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  • Topic: Rectifier, Direct current, Power supply
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  • Published : January 4, 2013
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Chapter 1
Introduction
1.1 Introduction:
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 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 we can use this sms to control devices and in displaying data.It is possible to receive or decode the sms globaly by using GSM , by the any part of world we can control and display data on LCD board. 1.2 Aim of Thesis:

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.

1.3 Technical Approach:
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. 1.4 Block Diagram Of SMS Based E-Notice Board:

Figure 1.1 Block Diagram Of SMS Based E-Notice Board

1.5 Block Diagram Description:
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.

Chapter 2
Theoretical Overview
2.1Introduction:
In this chapter we are going to discuss about the hard ware components included in...
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