GSM Based Campus Display system

“ GSM Based Campus Display System ”

Prepared by,

KASHYAP SHAH

(090300111022)

PRAGNESH GAJJAR

(090300111086)

YUVRAJ RATHOD

(090300111114)

Guided by,

Prof. Dilip H. Patel ( Internal guide )

Electronics & Communication Engineering DepartmentL.D.R.P Institute of Technology & Research, Gandhinagar

GSM BASED CAMPUS DISPLAY SYSTEM using Microcontroller AT89S52

: Presentation Outline :

Introduction

Design Overview

How it works ?

Demo

Components Used

AT Commands , Control codes

Applications & usages

Future scope

References

Introduction

Communication technology over the years

Wired and Wireless communication- Comparison

Need of HMI ( Human Machine Interface )

GSM Technology

GSM Based Campus display system at a glance

DESIGN OVERVIEW

MOBILE

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.

Control Flow chart

DEMO - HOW IT LOOKS LIKE ?

LCD 01: LDRP-ITR Department

WELCOME TO LDRP-ITR

Message Code: 0101*

MID SEM EXAM FROM DD-MM-YY

Message Code: 0102*

Here ‘ * ’ works as a termination character for SMS.

DEMO - HOW IT LOOKS LIKE ?

LCD 02: VPMP Department

Message Code: 0201*

Message Code: 0202*

Here ‘ * ’ works as a termination character for SMS.

WELCOME TO VPMP

ROBOTICS WORKSHOP

ANNOUNCEMENT

DEMO - HOW IT LOOKS LIKE ?

Message Code: 0302*

Message Code: 0301*

LCD 03: ADMIN Department

Here ‘ * ’ works as a termination character for SMS.

PAY YOUR FEES BYDD-MM-YY

COLLECT YOUR 6TH SEM MARKSHEETS

DEMO - HOW IT LOOKS LIKE ?

BROADCAST – All LCD displays the same message

KSV UNIVERSITY WELCOMES YOU

ALL

TOMORROW IS A HOLIDAY

Default Message Message Code: 0001*

Here ‘ * ’ works as a termination character for SMS.

SCHEMATIC DIAGRAM OF INTERFACING

COMPONENTS USED

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.

AT89S52 ( Atmel )

COMPONENTS USED

LCD

HD44780 LCD for displaying the text data

16 character x 2 line display module ( But in practice, it should be replace by the large multiline, multi- color commercial display units )

HD44780 LCD

COMPONENTS USED

MAX 232 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 +15 V, and changes TTL Logic 1 to between -3 to -15 V, and vice versa for converting from RS232 to TTL.

MAX232 IC

COMPONENTS USED

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 SMS receiving, call receiving.

COMPONENTS USED

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. 

Computer Interface

Finally, this project uses RS232 serial interface for interfacing the GSM modem with a PC. This interface is used to setup the GSM modem.

AT COMMANDS

AT commands are used to control MODEMs.

AT is the abbreviation for Attention. These commands come from Hayes commands that were used by the Hayes smart modems.

LIST OF IMP AT COMMANDS

 Call control : Data card Control :

Command Description

AT To check communication between computer and module.

ATD Dial Command

AT+CBC Battery charge

AT+CPAS Phone activity status

AT+CMGRAT+CMGS

Read messageSend message

AT+CLIP Calling line identification presentation

AT+CMGF Message format

 Call control : Data card Control :

 SMS Text mode :

The controller is programmed to send a fixed command ‘AT’ to the module.

The command AT is used to check the communication with module.

It returns a result code OK if the module and the controller are connected properly. If either of the module or SIM are not working, it returns a result code ERROR.

INTERFACING AT COMMANDS

CONTROL CODES FOR LCD

APPLICATIONS & USAGES

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 affecting the surrounding environment.

FUTURE SCOPE

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

Multilingual display

Graphical Display

Use of MMS technology

REFERENCES

http://en.wikipedia.org/

http://www.atmel.com/

http://images.google.com/

http://www.datasheetcatalog.com

http://www.keil.com/forum/docs

Datasheet: SIM 300 GSM MODEM Manual

Datasheet: ATMEL 89S52 Microcontroller

Datasheet: LCD HD44780

Datasheet: MAX 232