Presented By
R. RADHIKA
M. SUCHARITHA
G. MUKESH
K. VEERENDRA

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Abstract
The aim of home automation is to control home devices from a central control point. In this project, we present the design and implementation of a low cost but yet flexible and secure Wi-Fi based home automation system.
The communication between the devices is wireless. The protocol between the units in the design is enhanced to be suitable for most of the appliances. The system is designed to be low cost and flexible with the increasing variety of devices to be controlled.
Automation is today’s fact, where more things are being completed every day automatically, usually the basic tasks of turning on or off certain devices and beyond, either remotely or in close proximity. The control of the devices when completely taken over by the machines, the process of monitoring and reporting becomes more important
Depending on the location of its usage, automation differs in its name as industrial automation, home automation etc. With the development of low cost electronic components home automation migrated from being an industrial application to home automation. The home automation, our point of concern deals with the control of home appliances from a central location.
Development of data acquisition is the process of gathering signals from the remote sources and digitizing those signals for storage, transmission and analysis. Data logging, carried out by a data acquisition system(DAS), is used to measure real world parameters in real time. In this system data logging systems consists of measuring outputs (sensors).
In this project microcontroller collects the data continuously, and sends to wi-fi at other end data is received by wi-fi receiver and sends to webpage at pc it continently updates the different sensors data and controls the devices connected to the microcontroller.
The devices that are to be controlled are connected to the microcontroller. The status of the device is sent on a web page that is being accessed by the user at the remote side. The commands given by the user at the remote client will be received by the microcontroller through Wi-Fi and get executed. This way control of the devices will take place.
1.1 INTRODUCTION OF EMBEDDED SYSTEMS
DEFINITION OF AN EMBEDDED SYSTEM :
Embedded system perform specific tasks. Simple embedded system contains input and output capability, as well as control logic. This system performs some type of functionality, based on it configuration. This new definition for an embedded system consists of input/output and control logic stored in system firmware. An embedded system is various types of computer system or computing device that performs a dedicated function and / or is designed for use with a specific embedded software application. Embedded systems may use a combination of 'Read-Only' as well as with 'Read-Write' based operating system. But an embedded system is not usable as a commercially viable substitute for general purpose devices or devices.
DEFINITION OF AN EMBEDDED OS:
An embedded operating system is the software program that manages all the other programs in an embedded device after initial load of programs by a boot loader. It normally guarantees and creating capability within a specified storage size and time constraint as well as with application programs. It also normally has small foot print including initial boot loader, OS kernel, required device drivers, file systems for the user data and so forth. It has very-likely structure of a normal operating system however mainly differentiated by some factors such as type of pre-installed device, functional limits, talking designed job only.
WHAT IS AN EMBEDDED SYSTEM?
An embedded system is an applied computer system as distinguished from other types of computer systems such as personal computers (PCs) or super computers.
EMBEDDED SYSTEMS ARE MORE LIMITED IN HARDWARE AND SOFTWARE FUNCTIONALITY THAN A PERSONAL COMPUTER(PC) :-
This holds true for a significant subset of the embedded systems family of computer systems . In terms of hardware limitations, this can mean limitations in processing performance, power consumption, memory, hardware functionality, and so forth. In system, this typically means limitations relative to a PC -fewer applications , scaled-down applications, no operating system(OS) or a limited OS, or less abstraction-level code. However, this definition is only partially true today as boards and software typically found in PCs of a fast and present have been repackaged into more complex embedded system designs.
AN EMBEDDED SYSTEM IS DESIGNED TO PERFORM A DEDICATED FUNCTION:-
We now see devices such as personal data assistant(PDA) /cell phone hybrids, which are embedded system designed to be able to do a variety of primary functions. Also ,the latest digital TVs include interactive applications that perform a wide variety of general functions unrelated to the “TV” function but just as important ,such as e-mail, web browsing and games.
AN EMBEDDED SYSTEM IS A COMPUTER SYSTEM WITH HIGHER QUALITY AND RELIABILITY REQUIREMENTS THAN OTHER TYPES OF COMPUTER SYSTEMS:-
Some families of embedded devices have a very threshold of quality and reliability requirements. For example, if a car's engine controller crashes while driving on a busy freeway or a critical medical device malfunctions during surgery, very serious problems result. However, there are also embedded devices, such as TVs, games, and cell phones in which a malfunction is an inconvenience but not usually a life-threatening situation.
EMBEDDED SYSTEMS MODEL:-
Within the scope of this book, a variety of architectural structures are used to introduce technical concepts and fundamentals of an embedded system. I also introduce emerging architectural tools(i.e., reference models) used as the
foundation for this architectural structures.
At the highest level, the primary architectural tool used to introduce the major elements located within man embedded system design is what I will refer to as the embedded system model .
EMBEDDED SYSTEM APPLICATIONS:-
 Telecommunication systems employ numerous embedded system from telephone switches for the network to mobile phones at the end-user.
 Consumer electronics include personal digital assistance (PDAs), mp3 players, mobile phones, video games consoles, digital cameras DVD players, GPS receivers and printers.
 Household appliances like the microwave ovens, washing machines or dish washers are including embedded system to add advanced functionality.
Advanced HVAC systems use networked thermostats to more accurately and efficiently control temperature that can change by time of a day and season. Home automation uses wired-and wireless-networking that can be used to control lights, climate, security ,audio/visual, etc. Medical equipment is continuing to advance with more embedded systems for vital signs monitoring, electronic stethoscopes for amplifying sounds, and various medical imaging (PET, SPECT, CT, MRI) for non-invasive internal inspections.
Principle
The main principle of this project is controlling and monitoring the devices in an industry using wi-fi technology which is a wireless technology. Here we are using the wi-fi transceivers which are used to send and receive the data. First of all, the ADC 0809 is connected to the three channels from the three sensors. Here the ADC is connected through the microcontroller. The microcontroller sends the data to the wi-fi transceiver at transmitter side and it is collected by the wi-fi transceiver at the receiver side because it is a wireless network and then sent to arm cortex processor which is used as a serial to Ethernet converter and the values are displayed on the PC in the form of web page. Here the three devices are connected to the controller by the help of relays which are connected through the ULN 2003.The sensor values are displayed in the webpage and through this we can control and also monitor the devices.