TOUCHSCREEN BASED HOME AUTOMATION

Now a days everything go automatic as scientific world provides fresh and

proven technologies. These technologies not only make our life simple but effortless.

Automating a home is great idea for those who are away from their homes and those

who are unable to perform normal human activities caused by any serious disease or

accident. Here comes the advantage of home automation. There are many ways by

which one can do this. GSM technology is used here is because the range it provides is

unbeatable.

The control section consists of a touchscreen and a pc with java program.

When we login to a page using touchscreen. Then by selecting a particular device we

can make that device on, off or can detect the present status of the particular device. By

touching the screen a message will be send to the gsm modem in the home from a

modem in the pc section.

These technologies not only make our life simple but effortless.

Automating a home is great idea for those who are away from their homes and those

who are unable to perform normal human activities caused by any serious disease or

accident. Here comes the advantage of home automation. There are many ways by

which one can do this. GSM technology is used here is because the range it provides is

unbeatable.

BLOCK DIAGRAM:-

HOME SECTION

BLOCK DIAGRAM DESCRIPTION

In e-Home we are communicating between a cell phone and a GSM

modem which is placed in home. The GSM modem is a device which can do all the

operation of a cell phone but not has speaker and microphone. The SMSs received by

modem from cell phone is transferred to a micro controller and micro controller decides

what to do with that SMS with help of a pre burned algorithm.

AVR micro controller is used here because it is very affordable and easily

Available.PIC gets the SMS sent by user from GSM MODEM via RS232 interface. The

serial data will be undergone several comparisons inside the micro controller and finally

AVR will turn ON or OFF particular device , eg- Fan ,lamp, etc. Since the house hold

devices work in ac only the micro controller output is not directly connected to devices

but through relays.

GSM

GSM for Global System for Mobile. This is the standard most widely used

across the globe for mobile communication. GSM supports both voice and data

communication between terminals. The main feature of GSM compared to its competent

CDMA is the SIM card. The Subscriber Identity Module(SIM) identifies the subscriber

using that cell and make them able make and accept phone calls.

MICROCONTROLLER

The major heart of this project is AVR microcontroller, the reasons why we

selected this in our project?, it has more features like 16bit timer, 10-bit ADC, USART,

SPI, I2C, 256 bytes of EEPROM memory, and 32kbytes of flash program memory, then

at last its speed of program execution is about to 1 microsecond or 10 MIPS (10 Million

Instructions per second), etc. However, compare to other microcontroller it is fast and

very ease to program in C language because of huge support can gain from the

manufacturer for programming. The special IDE offered by the manufacture, it is named

as AVR purpose

MAX 232

The MAX232 is an integrated circuit, first created by Maxim Integrated Products, that

converts signals from an RS-232 serial port to signals suitable for use in TTLcompatible

digital logic circuits. The MAX232 is a dual driver/receiver and typically converts the

RX, TX, CTS and RTS signals.

The drivers provide RS-232 voltage level outputs (approx. ± 7.5 V) from a single + 5 V

supply via on-chip charge pumps and external capacitors. This makes it useful for imple-

menting RS-232 in devices that otherwise do not need any voltages outside the 0 V to

+ 5 V range, as power supply design does not need to be made more complicated just for

driving the RS-232 in this case.

Relay control unit

This unit facilitates the communication of the controller with the home appliance under

surveilance. The switch on and switch off conditions are decided by the controller and

the respective switching action is carried out by the relay section.

LCD display :

LCD, displays the information. We use a 16×2, dot matrix LCD display