20-04-2011, 04:58 PM
[attachment=12515]
Abstract
Wireless communication has announced its arrival on big stage and the world is going mobile. We want to control everything and without moving an inch. This remote control of appliances is possible through Embedded Systems. The use of “Embedded System in Communication” has given rise to many interesting applications that ensures comfort and safety to human life.
The main aim of this project will be to design a SMS driven automatic display board which can replace the currently used programmable electronic display. It is proposed to design receiver cum display board which can be programmed from an authorized mobile phone. The message to be displayed is sent through a SMS from an authorized transmitter. The microcontroller receives the SMS, validates the sending Mobile Identification Number (MIN) and displays the desired information. Started off as an instantaneous News display unit, we have improved upon it and tried to take advantage of the computing capabilities of microcontroller. Looking into current trend of information transfer in the campus, it is seen that important notice take time to be displayed in the notice boards. This latency is not expected in most of the cases and must be avoided. It is proposed to implement this project at the institute level. It is proposed to place display boards in major access points. The electronics displays which are currently used are programmable displays which need to be reprogrammed each time. This makes it inefficient for immediate information transfer, and thus the display board loses its importance. The GSM based display board can be used as an add-on to these display boards and make it truly wireless. The display board programs itself with the help of the incoming SMS with proper validation. Such a system proves to be helpful for immediate information transfer.
The system required for the purpose is nothing but a Microcontroller based SMS box. The main components of the kit include microcontroller, GSM modem. These components are integrated with the display board and thus incorporate the wireless features. The GSM modem receives the SMS. The AT commands are serially transferred to the modem through MAX232. In return the modem transmits the stored message through the COM port. The microcontroller validates the SMS and then displays the message in the LCD display board. Various time division multiplexing techniques have been suggested to make the display boards functionally efficient. The microcontroller used in this case is AT89s52. Motorola C168 is used as the GSM modem. In the prototype model, LCD display is used for simulation purpose. While implementation this can be replaced by actually display boards.
The data will be displayed only after entering unique pass key .In addition to that address matching is done and data can be receive only by the dedicated receiver , and this data is displayed on LCD.
The main focus of the thesis is on displaying information to a dedicated Lcd by the any part of world using GSM network, which facilitate to control any message board globally from any location.
Introduction
The project mainly focuses on transmission of textual data through air interface by the use of GSM through asynchronous serial communication .The data will be processed by the microcontroller on both ends. The data will be displayed on Lcd only after entering unique pass key. In addition to that address matching is done and data can be received only by the dedicated receiver.
Actually what happens is, sending sms through phone has become very popular and if we can use this sms to control devices and in displaying data. It is possible to receive or decode the sms globally by using gsm , by the any part of world we can control and display data on Lcd board .
In this project we not only send the data but send the data with pass code also. Which enables us to prevent the unauthorized use of Lcd display board and only the person who have pass code can have access to Lcd board . Important feature of thesis is we are using gsm network by which we can control Lcd display board by the any part of globe. If we must have the respected pass code. And the pass code is ok then the correct data is to be displayed on LCD.
HARDWARE USE
1. 1.2 : LIST OF COMPONENT
SOFTWARE USED
1. Keil u-Vision 3.0
Keil Software is used provide you with software development tools for 8051 based microcontrollers. With the Keil tools, you can generate embedded applications for virtually every 8051 derivative. The supported microcontrollers are listed in the µ-vision
2. PRO51 Programmer Software
THEORY OF OPERATION
In this project we interfaced 8051 microcontroller with Motorola’s C168 GSM mobile phone to decode the received message and do the required action. The protocol used for the communication between the two is AT command.
The microcontroller pulls the SMS received by phone, decode it, recognizes the
Mobile no. and then switches on the relays attached to its port to control the appliances. After successful operation, controller sends back the acknowledgement to the user’s mobile through SMS.
