home automation using gsm module

HOME AUTOMATION

Introduction

Home automation has become one of the fastest developing application-based technologies in the world

The idea of comfortable living in home has since changed for the past decade as digital, wireless technologies are integrated into it

History

In 1966 Jim Sutherland, an engineer working for Westinghouse Electric, developed a home automation system called "ECHO IV“

This was a private project and never commercialized

With the invention of the microcontroller, the cost of electronic control fell rapidly

Remote and intelligent control technologies were adopted by the building services industry and appliance manufacturers worldwide, as they offer the end user easily accessible and/or greater control of their products.

Today, phone is an important part of our life.So we thought of automating our home

using phones

Reciver

Transmitter

Power supply

The microcontroller and other devices get power supply from AC to Dc adapter through 7805, 5 volts regulator. The adapter output voltage will be 12V DC non-regulated. The 7805/7812 voltage regulators are used to convert 12 V to 5V/12V DC.

Microcontroller

The AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller

Features: 8K Bytes of In-System

Programmable (ISP) Flash Memory Endurance: 1000 Write/Erase Cycles 4.0V to 5.5V Operating Range 256 x 8-bit Internal RAM 32 Programmable I/O Lines Full Duplex UART Serial Channel

GSM modem(900/1800MHz)

Semen’s GSM/GPRS Smart Modem is a multi-functional, ready to use, rugged unit that can be embedded or plugged into any application

The modem comprises several interfaces: LED Function including operating Status External antenna ( via SMA) Serial and control link Power Supply ( Via 2 pin Phoenix tm

contact ) SIM card holder

The modem consist of Power supply Power supply switch Sim card holder GSM module JP5 & JP6 connectors GSM module I/O connectors RS232

Interfacing

GSM modem will work properly with just about every popular microcontroller

It has a built in RS232, this is used by it 2 communicate with micro controller

RS232

RS232 stands for recommended standard 232

It is an interfacing standard It defines electrical characteristics and

timimg of signals The current version in use is TIA-232-

F,issued in 1997

Other components

LCD (Liquid Crystal Display) External EEPROM memory PIR Sensors(Passive infra red sensor)-

used to detect movement Smoke sensor

Working

The adapter output voltage will be 12V DC non-regulated. The 7805/7812 voltage regulators are used to convert 12 V to 5V/12V DC

In the security system the micro controllers is programmed in such a way that if somebody had entered in home with out permission the sensors will detect and give an interrupt to the microcontroller, if the controller is interrupted it will give commands and user number to the modem to sent the alert SMS to the owner mobile

The main application of LCD in this project is to display the status of MODEM, status of sensor etc. for example if the microcontroller is initializing the MODEM, if any case MODEM failed to initialize the user don’t know what is happening in the system, so we use the LCD to display the status.

RS 232 CONVERTER is a chip to convert the TTL voltage levels into RS 232 level and vice versa

Sensor is used to detect the movement, if any body open door forcibly the sensor will give output to microcontroller. Smoke sensor is used to detect smoke.

What next in Home Automation

Addressing medical issue Linking devices i.e. computer, phones,

laptops, etc

Advantages

It is used to make life easier It is used to improve security of our home

and office

Disadvantages

If the microcontroller fails ,then it leads to catastrophe

Application

Home automation Office automation.

Conclusion

As per the block diagram explained earlier, with respect to command via sms that has been sent to the controller via GSM module from phones, gets interpreted by controller and then activates required switch to control the electrical item.

The proposed model can control all electrical items from anywhere in the world, as long as GSM has coverage of the service provider.

References

http://www.slideshare.net/chinmayjena/home-appliance-control-using-gsm

arfinfotech.com/.../GSM%20CONTROLLED%20HOME%20AUTOMAT

http://www.automatedhome.co.uk/mobile-phones/control-your-home-with-gsm.html

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