1 GSM BASED WIRELESS NOTICE-BOARD

Presentation BY: Sailesh Kutal (32528) Shiva Raj Luitel (32514) Sibendra Pokhrel (32515) Sujan Regmi (32517) Ranjit Thapa chhetri(32520)

2 SYSTEM OVERVIEW Introduction

Problem Statement

Objective

System Block Diagram

Operation algorithm

Operation flow diagram

System design and implementation

Conclusion

Limitations

Future Scope

References

3 Introduction

Wireless Notice Board Developed using

Microcontroller, GSM Module, LCD

TechniquesWireless using GSMSerial CommunicationTTL to RS232 Conversion

4 Problem Statement

Existing system

5 Problem with existing system

Based on paper, pin and staple Chance of losing notice sheet

6 Objective

To design system that displays digital information

To develop notice board featuring wireless technique

7 System Block Diagram

Power supply

8051 microcontroller

GSM module MAX 232 LCD

Display

8 Component Required: GSM Module SIM 900A

Microcontroller(8051)

Max 232

LCD (LM016)

Capacitors

Resistors

Connecting Wires

Headers (Males and Females)

PCB Board

9 GSM module

SIM 900A operates at 900MHz frequency.

Capability of auto synchronizing baud rate.

Serial interface in which modem can be controlled using AT command.

10MAX 232

Converts signals from an RS-232 serial port to signals suitable for use in TTL compatible digital logic circuits.

MICROCONTROLLER (8051)

Operating frequency for microcontroller 8051 is about 11.0592MHz

The peripheral devices like Max232 Module and LCD are interfaced with the Microcontroller through ports.

11LCD (LM016) 16x2 LCD represents 16 characters and 2 line

display

Receives the data from the microcontroller

and displays it after the execution of suitable

command by microcontroller.

7805 IC 7805 is an IC used to maintain the output voltage

at a constant value.

12 Operational Flow Diagram

System ON

Check power on signal and network signal at GSM module and then to the power supply

Type message in user mobile phone

AA

13

AA

Beep sound is produced by GSM after message is received

GSM module sends message to microcontroller using AT command

Microcontroller sends the data received to LCD for display

Display in LCD

14 Programming Algorithm

Initialize the LCD and UART protocol. Check for the command +CMTI: “SM”, (Location number)

to know whether the new message is received or not. If microcontroller receives the command, then store

message location number. Now read that particular location and extract the body of

the message. Display the message on LCD.

15 Attention Commands

+CMTI: "SM",1(message location) AT

OK (Carriage Return) AT+CMGF=1

OK(Carriage Return) AT+CMGR=”SM”

+CMGR: "REC UNREAD","+9779840059277","","16/07/28,22:04:17+23“

Final exam will start from Bhadra 21.

16 System Design And Implementation

1)Design consideration

Accessible to one who knows sim number of GSM module Requires continuous power system supply

17 2)Hardware Design And ImplementationDesign of Power Supply

18 Basic Operational Circuit for 8051

Actual Hardware Implementation

19 Overall Circuit diagram

20 Experimental Setup

21 Conclusion

Wireless Notice board developedUsing various electronic components Wireless techniques

22 Future Enhancement

Implement security featuresUse of LED matrix displayNotification System for new notice

23 Limitations

Displays limited characters only Unauthentic information by unauthorized personnel

24 References:

Mazadi(2007).Pearson Publication.Delhi Gunner_Heine(1998). Artech House Publisher.london Himanshu Chaudhary(2016).” How to interface GSM

module with 8051 microcontroller using PC”. GSM module interface. Engineering Garage http://www.engineersgarage.com/microcontroller/8051projects/gsm-interface-8051-microcontroller-circuit-code

Administrators (October 24, 2015).Wireless Electronic Noticeboard. Electronic Hub

http://www.electronicshub.org/wireless-electronic- notice-board-using-gsm/

25

Thank You