DEPARTMENT OF ELECTRONIC SCINECEAKI’S POONA COLLEGE OF ARTS, SCIENCE &

COMMERCECAMP, PUNE-01

Completed By: Project Guide:Shaikh Abul Quais (2449) Prof.

SAJID NAEEMShaikh Faizan (2450)

M.Sc-II(Electronics)

A PROJECT PRESENTATION ON

MICROCONTROLLER BASED ROLLING DISPLAY WITH ANNOUNCEMENT SYSTEM

INTRODUCTION

Now a day, because of the many companies coming up, there are great needs for advertisements. Making banners every time is a very time- and money- consuming task. Using a reprogrammable microcontroller along with an LCD of appropriate size solves the problem to a huge extent. This system can be used on roads where huge banners are put up. Along with this system that I have designed and build consists of an extra added feature announcement. Thus, the whole system can be used in places like railway station, railways, bus stops, buses, hospitals, roads, banking, colleges & schools etc.

This system can not only display the message but also announce the message through the speaker.

If display is not working then speaker is there to announce the message and if there is problem in the voice processing unit or speaker then the LCD is there to display the message. This is a very useful facility in this system. Therefore the “Rolling Display with Announcement System” system is very useful

AIM & OBJECTIVES

AIM: The aim of this project is to develop microcontroller based Rolling Display with Announcement System.

OBJECTIVES: To study the 8 bit AT89S52 microcontroller. To study the recording IC APR9600. To design the interfacing of recording IC APR9600 with

AT89S52. To design the interfacing circuit of LCD to 8051

microcontroller. To develop the assembly language code for interfacing of

LCD and IC APR9600 to 8051 microcontroller. To design rolling display with announcement system by

using microcontroller 89S52 and APR9600 recording IC.

CONTENTS OF BLOCK DIAGRAM

POWER SUPPLYMICROCONTROLLER VOICE PROCESSING UNIT(APR9600)DISPLAYSPEAKER

1. POWER SUPPLY

TRANSFORMERRECTIFIERFILTERREGULATORLOAD

2. MICROCONTROLLER

Microcontroller has: CPU (microprocessor)RAM ROM I/O ports Timer ADC and other peripherals

History of the 8051

In 1981, Intel Corporation introduced an 8-bit microcontroller called the 8051.

This microcontroller had 128 bytes of RAM, 4K bytes of on-chip ROM, two timers, one serial port, and four ports (each 8-bits wide) all on a single chip.

The 8051 is an 8-bit processor, meaning that the CPU can work on only 8 bits of data at a time.

Data larger than 8 bits has to be broken into 8-bit pieces to be processed by the CPU.

The 8051 has a total of four I/O ports, each 8 bits wide.

Although the 8051 can have a maximum of 64K bytes of on-chip

ROM, many manufacturers have put only 4K bytes on the chip.

The 8051 became widely popular after Intel allowed other

manufacturers to make and market any flavors of the 8051 they

please with the condition that they remain code-compatible

with the 8051.

This has led to many versions of the 8051 with different speeds

and amounts of on-chip ROM marketed by more than half a

dozen manufacturers.

BLOCK DIAGRAM FEATURES

8051 MICROCONTROLLER

APLPLICATION Family of 8051

89C5189C5289C205189C205289S5189S52Etc…..

8051 MICROCONTROLLER

BLOCK DIAGRAM OF 89S52

3. VOICE PROCESSING UNIT (APR9600)

This block plays very important role in this system. The messages are recorded in the form of human voice by using a microphone.

For recording and replaying the messages APR9600 IC is used. APR9600 is a low-cost high performance sound record/replay IC

incorporating flash analogue storage technique. Recorded sound is retained even after power supply is removed from

the module. The APR9600 has a 28 pin DIP package as shown above. Supply

voltage is between 4.5V to 6.5V. During recording and replaying, current consumption is 25 mA. In idle mode, the current drops to 1 mA.

Total sound recording time can be varied from 32 seconds to 60 seconds by changing the value of a oscillation resistor.

The IC can be controlled simply using push button keys. It is also possible to control the IC using external digital circuitry such as micro-controllers and computers.

HOW APR9600 WORKS?

APR9600 works into two modes.1. Serial mode2. Parallel mode

In serial access mode, sound can be recorded in 256 sections.

In parallel access mode, sound can be recorded in 2, 4 or 8 sections.

These modes are selected using MSEL1 (Pin24), MSEL2 (Pin 25) and M8 (Pin 9).

Modes and selection of modes

Record sound tracks Circuit

MSEL1=1 MSEL2=1 –M8=1 RE=0. The maximum length of the 8

tracks is 7.5 seconds. Press M1 continuously and you will see BUSY LED illuminates. You can now speak to the microphone. Recording will terminate if –M1 is released or if the recording time exceeds 7.5 seconds. Similarly, press –M2 to -M8 to record other sound tracks.

Liquid Crystal Display(LCD)

The display used is 16*2 alphanumeric display.

Display

D7

14D6

13D5

12D4

11D3

10D2

9D1

8D0

7

E6

RW

5RS

4

VSS

1

VDD

2

VEE

3

LCD1LM016L

A liquid crystal has properties between a solid and a liquid.

It has properties more of a liquid.

It is more easily affected by temperature.

LIQUID CRYSTALS

A reflective mirror is setup at the bottom.

Above it a glass filter with a polarizing film on one side and an electrode on the other is kept.

The liquid crystal substance comes next followed by another piece of glass with an electrode towards the LC substance and a polarizing film on the other.

There is a cover glass which keeps the inside of the LCD intact.

Construction of LCD

When NO CURRENT:Light is passed through front of LCD It is reflected by the mirror and it bounces back.

When there is CURRENT:LC molecules ‘untwist’Light is blocked from passing through.Area becomes darker as compared to others n a

character is displayed on LCD.

Basic Operation

The speaker is used to announce or play the recorded message which is already stored in the APR9600 recording IC and which is displayed on the LCD. The speaker is playing most important role in this project. Speaker used is 8 ohm 1 watt speaker.

Speaker

Circuit Diagram

WORKING OF CIRCUIT

The data pins of LCD are connected to the Port0 of the microcontroller.

RS= P2.5 RW=P2.6 and EN= P2.7 Port1 is assigned for the message pins of APR9600. The APR9600 is used in random access mode(8 messages).The voice is recorded by using electrets microphone, while

recording the voice MSEL1=1, MSEL2=1, M8=1, RE=0. Press M1 continuously and you will see BUSY LED

illuminates. Now speak to the microphone. Recording is started, recording will terminate if M1 is released or if the recording time exceeds 7.5 seconds. press M2 to M8 to record other sound tracks.

Playing the stored messages

CE=0 to enable device & RE=1 to disable recording & enable playback.

By applying low to high signal to APR9600 message pins from microcontroller to play the desired message.

Messeges

Algorithm

Step1: Initialization of LCD.Step2: Wait for some time.Step3: Display welcome message.Step4: Initialization of LCD.Step5: Display “Next stop is:”Step6: Wait for some time.Step7: Display the Stop name.Step8: Give low to high pulse to APR9600 to play the

particular message which is displayed on LCD.Step9: Display the next stop name.Step10: Go to step8 to repeat the process 7 times again.Step 11: End

Flowchart

A

Initialize the LCD

Wait for some time

Display Welcome message

Wait for some time

Start

Define Port 0 as data lines of LCD

Define EN=P2.7RW=P2.6EN=P2.5

B

Send low to high pulse to apr9600 message pin with some delay in between

to play the particular message

Display the desired stop name on LCD in accordance with the announcement

Wait for some time

Repeat each announcement and rolling message 2 times

A

Display message“NEXT STOP IS”

Wait for some time

8 messages is finished????

Display message“NEXT STOP IS”

Stop

B

Wait for some time

Software

Kiel51 Compiler

Proteus 6.9 Simulator

Mc-Flash Programmer

Flash Magic Programmer

Express PCB

Delay Calculator

Hardware

PC

Target Board of microcontroller

Power Supply

PCB layout

Advantages

The system is easy to build and design.It requires less hardware.The code for rolling the message is easily

developed by using Assembly language.The system is not costly.It requires less power to operate.In case of power failure, it can be operated

on the battery supply.

Disadvantages

The main disadvantage of the system is the APR9600 is having time duration of 60 seconds only.

The sound quality is not good enough.If any of the message pin is pressed manually

in between the running system the particular message will be played.

APPLICATION

In Railway platforms for announcement and displaying the trains schedule.

In train buggies for displaying the station names.In Bus stops for announcement and displaying the buses

schedule.In Buses for displaying the stop names.In School for any type of notice and lecture time.In Colleges for any type of notice and lecture timeHospitalsRoadsShopsAnd many more applications are there.

PHOTOGRAPHS:

Future Scope

We can introduce the RF module in the system.

It can be accessed using GSM modules at any place at any time.

By adding GPS we can track our system.By using other type of voice recording IC

having duration of time large.We can use graphical LCD instead of

numerical LCD.We introduce the RTC for time management.

Conclusion

The “Rolling Display with Announcement System” is successfully designed, build and tested.

References

Introduction to Embedded SystemBy Mohammed Ali Mazidi

Embedded System by Raj KamalElectronic For You (Magazine)Chip Digit (Magazine)www.embeddedgarage.comwww.efy.co.in

THANK

YOU