home automation using gsm module
DESCRIPTION
Automating home using sms technologyTRANSCRIPT
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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