26-04-2011, 11:56 AM
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INTRODUCTION
1.1 General Introduction:
In today’s world it is said that, world is shrinking day by day. It is due to the fact that people from different parts of the world are able to communicate with each other within fractions of seconds. All these advantages are possible due to the advantages in digital communication techniques. With the advent of cellular technology the use of mobile telephones are increased drastically over the years. In today’s world of technological advancements communications and control is necessary in any part of the world.
The novel idea of this project is to receive message through mobile phones and send it to Notice Board for display. This project is basically a micro controller- based design used to control remote notice board. P89C52RD2BN is heart of this project. Here, we use mobile phones as a message sender, sending messages to notice board by sending appropriate SMS and receiving SMS whenever there is no problem. The mobile used is GSM technology.
The key strength of GSM is its international roaming capability giving consumers a seamless service, superior speech quality, universal and in-expensive mobile phones, Digital convenience, New services(Call waiting , Call forwarding, SMS). SMS is a GSM service by which we can send and receive data, to and from another GSM handset. The message can be comprised of words or numbers or an alpha numerical combination.
The main advantage of SMS service are it’s an available communication tool those with speech or hearing difficulties. And if you get an SMS and you are outside of the GSM coverage area SMS will be stored and you will be received it as soon as you entered the network coverage area. This will always keep you aware of the security situation of your home/office.
Using “attention commands” (AT Commands) GSM modem operations can be controlled.
1.2 Objective of the study:
The main objective of selecting this project is to gain knowledge and experience in developing a real time application. Apart from this, to gain the Knowledge of P89C52RD2BN Micro Controller, GSM modem and the way in which these can be used to receive messages and display on notice board.
8052 is a popular micro controller. There are number of 8052 applications. Micro controller can be programmed to run only one specific application.. It can be programmed to accomplish the specific job faster.
GSM modems are widely used in mobile phones. The working of the modem can be controlled by “AT” commands. There are many “AT” commands like “AT+CMGR” to read a message etc.
1.3 Scope of literature:
System using GSM includes only three applications. Notice Board are connected to the system just to show that, it is possible to control various notice board using micro controller.
In this project the software has been written to send and receive messages. When a message has to be sent a command is sent to the GSM modem. But, this project would not guarantee, that the message sent would reach the destination, if GSM service does not exist. This is not in the scope of this project.
1.4 Review of the Project:
Many books have provided valuable information that was very useful for this project.
One such book authored by MD. ALI MAZIDI and JANICE GILLIPSE MAZIDI titled “THE 8052 MICRO CONTROLLER AND EMBEDED SYSTEMS”.
1.5 Introduction to EMBEDED SYSTEMS:
Embedded systems are designed to do some specific task, rather than be a general-purpose computer for multiple tasks. Some also have real time performance constraints that must be met, for reason such as safety and usability; others may have low or no performance requirements, allowing the system hardware to be simplified to reduce costs.
An embedded system is not always a separate block - very often it is physically built-in to the device it is controlling. The software written for embedded systems is often called firmware, and is stored in read-only memory or flash convector chips rather than a disk drive. It often runs with limited computer hardware resources: small or no keyboard, screen, and little memory.
Wireless communication has become an important feature for commercial products and a popular research topic within the last ten years. There are now more mobile phone subscriptions than wired-line subscriptions. Lately, one area of commercial interest has been low-cost, low-power, and short-distance wireless communication used for \personal wireless networks." Technology advancements are providing smaller and more cost effective devices for integrating computational processing, wireless communication, and a host of other functionalities. These embedded communications devices will be integrated into applications ranging from homeland security to industry automation and monitoring. They will also enable custom tailored engineering solutions, creating a revolutionary way of disseminating and processing information. With new technologies and devices come new business activities, and the need for employees in these technological areas. Engineers who have knowledge of embedded systems and wireless communications will be in high demand. Unfortunately, there are few adorable environments available for development and classroom use, so students often do not learn about these technologies during hands-on lab exercises. The communication mediums were twisted pair, optical fiber, infrared, and generally wireless radio.
CHAPTER 2
DESIGN
The systems design process partitions the requirements to either hardware or software systems. It establishes the overall system architecture. Software design involves the representing the software system functions in a form that may be transformed into one or more executable programs. The design involves the design of hardware as well as software part required for the project.
2.1 Block Diagram:
[b]Receiver:
Transmitter:
2.2 Design Process:
Design Process
Hardware Design
Software Design
2.3 Hardware Design:
2.3.1 Microcontroller Introduction:
Features: [/b]
• Compatible with MCS-51™ Products
• 8K Bytes of In-System Reprogrammable Flash Memory
• Endurance: 1,000 Write/Erase Cycles
• Fully Static Operation: 0 Hz to 24 MHz
• Three-level Program Memory Lock
• 256 x 8-bit Internal RAM
• 32 Programmable I/O Lines
• Three 16-bit Timer/Counters
• Eight Interrupt Sources
• Programmable Serial Channel
• Low-power Idle and Power-down Modes
Description:
The AT89C52 is a low-power, high-performance CMOS 8-bit microcomputer with 8K bytes of Flash programmable and erasable read only memory (PEROM). The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 and 80C52 instruction set and pinout.The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C52 is a powerful microcomputer which provides a highly-flexible and cost-effective solution to many embedded control applications.
The AT89C52 provides the following standard features: 8K bytes of Flash, 256 bytes of RAM, 32 I/O lines, three 16-bit timer/counters, a six-vector two-level interrupt architecture, a full-duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT89C52 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning. The Power-down mode saves the RAM contents but freezes the oscillator, disabling all other chip functions until the next hardware reset.
INTRODUCTION
1.1 General Introduction:
In today’s world it is said that, world is shrinking day by day. It is due to the fact that people from different parts of the world are able to communicate with each other within fractions of seconds. All these advantages are possible due to the advantages in digital communication techniques. With the advent of cellular technology the use of mobile telephones are increased drastically over the years. In today’s world of technological advancements communications and control is necessary in any part of the world.
The novel idea of this project is to receive message through mobile phones and send it to Notice Board for display. This project is basically a micro controller- based design used to control remote notice board. P89C52RD2BN is heart of this project. Here, we use mobile phones as a message sender, sending messages to notice board by sending appropriate SMS and receiving SMS whenever there is no problem. The mobile used is GSM technology.
The key strength of GSM is its international roaming capability giving consumers a seamless service, superior speech quality, universal and in-expensive mobile phones, Digital convenience, New services(Call waiting , Call forwarding, SMS). SMS is a GSM service by which we can send and receive data, to and from another GSM handset. The message can be comprised of words or numbers or an alpha numerical combination.
The main advantage of SMS service are it’s an available communication tool those with speech or hearing difficulties. And if you get an SMS and you are outside of the GSM coverage area SMS will be stored and you will be received it as soon as you entered the network coverage area. This will always keep you aware of the security situation of your home/office.
Using “attention commands” (AT Commands) GSM modem operations can be controlled.
1.2 Objective of the study:
The main objective of selecting this project is to gain knowledge and experience in developing a real time application. Apart from this, to gain the Knowledge of P89C52RD2BN Micro Controller, GSM modem and the way in which these can be used to receive messages and display on notice board.
8052 is a popular micro controller. There are number of 8052 applications. Micro controller can be programmed to run only one specific application.. It can be programmed to accomplish the specific job faster.
GSM modems are widely used in mobile phones. The working of the modem can be controlled by “AT” commands. There are many “AT” commands like “AT+CMGR” to read a message etc.
1.3 Scope of literature:
System using GSM includes only three applications. Notice Board are connected to the system just to show that, it is possible to control various notice board using micro controller.
In this project the software has been written to send and receive messages. When a message has to be sent a command is sent to the GSM modem. But, this project would not guarantee, that the message sent would reach the destination, if GSM service does not exist. This is not in the scope of this project.
1.4 Review of the Project:
Many books have provided valuable information that was very useful for this project.
One such book authored by MD. ALI MAZIDI and JANICE GILLIPSE MAZIDI titled “THE 8052 MICRO CONTROLLER AND EMBEDED SYSTEMS”.
1.5 Introduction to EMBEDED SYSTEMS:
Embedded systems are designed to do some specific task, rather than be a general-purpose computer for multiple tasks. Some also have real time performance constraints that must be met, for reason such as safety and usability; others may have low or no performance requirements, allowing the system hardware to be simplified to reduce costs.
An embedded system is not always a separate block - very often it is physically built-in to the device it is controlling. The software written for embedded systems is often called firmware, and is stored in read-only memory or flash convector chips rather than a disk drive. It often runs with limited computer hardware resources: small or no keyboard, screen, and little memory.
Wireless communication has become an important feature for commercial products and a popular research topic within the last ten years. There are now more mobile phone subscriptions than wired-line subscriptions. Lately, one area of commercial interest has been low-cost, low-power, and short-distance wireless communication used for \personal wireless networks." Technology advancements are providing smaller and more cost effective devices for integrating computational processing, wireless communication, and a host of other functionalities. These embedded communications devices will be integrated into applications ranging from homeland security to industry automation and monitoring. They will also enable custom tailored engineering solutions, creating a revolutionary way of disseminating and processing information. With new technologies and devices come new business activities, and the need for employees in these technological areas. Engineers who have knowledge of embedded systems and wireless communications will be in high demand. Unfortunately, there are few adorable environments available for development and classroom use, so students often do not learn about these technologies during hands-on lab exercises. The communication mediums were twisted pair, optical fiber, infrared, and generally wireless radio.
CHAPTER 2
DESIGN
The systems design process partitions the requirements to either hardware or software systems. It establishes the overall system architecture. Software design involves the representing the software system functions in a form that may be transformed into one or more executable programs. The design involves the design of hardware as well as software part required for the project.
2.1 Block Diagram:
[b]Receiver:
Transmitter:
2.2 Design Process:
Design Process
Hardware Design
Software Design
2.3 Hardware Design:
2.3.1 Microcontroller Introduction:
Features: [/b]
• Compatible with MCS-51™ Products
• 8K Bytes of In-System Reprogrammable Flash Memory
• Endurance: 1,000 Write/Erase Cycles
• Fully Static Operation: 0 Hz to 24 MHz
• Three-level Program Memory Lock
• 256 x 8-bit Internal RAM
• 32 Programmable I/O Lines
• Three 16-bit Timer/Counters
• Eight Interrupt Sources
• Programmable Serial Channel
• Low-power Idle and Power-down Modes
Description:
The AT89C52 is a low-power, high-performance CMOS 8-bit microcomputer with 8K bytes of Flash programmable and erasable read only memory (PEROM). The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 and 80C52 instruction set and pinout.The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C52 is a powerful microcomputer which provides a highly-flexible and cost-effective solution to many embedded control applications.
The AT89C52 provides the following standard features: 8K bytes of Flash, 256 bytes of RAM, 32 I/O lines, three 16-bit timer/counters, a six-vector two-level interrupt architecture, a full-duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT89C52 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning. The Power-down mode saves the RAM contents but freezes the oscillator, disabling all other chip functions until the next hardware reset.
