Aim :
Main aim of this project is to develop an embedded system to send a message from block spot area using GSM and ZIGBEE.
Description :
Block spot is nothing but an area where we could not find any signal. Even in cities also sometimes we may not have signals inside the room. Through such area sending or calling is tedious. Here our project is useful to create a signal and sending SMS
In this work mainly we will use two different frequencies like GSM(1800MHz) and ZIGBEE(2.4GHz). by using these 2 wireless communications first we will create a signal in between zigbee and message will be sent through GSM.
Operation :
In this project we are having 2 embedded developed boards, one contains ZIGBEE and keypad and the other contains ZIGBEE and GSM. The first board we will place at black spot area and the second board we will place in the signal area. Whenever we will type a message and press an enter button in the first board it will sends the information to the other zigbee board where a GSM is also arranged and the GSM will sends the message for the destination mobile
The system uses a compact circuitry built around flash version of at89s52 microcontroller with a non-volatile memory capable of retaining the password data for over ten years. The user can modify the password. Programs are developed in embedded c. Isp is used to dump the code into the microcontroller.
Embedded Systems
INTRODUCTION TO EMBEDDED SYSTEMS
Each day, our lives become more dependent on ’embedded systems’, digital information technology that is embedded in our environment. More than 98% of processors applied today are in embedded systems, and are no longer visible to the customer as ‘computers’ in the ordinary sense. An Embedded System is 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. The increasing use of PC hardware is one of the most important developments in high-end embedded systems in recent years. Hardware costs of high-end systems have dropped dramatically as a result of this trend, making feasible some projects which previously would not have been done because of the high cost of non-PC-based embedded hardware. But software choices for the embedded PC platform are not nearly as attractive as the hardware.
Definition of an Embedded System
Embedded system is defined as, For a particular/specific application implementing the software code to interact directly with that particular hardware what we built. Software is used for providing features and flexibility, Hardware = {Processors, ASICs, Memory,…} is used for Performance (& sometimes security)
There are many definitions of embedded system but all of these can be combined into a single concept. An embedded system is a special purpose computer system that is used for particular task.
Features of Embedded Systems
The versatility of the embedded computer system lends itself to utility in all kinds of enterprises, from the simplification of deliverable products to a reduction in costs in their development and manufacture. Complex systems with rich functionality employ special operating systems that take into account major characteristics of embedded systems. Embedded operating systems have minimized footprint and may follow real-time operating system specifics.
The special computers system is usually less powerful than general-purpose systems, although some expectations do exist where embedded systems are very powerful and complicated. Usually a low power consumption CPU with a limited amount of memory is used in embedded systems. Many embedded systems use very small operating systems; most of these provide very limited operating system capabilities.
Since the embedded system is dedicated to specific tasks, design engineers can optimize it, reducing the size and cost of the product, or increasing the reliability and performance. Some embedded systems are mass-produced, benefiting from economies of scale.