wireless notice board for public

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WIRELESS NOTICE BOARD USING GSM

GROUP MEMBER SEBIN.K.B.(NLAMEEE006)

GUIDED BY

JINU .K .T

Asst. professor

Dept. of EEE

NiCE

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INTRODUCTION

The main of the project will be design a GSM

BASED ELECTRONIC NOTICE DISPLAY

SYSTEM which can replace the currently used

programmable electronic display. It is designed for

displaying notices in college on electronic notice board

by sending messages in form of SMS through mobile , it

is a wireless transmission system which has very less

errors and maintenance.

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DESIGN OVERVIEW

The design of the project is basically divided into:

1. Transmitting Section

2. Receiving Section

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TRANSMITTING SECTION

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Transmitting Section consists of just mobile which has

inbuilt GSM modem for wireless data transfer through

GSM.

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RECEIVING SECTION

Microcontroller

MAX232

Mobile

Power Supply

LCD Display

RS-232 Cable

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CIRCUIT DIAGRAM

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THE MICROCONTROLLER

Microcontroller is the heart of the system. It is used for

interfacing the display, memory and other peripherals with

GSM modem.

The microcontroller used in this case is AT89c52. It is a

low-power,high performance CMOS 8-bitmicrocomputer

with 8K bytes of Flash programmable and erasable read

only memory. It is compatible with the industry-standard

80C51 and 80C52 instruction set and pin out.

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GSM MOBILE

A GSM mobile is used in our project to receive messages

at receiving section. GSM Mobile consists of GSM Modem.

It is a wireless modem that works with a GSM wireless

network. It sends and receives data through radio waves.

In our project, we are using gsm module and phone which

give compatible mobile devices wireless connectivity using

the GSM 850/900/1800/1900 MHz cellular net-works.

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DISPLAY UNIT (LCD ) 

One of the most common devices attached to an 8051 is

an LCD display.

Here we have used 16x2 compatible module, having 16

pins including 2 pins for backlight.

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MAX232

The MAX232 is a dual driver/receiver that includes a

capacitive voltage generator to supply EIA-232 voltage

levels from a single 5-V supply and converts EIA- 232

inputs to 5-V TTL/CMOS levels.

It is used to convert RS232 voltage to TTL voltage levels

and vice versa. We use PC's serial port to interface

microcontroller.

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In PC, at RS-232 voltage levels, logic 1 varies from -3 to

-15 volts and logic 0 from +3 to +15 volts.

The microcontroller which works on TTL logic levels,

logic 1 is +5 volts and logic 0 is 0 volts. Therefore to

interface the two we use a MAX 232 driver IC.

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POWER SUPPLY 

Power Supply is an important part of a circuit.

It provides required supply to different blocks of the circuit

from input 230 VAC.

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RS-232 CABLE

RS -232 is used to connect PC to microcontroller. It is

based on RS232 standard.

These can be classified as Data Terminal Equipment

(DTE) or Data Communication Equipment (DCE); this

defines at each device which wires will be sending and

receiving each signal.

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In general and according to the standard, terminals and

computers have male connectors with DTE pin functions, and

modems have female connectors with DCE pin functions

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APPLICATIONS  Educational Institutions and Organizations

Crime Prevention

Managing Traffic

Advertisement

Railway Station

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REFERENCE

•8051 microcontroller - M Mallikarjunaswamy, V Udayashankara•8051 microcontroller and embedded systems - Muhammad Ali Mazidi•http://www.electronicshub.org/wireless-electronic-notice-board-using-gsm/•http://www.edgefxkits.com/wireless-electronic-notice-board-by-gsm-with-user-programable-number-features•http://www.slideshare.net/dhanshri_deshmukh/wireless-electronic-notice-board-using-gsm-technolgy

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