AUTOMATIC ROOM LIGHT CONTROL WITH VISITOR COUNTING FOR POWER

SAVING APPLICATIONS IN SEMINAR HALLS

 

11W91A029511W91A028311W91A02C011W91A0261

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

Liquid crystal display (LCD) makes the system user-friendly

AT89S52 micro controller is the heart of the circuit as it controls all the functions

INTRODUCTION

The system comprises of two IR Transmitter-

Receiver pairs, one of which is located in front of

the door outside the room & the other 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 stepper 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 the

required action is performed by the microcontroller.

LCD displays the number of persons present inside the room

Power supply

AT89S52 MICROCONTROLLER

8052 is an 8-bit processor, meaning that the CPU can work on only 8 bits of data at a time. Data larger than 8 bits has to be broken into 8-bit pieces to be processed by the CPU.

FEATURES OF AT89S52

ROM - 8K bytes RAM - 256 bytes Timer - 3 I/O pins - 32 Serial port - 1 Interrupt sources - 8

PIN DIAGRAM

1234567891011121314151617181920

4039383736353433323130292827262524232221

P1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7RST

(RXD)P3.0(TXD)P3.1

(T0)P3.4(T1)P3.5

XTAL2XTAL1

GND

(INT0)P3.2(INT1)P3.3

(RD)P3.7(WR)P3.6

VccP0.0(AD0)P0.1(AD1)P0.2(AD2)P0.3(AD3)P0.4(AD4)P0.5(AD5)P0.6(AD6)P0.7(AD7)EA/VPPALE/PROGPSENP2.7(A15)P2.6(A14)P2.5(A13)P2.4(A12)P2.3(A11)P2.2(A10)P2.1(A9)P2.0(A8)

AT89S52

RELAY

A Relay is an electrically controllable switch widely used in industrial controls, automobiles, etc…

inductor

DPDT RELAY• In this project we will be using

4 DPDT 5 pin relays to switch on the load applications

• DPDT stands for double pole double throw relay

• Relay is an electromagnetic device used to separate two circuits electrically and connect them magnetically

• They are often used to interface an electronic circuit, which works at a low voltage

N/C

COM

N/O

AC230V

BULB

IND

UC

TO

R

IRONARM

ON

OFF

Diagrammatic explanation:

Light Sensor(LDR)• A PHOTORESISTOR 

OR LIGHT DEPENDENT RESISTOR(LDR) IS A RESISTOR WHOSE RESISTANCE DECREASES WITH INCREASING INCIDENT LIGHT INTENSITY.

• IT CAN ALSO BE REFERRED TO AS A PHOTOCONDUCTOR.

IR Sensor

INFRARED SENSORS ALSO HAVE IMPORTANT SCIENTIFIC, MILITARY, SECURITY

Liquid crystal display (LCD):

A liquid crystal display (LCD) is a thin, flat panel used for electronically displaying information such as text, images, and moving pictures including monitors for computers, televisions, instrument panels.

1. Ground

2. Vcc +5V

3. Contrast control

4. Register select (RS)

5. Read/Write (RD/WR)

6. Enable (EN)

7. 7 – 14 pins all are data pins D0 – D7

8. Vcc +5V }

9. Ground }

Pin Description of LCD:

For backlight purpose

ADVANTAGES:

A major advantage of a lighting control system over conventional individual switching

Switching is the ability to control any light, group of lights, or all lights in a building from a single user interface device.

Any light or device can be controlled from any location. 

Reduces emission carbon footprints.A lighting scene can create dramatic changes in

atmosphere, for a residence or the stage, by a simple button press

APPLICATIONS:

Used in In landscape design

landscape lighting

 fountain pumps

 water spa heating

 swimming pool covers

motorized gates

 outdoor fireplace ignition can be remotely or automatically controlled

Hence by this project we can design a standalone automatic room light controller with auto door opening and closing to control the lighting in a room depending upon lighting that is present in the room.

CONCLUTION

THANK YOU