Prepared by,

G.RAMA KRISHNA(10BQ1A0422),B.BALA CHAITANYA(11BQ5A0402),K.ARUN KUMAR(10BQ1A0442).

Guided by,KRISHNA PRASAD SATAMRAJU

Asst. Prof

MULTI-NOTICE DISPLAY BOARDS USING GSM

OBJECTIVE Notice Board is primary thing in any institution

or organization or public utility places like bus stations, railway stations and parks. But sticking various notices day-to-day is a difficult process.

A separate person is required to take care of this notices display. This project deals about an advanced hi-tech wireless notice board.

The project is built around a micro controller which provides all the functionality of the display and wireless control. Display is obtained on LCD

The advantage of this project being low cost and low power consumption

BLOCK DIAGRAM

NOTICE BOARD B20 X 4 LCD

AT 89S52

MICRO CONTROLLER

NOTICE BOARD A

20 X 4 LCD

POWER SUPPLY

GSM

MODES OF OPERATION

› SEND MESSAGE TO NOTICE BOARD A

› SEND MESSAGE TO NOTICE BOARD B

› SEND MESSAGE TO BOTH NOTICE BOARDS

MICROCONTROLLER AT89S52 The AT89S52 is a low-power, high-performance CMOS 8-bit

microcontroller with 8K bytes of in-system programmable Flash memory.

The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry- standard 80C51 instruction set and pinout.

FEATURES 8K Bytes of In-System Programmable (ISP) Flash Memory Endurance: 1000 Write/Erase Cycles 4.0V to 5.5V Operating Range 256 x 8-bit Internal RAM 32 Programmable I/O Lines Full Duplex UART Serial Channel Fully Static Operation: 0 Hz to 33 MHz

MICROCONTROLLER AT89S52 PIN DIAGRAM

20 X 4 LCD DISPLAY

VVIT PROJECT REVIEWS

GSM MODEM A GSM modem is a wireless

modem that works with a GSM wireless network.

It operates at either the 900MHz or 1800MHz frequency band.

It supports voice calls and data transfer speeds of up to 9.6kbits/s, together with the transmission of SMS (Short Message Service).

The GSM Modem comes with a serial interface which the modem can be controlled using AT command interface.

AT COMMANDS

INTERFACING WITH MAX 232

MAX 232

MAX 232 IC

• MAX 232 that converts signals from an RS-232 serial port to signals suitable for use in TTL compatible digital logic circuits.

• The MAX 232 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 +15 V, and changes TTL logic 1 to between -3 to -15V, and vice versa for converting from RS232 to TTL.

APPLICATIONS:

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 affecting the surrounding environment.

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THANK YOU