from blinking yellow light mode to continuous traffic light mode (during day).

INTRODUCTION

In additi addition, on, this this circui circuitt also also contro controls ls the autom automati aticc switch switching ing off/on off/on of the streetlights in the mornings and evenings with fleible settings!defining the morning and evening evening time. In order to prevent false false triggering triggering of streetlight streetlight circuitry circuitry due to some shadow or light on the sensor, some time delay is taken into consideration before sending the control control signal for streetlight streetlight operation. operation. Its operation operation does not re"uire any software software and hardware knowledge. This project can also be adopted for synchronisation with the signals of adjacent traffic lights by introduction of appropriate delay in traffic light signals# timings.

WORKING PRINCIPLE

The circuit has two parts!the first for generation of control signals for streetlight and traffic light modes and the second for generation of four sides of traffic light signals. The circuit for streetlight and traffic light modes ($art I)controls the switching time of  streetlights in evenings and mornings and the time to changeover from continuous traffic light mode to blinking yellow light mode (at night), and from blinking yellow light mode to continuous traffic light light mode (in daytime). Thus it decides the mode of operation. operation.

The circuit for four sides of traffic lights ($art II) also controls the time allowed for each side of traffic. It is further classified into continuous continuous traffic light mode (for day) and blinking yellow light mode (for night).

BLOCK DIAGRAM

1. TRAF TRAFIC IC CO CONT NTRO ROL: L:--

POWER

MICROCONTROLLER 

SUPPLY UNIT

UNIT

2. STREET STREET LIGHT LIGHT CON CONTRO TROLLE LLER:R:LAMP

LDR 

CONTROL

SENSOR 

UNIT

POWER  SUPPLY UNIT

INVERTOR 

ADVANTAGES

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It can control the timings of four sides of traffic lights separately.



It can also control the changeover from continuous traffic light mode to  blinking yellow light mode (at night), and from blinking yellow light mode to continuous traffic light mode (during day).



It can also controls the automatic switching off/on of the streetlights in the mornings mornings and evenings evenings with fleible fleible settings! settings!defin defining ing the morning morning and evening time.



In order to prevent false triggering of streetlight circuitry due to some shadow or light on the sensor, some time delay is taken into consideration  before sending the control control signal for streetlight streetlight operation.



Its operation does not re"uire any software and hardware knowledge.



It can also be adopted for synchronisation with the signals of adjacent traffic lights by introduction of appropriate delay in traffic light signals# timings.

APPLICATIONS

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This project is very useful in heavy traffic cities and towns.