GSM BASED CAMPUS DISPLAY SYSTEM(cds)

Presented by:P.Likhitha

Introduction How it looks like? Why is this project? History of Wireless Communication Design overview How it works? Components Used AT Commands,control codes Applications &Usages Future scope Conclusion

CONTENTS

INTRODUCTION

•Communication technology over the years•Need of HMI• GSM Technology: GSM, which stands for global System for mobile

communications, reigns as the world’s most widely used cell phone technology.

• GSM based Campus display system at a glance.

HOW IT LOOKS LIKE?

HELLO TO JNTU WORLD EXTERNAL EXAMS FROM :02/06/2014

Why is this project?

The main aim of the project will be to design a SMS driven automatic display toolkit which can replace the currently used programmable electronic display.

It is proposed to design receive cum display toolkit which can be programmed from an authorized mobile phone.

What is GSM?

Global System for Mobile Communication (GSM) is a second generation cellular standard developed to cater voice services and data delivery using digital modulation.

Cell phones use a cell phone service carrier’s GSM network by searching for cell phone towers in the nearby area.

It operates at either the 900 MHz or 1800 MHz frequency band.

History of Wireless Communication

1) 1992 First GSM Network in the world2) 1993 GSM Network is reached 323) 1994 First GSM Network in Africa,4) 1995 GSM Network is reached 1175) 1998 120 Million User on the World6) 1999 First GPRS7) 1998 480 Million User on the World8) 2003 863 Million User on the World9) 2004 3G World Congress10) 2007 2.4 Billion users in the World

DESIGN OVERVIEW

HOW IT WORKS?

• The CDS mainly consists of a GSM receiver and a display toolkit which can be programmed from an authorized mobile phone

• It receives the SMS, validates the sending Mobile Identification Number(MIN)and displays the desired information after necessary code conversion.

• It can serve as an electronic notice board and display the important notices instantaneously thus avoiding the latency.

• Being wireless,the GSM based CDS is easy to expand and allows the user to add more display units at anytime and at any location in the campus depending on the requirement of the institute.

COMPONENTS USED

Microcontroller GSM Modem

MAX232 IC LCD Display

MICROCONTROLLER

AT89S52 microcontroller-a variant of 8052 8-bit microcontroller with 8KB on-chip Flash

memory,256 bytes RAM,three timer/counters ,one serial and four 8-bit parallel ports

It can also address up to 64KB of external data memory RAM and program memory

GSM MODEM

SIM 300 GSM Modem-Fixed Cellular Terminal for data applications Compact & portable ,easy to set up A wired connection at one end with the help of RS232C

serial port and wireless at the other Features like 1. SMS receiving2. call receiving

MAX232 IC

MAXIM 232-That converts signals from an RS-232 serial port to signals suitable for use in TTL compatible digital logic circuits

The MAX232 is a dual driver/receiver and typically converts the RX,TX,CTS and RTS signals.

It changes a TTL Logic 0 to between +3 and + 15V, and changes TTL Logic 1 to between -3 and -15V,and vice versa for converting from RS232 to TTL.

LIQUID CRYSTAL DISPLAY

HD44780 LCD for displaying the text data 16 Character*2 Line display module(But in practice, it should be replace by large multiline, multi-colour commercial display units).

AT COMMANDS

Computers use AT commands to control modems Both GSM modems and dial-up modems support a

common set of standard AT commands GSM modem can be used just like a dial-up modem.In

addition to the standard AT commands, GSM modems support an extended set of AT commands.These extended AT commands are predefined in the GSM

AT COMMANDS CLASSIFICATION

AT Commands

Test Read Set Execution

LIST OF IMPORTANT AT COMMANDS

Control Codes for LCD

CONTROL CODES OF LCD

Advantages

The Campus Display System is aimed at the colleges and universities for displaying day-to-day information continuously or at regular intervals during working hours.Display devices can be setup at various places in the campus.

Being GSM-based system, it offers flexibility to display flash news or announcements faster than a programmable system.

GSM-based campus display system can also be used at other public places like schools, hospitals ,railway stations ,gardens etc. Without effecting the surrounding environment.

APPLICATIONS

Commercial Display Board

Metro Bus Stations

APPLICATIONS

Future scope

Multiple receiver MODEMS at the different positions in geographical area carrying duplicate (cloned) SIM Cards

Multilingual display

Graphical display

Use of MMS Technology

FUTURE SCOPE

The prototype of the GSM based display toolkit was efficiently designed. This prototype has facilities to be integrated with a display board thus making it truly mobile

The toolkit accepts the SMS, stores it, validates it and then displays it in the LCD module. The SMS is deleted from the SIM each time it is read, thus making room for the next SMS.

The prototype can be implemented using commercial display boards. In this case, it can solve the problem of instant information transfer in the campus.

Conclusion

THANK YOU

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