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. .

1. Presented by:
P.Likhitha

2.  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

3. • 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.

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

5. 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.

6. 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.

7. 1) 1992 First GSM Network in the world
2) 1993 GSM Network is reached 32
3) 1994 First GSM Network in Africa,
4) 1995 GSM Network is reached 117
5) 1998 120 Million User on the World
6) 1999 First GPRS
7) 1998 480 Million User on the World
8) 2003 863 Million User on the World
9) 2004 3G World Congress
10) 2007 2.4 Billion users in the World

9. • 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.

11.  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

12. 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 receiving
2. call receiving

13.  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.

14. 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).

15.  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

16. AT Commands
Test Read Set Execution

18. Control Codes for LCD

19. 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.

20. Commercial Display Board Metro Bus Stations

21. 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

22. 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

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