HINDUSTAN INSTITUTE OF TECHNOLOGYGREATER NOIDA

MINI PROJECTBy:

ASHUTOSH SINGH & AKASH CHANDELB TECH 4th YEAR EC(A)

SYNOPSIS OF GSM BASED ELECTRONIC NOTICE BOARD

CONTENTS

1. INTRODUCTION

2. THEORETICAL BACKGROUND

3. TECHNICAL DETAILS

3. CONCLUSION

INTRODUCTIONA brief descriptionBlock DiagramMethodologyKey objectivesUses of the project

My project is a Scrolling (Moving) Message Electronic Display Board which displays the messages received as SMS or GPRS Packets.

Public can send flash information from Mobiles or PCs to displays for instant viewing.

Displays are designed to quickly display large amounts of information in the liquid crystal display.

A BRIEF DESCRIPTION

Based on the principle of serial communication in collaboration with embedded systems.

This project is an implementation to the idea of the wireless communication between a mobile phone and a microcontroller.

It uses:a) A moving message display, which will be used as the digital notice boardb) A GSM modem, Motorola C168 , which is the latest technology used for communication between the mobile and the embedded devices. c) Microcontroller, ATMEL AT89S52

BLOCK DIAGRAM

User wants to display a message

User sends the message in his mobile defining the messages and then the password of the system to the number of the subscriber identity module

(SIM) which is inserted in the display system MODEM.

METHODOLOGY

The GSM modem receives the SMS. The AT

commands are serially transferred to the modem

through MAX232.

The microcontroller will read the message from serial

headphone and verify for the password, if the password is

correct then it will start displaying the messages in the

display system

1. Programming of the mobile phone with AT (Attention) command sequence

2. Interfacing the programming chip with the personal computer

3. Interfacing the programmable chip with the electronic board display

4. Interfacing of the mobile phone with the programmable chip

5. Sending messages from the remote phone to the electronic board

KEY OBJECTIVES

Banks

Effective traffic control

Advertisements

Education sector

Information exchange

Stock exchanges

USES OF THE PROJECT

THEORETICAL BACKGROUND

GSMSIMProgrammer

GSM (Global System for Mobile communications: originally from GROUPE Spécial Mobile) is the most popular standard for mobile phones in the world.

GSM differs from its predecessors in that both signaling and speech channels are digital, and thus is considered a second generation (2G) mobile phone system.

Most 2G GSM networks operate in the 900 MHz or 1800 MHz bands.

The modulation used in GSM is Gaussian minimum-shift keying (GMSK), a kind of continuous-phase frequency shift keying.

GSM

The SIM is a detachable smart card containing the user's subscription information and phone book.

 It is an integrated circuit that securely stores the International Mobile Subscriber Identity (IMSI) and the related key used to identify and authenticate subscriber on mobile telephony devices.

SIM

The programmer used is a powerful programmer for the Atmel 89 series of microcontrollers that includes 89C51/52/55, 89S51/52/55 and many more.

It will Program, Read and Verify Code Data, Write Lock Bits, Erase and Blank Check. All fuse and lock bits are programmable.

Major parts of this programmer are USB Port, Power Supply and Firmware microcontroller.

Serial data is sent and received to this programmer through the USB connector.

Programmer comes with window based software for easy programming of the devices.

PROGRAMMER

TECHNICAL DETAILSTentative model to be employedMain Circuit BoardTechnical Specifications

TENTATIVE MODEL

MAIN CIRCUIT BOARD

TECHNICAL SPECIFICATIONS

CONCLUSIONS Advantages Limitations

ADVANTAGES LIMITATIONS

This prototype has facilities to be integrated with a display board thus making it truly mobile.

The SMS is deleted from the phone each time it is read, thus making room for the next SMS.

The systems need not be reprogrammed to display new messages because it is wireless.

Communications between the subscriber and the base station can be encrypted.

Currently the main work that has been done on this proposed system is through serial port to the computer but not wireless.

The major constraints incorporated are the use of ‘*’ as the termination character of the SMS and the display of one SMS as at a time.

These limitations can be removed by the use of higher end microcontrollers and extended RAM.