[/size]Introduction,circuit diagram,components,principle of the project,advantages,disadvantages,applications,future scop for LDR based street light using lm324 ic and relay.

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ldr based street light using lm324 ic and relay

In this project “Street Light Controller” We have used the Micro controller 89C51 to control the streetlights along with light dependent resistors to check the intensity of the light. It is necessary to some one to switch on the streetlights in the evening and has to switch off in the morning. If forgotten to do this there will be problem in the evening and there will be loss off power in the day time.

To avoid this, in this project we have implemented that the micro controller will switch ON the street light in the evening when the sun light goes on decreasing. Then micro controller will switch OFF the streetlight in the morning when the sun starts rising.

In this project micro controller will control the streetlight by sensing the sun light in the street. The micro controller will sense the sunlight with the help of Light Sensing Section and switches ON and switches OFF the lights by connecting and disconnecting the power line to the loads through the relay.

Needs no manual operation for switching ON and OFF. When there is a need of light it automatically switches ON. When darkness rises to a certain level then sensor circuit gets activated and switches ON and when there is other source of light i.e. daytime, the street light gets OFF. The sensitiveness of the street light can also be adjusted. In our project we have used four L.E.D as a symbol of street lamp, but for high power switching one can connect Relay (electromagnetic switch) at the output of pin 3 of I.C 555 that will make easy to turn ON/OFF any electrical appliances that are connected through relay.