Design And Construction Of A Fan And Light Automation System

ABSTRACT

Electricity is one of the foremost necessary resources during this century which needs to be

conserved otherwise the next generations might be deprived of the opportunity. However

there is tendency we leave our various rooms and offices and forget to switch off the lights

and fan, so electricity is wasted. Additionally in most cases, switches of lights and fan are

situated in places where we might need to search for them in the dark and just in case of

guests, it becomes tougher. This project has two elements, the first which is the Passive

infrared sensor (PIR) and also the alternative one which is the Light Dependent Resistor

(LDR) and LM35 Temperature sensor. The first part actually senses the presence of human in

the room or office while the second part switches on the light and fan respectively based on

the state of the Passive infrared sensor (PlR) and also the condition of the room or office

where it is installed at. Once variety of persons within the space is zero, power provided

within the space arc cut off and at such, the lights and fan goes off but when somebody enters

the room, the system automatically measures the temperature and light intensity inside the

room and accordingly controls the light and fan. During daytime lights will not be operated

and during cold season fan may not be operated. This helps to avoid wasting electricity and reduces human efforts.