GANDHI KARTHIK ARONLAVANYA

TEAM

GSM BASED NOTICE BOARD ON LED DISPLAY

Colpitts oscillator

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METHODOLOGY OBJECTIVE

DESCRIPTION

ADVANTAGESAPPLICATIONS

GSM BASED NOTICE BOARD ON LED DISPLAY

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BRIEF DESCRIPTION

• My project is a Scrolling (Moving) Message Electronic Display Board which displays the messages received as SMS .

• Public can send flash information from Mobiles to displays for instant viewing.

• Displays are designed to quickly display the information in the light emitting diode matrix display.

COMPONENTS SOFTWARES

Microcontroller (8051)

GSM Modem SIM LED MATRIX MAX 232 Power Supply

Keil u Vision Flash Magic

METHODOLOGY

User wants to display a message

User sends the message in his mobile defining the messages and then the password of the system to the number of the subscriber identity module (SIM) which is inserted in the display system

MODEM.

The GSM modem receives the SMS. The AT commands are serially transferred

to the modem through MAX232.

The microcontroller will read the message from serial headphone and

verify for the password, if the password is correct then it will start displaying the messages in the display system

Block Diagram:

KEY OBJECTIVES

1. Programming of the mobile phone with AT (Attention) command sequence

2. Interfacing the programming chip with the personal computer

3. Interfacing the programmable chip with the electronic board display

4. Interfacing of the mobile phone with the programmable chip

5. Sending messages from the remote phone to the electronic board

8051 MICROCONTROLLER Microcontroller is a small computer on a single

integrated circuit containing a processor core, memory and programmable I/O peripherals.

The 8051 microcontroller has Harvard architecture with RISC (Reduced Instruction Set Computer) concept.

The 89C51RB2/RC2/RD2 device contains a non-volatile 16kB/32kB/64kB Flash program memory that is both parallel programmable and serial In-System and In-Application Programmable.

8051 has 8-bit ALU which can perform all the 8-bit arithmetic and logical operations in one machine cycle. The ALU is associated with two registers A & B special function registers.

FEATURES

4 KB on chip program memory (ROM or EPROM)).

128 bytes on chip data memory (RAM).

8-bit data bus16-bit address bus32 general purpose

registers each of 8 bitsTwo -16 bit timers T0

and T1

Five Interrupts (3 internal and 2 external).

Four Parallel ports each of 8-bits (PORT0, PORT1, PORT2, PORT3) with a total of 32 I/O lines.

One 16-bit program counter and One 16-bit DPTR ( data pointer)

One 8-bit stack pointerOne Microsecond

instruction cycle with 12 MHz Crystal.

One full duplex serial communication port.

GSM modem• GSM Modem can accept any GSM network

operator SIM card and act just like a mobile phone with its own unique phone number. Advantage of using this modem will be that you can use its RS232 port to communicate and develop embedded applications.

• The modem can either be connected to PC serial port directly or to any microcontroller. It can be used to send and receive SMS or make/receive voice calls.

• It can also be used in GPRS mode to connect to internet and do many applications for data logging and control.

• This GSM modem is a highly flexible plug and play quad band GSM modem for direct and easy integration to RS232 applications.

MAX 232 DB9 Connector

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

The MAX232 is a dual driver/receiver and typically converts the RX, TX, CTS and RTS signals.

The MAX232(A) has two receivers, and two drivers .

The DB9 connector is an analog 9-pin plug of the D-Sub miniature connector family (D-Sub or Sub-D).

The DB9 connector is mainly used for serial connections, allowing for the asynchronous transmission of data as provided for standard RS-232 (RS-232C).

LED DOT MATRIX DISPLAY BOARD, 30 COLUMNS AND 7 ROWS. COLUMN ANODE AND ROW CATHODE

CONFIGURATION OF LED MATRIX

DISPLAY PATTERN FOR CHARACTER ‘A’DISPLAY PATTERN FOR THE ALPHABETS.

ROW SCANNING AND COLUMN DATA. DISPLAY AFTER SHIFTING 3 BITS OF CHARACTER ‘A’

DISPLAY BUFFER AFTER SHIFTING 3 BITS

SIM

The SIM is a detachable smart card containing the user's subscription information and phone book.

 It is an integrated circuit that securely stores the International Mobile Subscriber Identity (IMSI) and the related key used to identify and authenticate subscriber on mobile telephony devices.

PROGRAMMER

The programmer used is a powerful programmer for the Atmel 89 series of microcontrollers that includes 89C51/52/55, 89S51/52/55 and many more.

It will Program, Read and Verify Code Data, Write Lock Bits, Erase and Blank Check. All fuse and lock bits are programmable.

Major parts of this programmer are USB Port, Power Supply and Firmware microcontroller.

Serial data is sent and received to this programmer through the USB connector.

Programmer comes with window based software for easy programming of the devices.

APPLICATIONS AND ADVANTAGES : Banks

Effective traffic control

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Education sector

Information exchange

Stock exchanges

• Low cost• Flexible• Low power

consumption

Simplicity is the key to Victory.