Automatic Street Light Control System

Automatic Street Light Control SystemOur Group Members: It is a simple and powerful concept, which uses transistor (BC 547 NPN) as a switch to switch ON and OFF the street light system automatically.It automatically switches ON lights when the sunlight goes below the visible region of our eyes. (e.g in evening after Sunset). it automatically switches OFF lights when Sunlight fall on it ( i.e on LDR ) e.g in morning, by using a sensor called LDR (Light Dependent Resistor) which senses the light just like our eyes.

About Our Project: BLOCK DIAGRAM

LDR Light Dependent ResistorTake 2 transistors. (NPN transistor- BC547 or BC147 or BC548)Resistor- 1K ohm, 330 Ohm, 470 ohmLight emitting diode (LED) - Any colorConnecting wires- Use single-core plastic-coated wire of 0.6mm diameter (the standard size)-You can use wire that is used for ComputerNetworking.Power supply-6V or 9V

Requirements:The basic principle behind the working of LED is electroluminescence

Light emitting Diode(LED):

transistor is "fully-OFF" Active Region - the transistor operates as an amplifier and IC= IB Saturation - the transistor is fully-ON operating as a switch and IC=Isaturation

Cut-off - the operating as a switch and IC=0

Transistors:

A light dependent resistor is a resistor whose resistance changes when light turn off then its turn on and when light turn on then its turn off The working principle of light dependent resistor is photoelectric effect.

Light Dependent Resistor(LDR):

Top view and side view of Light Dependent Resistor Circuit Diagram:

By using this Automatic system for street light controlling, we can reduce energy consumption because the manually operated street lights are not switched off properly even the sunlight comes and also not switched on earlier before sunset.In sunny and rainy days, ON and OFF time differ noticeably which is one of the major disadvantage of using timer circuits or manual operation for switching the street light system.

Advantages:Thank You