AUTOMATIC INTELLIGENT ROOM LIGHT CONTROLLER USING 89S52 MICROCONTROLLER
WITH VISITOR COUNTER
ABSTRACT:
In this competitive world and
busy schedule human cannot spare time to perform his daily activities manually.
The most common thing that he forgets to do is switching OFF the lights
wherever they are not required. This project is a standalone automatic room
light controller with auto door opening and closing. The main aim of the
project is to control the lighting in a room depending upon lighting that is
present in the room. Use of embedded technology makes this closed loop feedback
control system efficient and reliable. Micro controller (AT89S52) allows
dynamic and faster control. Liquid crystal display (LCD) makes the system
user-friendly. AT89S52 micro controller is the heart of the circuit as it
controls all the functions.
The system comprises of two IR
Transmitter-Receiver pairs, one of which is located in front of the door
outside the room. The other pair is located inside the room. LDR is placed
outside the room and is used to identify whether it is day or night time.
Initially the light is switched off in the room. Whenever a person tries to
enter into the room, the receiver of first IR pair identifies the person. Then
the microcontroller opens the door by rotating the DC motor. After the person
had entered into the room completely, the door will be closed automatically.
The light is switched off even if anyone is
present inside the room during the day time. Similarly, the light is switched
off if no one is there inside the room or if it is night times. Thus, depending
on the intensity of light and the surrounding temperature, the required action
is performed by the microcontroller. LCD displays the number of persons present
inside the room.
This project uses regulated 5V,
500mA power supply. 7805 three terminal voltage regulator is used for voltage
regulation. Bridge type full wave rectifier is used to rectify the ac out put
of secondary of 230/12V step down transformer.
BLOCK DIAGRAM:
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