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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.
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