Light Dependent Resistor Implementation on Breadboard

Working Principle :

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 (e.g in morning ), by using a sensor called LDR (Light Dependent Resistor) which senses the light just like our eyes. Connect the circuit and apply power to the circuit whenever light falls on the LDR the LED will get switched off. It can also be used for nightlight detection in which whenever there is dark in the atmosphere the LED glows up but whenever light falls on this the LED gets in off state.