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Presented by:
P.ANUSHA

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CHAPTER 1
INTRODUCTION
1.1 INTRODUCTION
In this world of knowledge everything around us is run by Computing Systems. The technical Brilliance and Developments in different fields has led to a drastic change in our lives especially in the communications field. Due to various changes in technologies many systems have come up with breathtaking developments. One amongst them is the Embedded Systems. It is the evolution or further development of computing system. Its applications provide tremendous opportunities for creative use of computer technology. Almost every new system introduced in the market is an example of Embedded System.
An embedded system is a combination of computer circuitry and software that is built into a product for purposes such as control, monitoring and communication without human intervention. Embedded systems are at the core of every modern electronic product, ranging from toys to medical equipment to aircraft control systems.
In contrast to general-purpose computers, embedded systems perform a narrow range of pre-defined tasks. Thus, they usually do not have any of the typical computer peripheral devices such as a keyboard, display monitor, serial connections, mass storage (e.g., hard disk drives), etc. or any kind of user interface software, unless required by the product in which they are used in. This can make it possible to greatly reduce the complexity, size and cost and increase the robustness of embedded systems as compared with general purpose systems.
1.2 RF MODULE:
System is instantly updated--lag time between the physical movement of the product and the pdate to the system is removed, thus reducing errors and allowing for "real-time" adjustments. With this level of data communication, Accuplus RF allows for cross docking of products that don’t stay in the warehouse for more than a few hours.
1.3 SYSTEMS
 A system is something that maintains its existence and functions as a whole through the interaction of its parts. E.g. Body, Mankind, Access Control, etc.
 A system is a part of the world that a person or a group of persons during some time interval and for some purpose choose to regard as a whole, consisting of interrelated components, each component characterized by properties that are selected as being relevant to the purpose.
SYSTEM CONSTITUENTS:
Fig: 1 System Constituents
1.4 EMBEDDED SYSTEMS:
An embedded system can also be explained as a special-purpose system in which the computer is completely encapsulated by or dedicated to the device or system it controls. Unlike a general-purpose computer, such as a personal computer, an embedded system performs one or a few pre-defined tasks, usually with very specific requirements. Since the system is dedicated to specific tasks, design engineers can optimize it, reducing the size and cost of the product. Embedded systems are often mass-produced, benefiting from economies of scale

• We can define an embedded system as “a computing device built into a device that is not a computer, and meant for doing specific computing tasks”.
• An embedded system is a special purpose computer system usually built into an environment connected to systems through sensors, actuators and other I/O interfaces.
• Embedded system must meet timing and other constraints imposed on it by environment.
• In this we can use AT89S51 Micro controller.
EXAMPLES OF EMBEDDED SYSTEMS:
• Automatic teller machines (ATMs)
• Cellular telephones and telephone switches
• Handheld calculators
• Handheld computers
• Household appliances, including microwave ovens, washing machines, television sets, DVD players and recorders
• Medical equipment
• Personal digital assistant
• Videogame consoles
• Computer peripherals such as routers and printers
ORGANISATION OF THESIS:
The following will be a brief description of the contents of the report.
Chapter 1 deals with the block diagram of message circular system and brief introduction
about hardware components.
Chapter 3 gives a detailed explanation about the hardware components that are used in
the project.
Chapter3 gives a brief description about LCD.
Chapter5 describes Serial Communication.
Chapter6 describes the Software’s we used in the project.