HOME APPLIANCES CONTROL SYSTEM USING

GSM TECHNOLOGY

GUIDE : Mr.G.RAVIKANTH

V. VARUN (09RCIA0456)M.GEYANI (09RC1A0411)P.SHIVA (09RC1AO442)T.MALLIKARJUN(09RC1A0453)

LAQSHYA INSTITUTE OF TECHNOLOGY & SCIENCES

INTRODUCTION :Now a day's every one prefers automated

control systems because of its Less Manual Operations More Accurate

Implementing an interfacing system to remotely control Home Appliances using the GSM Technology.

Literature Survey

Telephone

RF

GSM

Previous Technologies For Controlling Home Appliances :

History of the GSM Technology Mobile cellular systems introduced for commercial use

in the 1980s.In the beginnings of cellular systems, each country

developed its own system, and so    - The equipment was limited to operate only within the

boundaries of each country. - The market was also limited. To overcome these limitations, the Global System for

Mobile communications (GSM) became in 1982.

GSM Technology

GSM stands for Global System for Mobile communications Introduced in 1982 International roaming. Low mobile and base stations costs. High-quality speech

GSM Technology

GSM Radio Interface

Two frequency bands, of 25 Mhz for the GSM system:

The band 890-915 Mhz for the uplinkThe band 935-960 Mhz for the downlink

MICRO CONTROLLER

AT89S51

POWER SUPPLY

LCD DISPLAY

(16 X 2 LINES)

MAX 232RELAY 1 BULB

RELAY 1 WATER PUMP

MOTOR DRIVER GATE

GSM

DC FAN

BLOCK DIAGRAM

MICROCONTROLLER

• A Micro controller is called as “SYSTEM ON A CHIP” as it consists of

• A powerful CPU with memory, various I/O interfaces integrated on to a single silicon chip

• The main features are  4kbytes program memory  32 I/O lines  Low power, high performance 8bit microcontroller

8–bit CPU with registers A & B. 16-bit PC & DPTR 8- bit PSW & Stack Pointer Internal ROM of 0 to 4K Internal RAM of 128 bytes:Thirty –two input/output pins arranged as four 8-bit

ports:P0,P1,P2,P3Two 16-bit timer/counters: T0 and T1Full duplex serial data receiver/transmitterControl registersTwo external and three internal interrupts sources.

FEATURES OF AT89C51 MICROCONTROLLER

2

MICROCONTROLLER PIN DESCRIPTION

POWER SUPPLY

For supplying 5v DC power supply, we use the below circuit

Provides compatibility among various different equipments Introduced by Electronic Industries Association (EIA).

MAX 232

RS 232In RS232, A logic 1 is represented by -3 to -25V, While a 0 bit is +3 to +25V, Making -3 to +3 undefined. For this reason, to connect any RS232 to a

microcontroller system we must use voltage converters such as MAX232 to convert the TTL logic levels to the RS232 voltage levels, and vice versa

Embedded Controller

RXD

TXD

TXD

RXD 2

3

5

GND

MAX 232

MAX 232

16x2 Display Used for displaying

AlphabetsNumbersSpecial symbols

LCD

TEXT MESSAGE

DESCRIPTION

1.

TEXT MESSAGE

2.

TEXT MESSAGE

3.

TEXT MESSAGE

4.

ADVANTAGES :

Highly sensitive. Taking measures to reduce the electricity bill. Large coverage ON/OFF from any distance. Can handle heavy loads up to 7A.

 APPLICATIONS:

Home appliance control. Hotel lights / fans control. Shops and showrooms. Industrial applications. Electronic applications for security.

FUTURE SCOPE

This project can be further enhanced by placing sensors and providing feedback to user.

If any unauthorized person tries to enter into home, sensor will activate and GSM modem will pass this information to the owner of the house.

Any Queries

?

Thank you