This presentation outlines the design and implementation of a GSM-based electronic notice board. It uses a GSM modem interfaced with an ATmega 32 microcontroller via a MAX232 IC to receive and display SMS messages on a 16x2 LCD display. The system is initialized using AT commands to check connectivity. When a user sends an SMS, the message contents are displayed on the LCD. The microcontroller program uses string manipulation functions to extract and display the message. The electronic notice board can be used to display information in public places like colleges and hospitals.

1. A
PRESENTATION
ON
GSM BASED E-NOTICE BORAD
PRESENTED BY
ABHAY SINGH

2. PRESENTATION OUTLINE
INTRODUCTION
BLOCK DIAGRAM
DESIGN OVERVIEW
HOW IT WORK
CIRCUIT DIAGARM
CONTROL FLOWCHART
COMPONENT USED
SOFTWERE TOOLS
AT COMMANDS
APPLICATION&USESE
FUTURE SCOPE
REFERANCE

3. INTRODUCTION
In this project we are using GSM Modem(SIM
900) to receive SMS from user mobile and
display the message on LCD.
GSM is interfaced with Atmega 32
Microcontroller through Max232 integrated
circuit.

4. BLOCK DIAGRAM
ATmega 32
MCU
MAX232
INTERFACE
REGULATE POWER SUPPLY
16*2 LCD
DISPLAY
GSM
MODEM
ALARM

5. DESIGN OVERVIEW
MOBILE

6. HOW IT WORK
The GSM Modem is first properly initialized and
then it checks modem connectivity using AT
command. The program is written in ATmega32
microcontroller by using eclipse software.
After that user has to send SMS to GSM modem
and message contents are finally displayed on the
LCD display.
The data is sent to microcontroller through
MAX232 IC. MAX232 IC acts as logic level
shifter IC.

7. CIRCUIT DIAGARM

8. CONTROL FLOWCHART

9. PART OF PROGRAMING
Len=strlen(a); [find length of string]
For(i=72;i<=len;i++); [AT+CMGS…………_’MSG’]
{
If(strncmp(“HOD_EC_”,a,7);) [compare first N char of st.]
{
Sprintf (a,79,len);
LCDstring(a,16);
LCDright shift(a,16);
}
}

10. COMPONENT USED
Power supply
ATmega 32 Microcontroller.
LCD display.
MAX232IC.
GSM Modem(SIM900)

11. SOFTWERE TOOLS
ECLIPSE
SYNOPROG
XCTU

12. AT COMMANDS
AT commands are used to communicate between
controller and modems.
The controller is programmed to send a fixed command
‘AT’ to the GSM 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.

13. LIST OF IMPAT COMMANDS
Command Description
AT To check communication between
microcontroller and GSM module.
ATD Dial Command
AT+CBC Battery charge
AT+CPAS Phone activity status
AT+CMGR
AT+CMGS
Read message
Send message
AT+CLIP Calling line identification presentation
AT+CMGF Message format
AT+CMGD Previous message delete

14. APPLICATION&USAGE
GSM based E-notice board is used in colleges and
universities to display the day to day information
continuously .
It can be also used in other public place likes
hospital, railway stations, industries etc.
It can be used to control the traffic.

15. FUTURE SCOPE
Multiple receiver MODEMS at the different positions
in a geographical area carrying duplicate (cloned)
SIM Cards.
LED display can be used instead of LCD display
Use of MMS technology

16. REFERANCE
http://en.wikipedia.org/
http://www.atmel.com/
http://images.google.com/
http://www.datasheetcatalog.com

18. THANK
YOU
Sir
and
my friends