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7/31/2019 Moving Message

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To Display the time and Date information on the

LED MATRIX display

To display the messages that are sent through the

computer via serial port

To display the messages that are sent through the

mobile in the form of SMS


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MICROCONTROLLER

P89V51RD2

DRIVER

(SOURCECURRENT)

ROW

Serial

CommunicationRs232

DRIVER(SINK

CURRENT)

COLUMN

DECODER

4:16

LED

MATRIX8X8

(MULTIPLEXED)

GSM

MODEM

RTC

AND

EEPROM

I2C BUS


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Source

Current


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5 V Operating voltage from 0 to 40 MHz

64 KB of on-chip Flash program memory with ISP (In-System Programming) and

IAP (In-Application Programming)

1KB of data RAM

Supports 12-clock (default) or 6-clock mode selection via software or ISP

SPI (Serial Peripheral Interface) and enhanced UART

Four 8-bit I/O ports with three high-current Port 1 pins (16 mA each)

Three 16-bit timers/counters

Programmable Watchdog timer (WDT)

Eight interrupt sources with four priority levels

TTL- and CMOS-compatible logic levels


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The GSM unit contains a GSM module along with a GSM transmitter antenna.

The module functions according to its built and the antenna transmits the information

to the Base Station wherein this is exposed to further processing.

The GSM module that we are using in this unit is the SIMCOM SIM300 module.

It works on frequencies EGSM 900 MHz, DCS 1800 MHz and PCS1900 MHz.

SIM300 provide RF antenna interface with two alternatives: antenna connector and

antenna pad

SMS is one of the unique features of GSM compared to older analog systems.

The communication between the microcontroller and the GSM modem takes place

Serially at an baud rate of 9600bps.


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We use AT commands to control and program the SIMCOM

SIM300 module.

The main AT commands for using SMS are listed below.

AT Command for checking whether the GSM

Modem is properly working it returns a

O.K if it is working properly otherwiseerror is received

ATH Disconnect existing connection

AT+CMGS Send SMS command

AT+CMGR Read SMS Command


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FEATURES:

Real-Time Clock (RTC) Counts Seconds, Minutes, Hours,

Date of the Month, Month, Day of the week and year

56-Byte, Battery-Backed, General-Purpose RAM with Unlimited Writes

I2C Serial Interface

Programmable Square-Wave Output Signal

Automatic Power-Fail Detect and Switch Circuitry

Consumes Less than 500nA in Battery-Backup Mode with Oscillator Running


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Internally Organized 4096 x 8, 8192 x 8

2-Wire Serial Interface

Schmitt Trigger, Filtered Inputs for Noise Suppression

Bidirectional Data Transfer Protocol

100 kHz (1.8V, 2.5V, 2.7V) and 400 kHz (5V) Clock Rate

Write Protect Pin for Hardware Data Protection

32-Byte Page Write Mode (Partial Page Writes Allowed)


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In Schools And Colleges

In Hospitals

In Temples

In Hotels

In Shops


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