This document describes the design of a GSM-based electronic notice display system. The system has two main sections - a transmitting section consisting of a mobile phone with a GSM modem, and a receiving section with a microcontroller, GSM modem, LCD display, and other components. The receiving section interfaces with the GSM network to receive text messages and display notices on the LCD screen. Key components of the receiving section include an AT89c52 microcontroller, MAX232 converter, 16x2 LCD, and power supply. The system allows wireless transmission of notices to an electronic display board via SMS, providing a lower maintenance alternative to traditional programmable displays.

1. GROUP MEMBER
SEBIN.K.B.(NLAMEEE006)
GUIDED BY
JINU .K .T
Asst. professor
Dept. of EEE
NiCE
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2. 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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3. DESIGN OVERVIEW
The design of the project is basically divided into:
1. Transmitting Section
2. Receiving Section
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5. TRANSMITTING SECTION
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Transmitting Section consists of just mobile which has
inbuilt GSM modem for wireless data transfer through
GSM.

6. RECEIVING SECTION
Microcontroller
MAX232
Mobile
Power Supply
LCD Display
RS-232 Cable
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8. 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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10. 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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12. 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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14. 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.

16. 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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18. 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

20. 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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