GSM BASED LED DISPLAY BOARD

MINI PROJECT

GSM MOBILE BASED LED SCROLLING DISPLAY BOARD

GUIDED BY

Sri C.HARINATHA REDDY M.Tech(Ph.D)

BYBatch : B10

P. Varun Kumar119X1A0273S. Sanath Kumar Reddy119X1A0295

INTRODUCTION

BLOCK DIAGRAM

GSM

RPS

MICROCONTROLLER

SOFTWARE

LED DISPLAY BOARD

DEMO

CONTENTS

INTRODUCTION

User wants to display a message in the led board

User sends the message from his mobile defining the message in the code format and then to the number of the subscriber identity module (SIM) which is inserted in the display system MODEM.

METHODOLOGY :

BLOCK DIAGRAM

MICRO CONTROLLER

PIC16F877A

RESET

CRYSTAL OSSCILLATOR

RPS

LCD DISPLAY

BUZZER

110*16 LED DISPLAY

BOARDGSM MODEM

5V SUPPLY5V SUPPLY

GSM modem SIM900A

GSM, which stands for Global System for Mobile communications, reigns as the

world’s most widely used cell phone technology. Cell phones use a cell phone service

carrier’s GSM network by searching for cell phone towers in the nearby area.

The power supply of SIM900A is 3.4V to 4.5V only.

Most 2G GSM networks operate in the 900 MHz bands.

A GSM network consists of several functional entities whose functions and

interfaces are defined. The GSM network can be divided into following broad parts.

· The Mobile Station (MS)

· The Base Station Subsystem (BSS)

· The Network Switching Subsystem (NSS)

· The Operation Support Subsystem (OSS)

.

Regulated Power Supply

TRANSFORMER

• It converts 230 v input supply to 12 v

Bridge Rectifier

•Converts 12 v AC to DC approximately 10.6 v

Filters(1000 uF)

•To minimize the ripple content in the rectifier output

7805 Voltage Regulators

•To get fixed voltage of 5 v supply

Circuit Diagram :

MICROCONTROLLER(PIC16F877A)

A microcontroller (sometimes abbreviated µC, uC or MCU) is a small computer on a single integrated circuit containing a processor core, memory, and programmable input/output peripherals.

PIC is a family of Harvard architecture microcontrollers made by Microchip Technology. The name PIC refers to "Peripheral Interface Controller".

We have many types of processors in markets in that few are given below

AT MEGA microcontroller

PIC microcontroller

ASIC (application specific microcontroller)

DSP (digital signal processor)

MICROCONTROLLER

FEATURES OF MICRO

CONTROLLER

35 single-word instructions to learn

Operating speed: DC – 20 MHz clock input

DC – 200 ns instruction cycle

Up to 8K x 14 words of Flash Program memory

Up to 368 x 8 bytes of Data Memory (RAM),

Up to 256 x 8 bytes of EEPROM Data

Memory

PIC16F877A

1,000,000 erase/write cycle Data EEPROM memory

typical

Data EEPROM Retention > 40 years

Self-reprogrammable under software control

In-Circuit Serial Programming™ (ICSP™) via two

pins

Single-supply 5V In-Circuit Serial Programming

Watchdog Timer (WDT) with its own on-chip RC

oscillator for reliable operation

Programmable code protection

Power saving Sleep mode

MAIN FEATURES OF

PIC uC

Low cost

User friendly

Easily available in market

We can reprogram it up to 1000 times

Less power consumption

Brown-out defect and Power on resetEvery pin have an extra capability up

to 25mA

In built oscillator of 4MHz and

externally crystal oscillator of 20MHz

ADC channels are inbuilt

DEMO-How it look like ?

GPREC Notice Board

Tomorrow is Holiday

GPREC Notice Board

WELCOMES YOU ALL

ANY QUERIES ?

THANK YOU