PC BASED DIGITAL NOTICE BOARD WITH LCD DISPLAY

BY

A.VINAY KUMAR (10C21A0402)

CH.VENKATESH (10C21A0411)

S.SRAVANI (10C21A0452)

S.BHAVANA (10C21A0456)

INTERNAL GUIDE:K.MAHESH BABU,ASSOCIATE PROFDIP,B.E,M.TECH

CONTENTS Introduction and Objectives Technology Used Block diagram Description of block diagram Circuit Schematic Kit working snaps Advantages and Disadvantages Applications Conclusion Future scope

OBJECTIVES

In this Project, we are developing the PC based Digital Notice Board with LCD Display.

Here PC is connected to Micro controller through RS-232 cable.

If we type the message on the PC’s Hyper Terminal, the message will be received by the Microcontroller through serial communication and displayed on the LCD. 

TECHNOLOGY-SERIAL COMMUNICATION USING RS232

The concept behind serial communications is as follows, data is transferred from sender to receiver one bit at a time through a single line or circuit.

There are two basic types of serial communications, synchronous and asynchronous, here we use asynchronous serial communication.

Asynchronous means "no synchronization", however, the beginning and end of each byte of data must be identified by start and stop bits.

Asynchronous means that data is transferred without support from an external clock signal.

This transmission method is perfect for minimizing the required wires and I/O pins, but it does mean we need to put some extra effort into reliably transferring and receiving data. 

BLOCK DIAGRAM

DESCRIPTION-MICROCONTROLLER

A Microcontroller is a computer on chip device. The design incorporates all off the features found in microprocessor CPU, ALU, PC, SP and registers.

It also has built-in ROM, RAM, parallel I/O, Serial I/O, counters and clock circuits.

RS232

RS232 is a asynchronous serial communication protocol widely used in computers and digital systems.

So, It is called asynchronous because there is no separate synchronizing clock signal as there are in other serial protocols like SPI and I2C.

We can use RS232 to easily create a data link between our MCU based projects and standard PC

HYPERTERMINAL

HyperTerminal is a program that you can use to connect to other computers, Telnet sites, bulletin board systems (BBSs), online services, and host computers. HyperTerminal connections are made using a modem, a null modem cable (used to emulate modem communication), or an Ethernet connection.

HOW TO USE HYPERTERMINAL

Hyper Terminal, a Windows XP application, can be used to receive or transmit serial data through RS232. To open Hyper Terminal, go to Start Menu, select all programs, go to Accessories, click on Communications and select Hyper Terminal.

16x2 ALPHANUMERIC LCD DISPLAY LCD (Liquid Crystal Display)

screen is an electronic display module.

Here in this project we use LCD to display the message that has been transmitted.

A 16x2 LCD means it can display 16 characters per line and there are 2 such lines. In this LCD each character is displayed in 5x7 pixel matrix.

LCD PIN DIAGRAM

MAX 232

MAX232 is a level converter used for RS232.

Usually all the digital ICs works on TTL or CMOS voltage levels which cannot be used to communicate over RS-232 protocol.

So a voltage or level converter is needed which can convert TTL to RS232 and RS232 to TTL voltage levels. 

DB9-USB-RS232 MODULE

"DB9“ is D shape connector. DB9 connectors were commonly used for serial

peripheral devices like keyboards, mice, joysticks, etc. Also they are used on DB9 cable for data connectivity.

DB9 connectors are of two types

Male ports and Female ports.

DB9-USB-RS232 PINOUT

DB9-USB-RS232

MALE CONNECTER

DB9-USB-RS232 FEMALE CONNECTER

CIRCUIT SCHEMATIC

KIT WORKING SNAPSHOTS

ADVANTAGES

With rapid growth of technologies the commercial world requires a lot of advertisement ways and most of the market is covered with display boards.

The regular changing of the messages on an advertisement board manually consumes lot of man power and time.

In order to make this task simpler and cheaper we are designing a PC Based Embedded Application to display messages on the notice board.

OUR PROJECT

APPLICATIONS

Railway stations

Airports

Metro stations

CONCLUSIONS

In this project, we concluded that the message is displayed on the LCD .

Here the PC is connected to microcontroller through RS 232 cable.

If we type the message on PC’s hyper terminal , the message will be received by the microcontroller through serial communication and displayed on the LCD.

FUTURE SCOPE

We can add one more concept that user can sent 10 messages at a time with different styles.

Now we are displaying the messages in scrolling mode only, in future we can add so many designs so that user can send style command with message he wants to display the messages.

QUERIES??