Bluetooth Controlled Notice Board Using Dot Matrix

Submitted in partial fulfillment of the requirements for the award of the

degree of

BACHELOR OF TECHNOLOGY
IN

ELECTRONICS AND COMMUNICATION ENGINEERING

Under the guidance of

Dr. Neeru Sharma

Assistant Professor (Senior Grade)

By

Nipun Aggarwal (141085)

Shashi Shekhar Shukla (141090)

Raaj (141098)

JAYPEE UNIVERSITY OF INFORMATION TECHNOLOGY

WAKNAGHAT, SOLAN – 173234

HIMACHAL PRADESH, INDIA

 Candidate’s Declaration

I hereby declare that the work presented in this report entitled “IOT Based Air and Sound

Pollution Monitoring System” in partial fulfillment of the requirements for the award of
the degree of bachelor of technology in electronics and communication engineering submitted at
Jaypee University of Information Technology, Vaknaghat India, is an authentic

record of my work carried out over a period from July 2017 to May 2018 under the supervision of Dr .

Neeru Sharma (Assistant Professor, E.C.E Department) . The matter embodied in the
report has not been for the award of any other degree or diploma

Nipun Aggarwal Shashi Shekhar Shukla Raaj

(141085) (141090) (141098)

This is to certify that above statement made by the candidate is true to the best
of my knowledge.

Dr. Neeru Sharma

Assistant Professor (Senior Grade)

Electronics and Communication Engineering

Jaypee University of Information Technology, Waknaghat, India

Dated:

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 Acknowledgement

We would like to express our special gratitude to our project coordinator Dr.Neeru
Sharma who helped us in to form a concept and idea of the project and actual building of
steps used to complete the project. We would also like to thank our Head of Department
for providing us this golden opportunity to work on a project like this.

This project would have been impossible if it was not for the kind support, extreme
support and continuous counsel of my learned project guide. The deep sense of
heartfelt gratitude that I owe to my learned guide and supervisor “Dr Neeru
Sharma” cannot be expressed in words. Her unconquerable help, constant inspiration,
key counsel, generous nature are among the very few favour that she give upon me time
to time from the inception of this project to this day.

Nipun Aggarwal Shashi Shekhar Shukla Raaj

(141085) (141090) (141098)

(Department of Electronics and Communication Engineering)

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 CONTENTS Page
No.

List of Figures.....................................................................................……(vi)

List of Tables......................................................................................……(vii)

List of Abbreviations..........................................................................…...(vii)

Abstract...............................................................................................…..(viii)

1. Introduction…………………………………………………………….1
1.1 Problem statement ……………………………………………1
1.2 Objective of project…………………………………………...2
1.3 Organization of the project……………………………………3

2. Literature Review……………………………………………………...4
2.1 Designed & Developed A GSM Based DMD boards……….4
2.2 Development Of GSM Based Digital Notice Board…….…..4
2.3 Bluetooth based alphanumeric scrolling display system…….5
2.4 Smart Led Notice Board Using Bluetooth Device……...……5

3. Proposed Model………………………………………………………..6
3.1 Project Introduction…………………………………………..6
3.2 Block Diagram…………………………………………….…7
3.3 Hardware Requirements……………………………………...7
3.4 Software Requirements………………………………………15

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4. Working ……………………………………………………………….19
4.1 Circuit Diagram……………………………………………...19
4.2 Flow Chart…………………………………………………...21

5. Conclusion……………………………………………………………..22
5.1 Result………………………………………………………...22
5.2 Future scope………………………………………………….22
5.3 Observations…………………………………………………23

6. Appendix……………………………………………………………….25

7. References……………………………………………………………...30

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 LIST OF FIGURES

Sr. Name of Figure Page No.

No.

i. Block Diagram 7
ii. LED DMD 8
iii. HC-05 Bluetooth Module 8
iv. Atmega328p Microcontroller 9
v. IC MAX7219 9
vi. Arduino Uno 10
vii. Pin Diagram of Arduino 12
viii. Arduino (IDE) Software 16
ix. Proteus 8 Professional 18
x. Circuit Diagram 19
xi. Flow Chart 21
xii. Hardware Implementation 23
xiii. Output (Default Message) 24
xiv. Output (Message Received By Bluetooth) 24

LIST OF TABLES

Sr. Name of Figure Page No.

No.
vivii
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 i. Arduino Specification 11

Sr. LIST OF ABBREVIATIONS

no.

i. DMD - Dot matrix display

ii. LED - Light emitting diode
iii. GSM - Global system for mobile communication
iv. Wi-Fi - Wireless fidelity
v. AC - Alternating Current
vi. ISP - In system programming
vii. EEPROM - Electrically erasable programmable read-only
memory
viii. SRAM -   Static random access memory
ix. PWM - Pulse width modulation
x. USB - Universal serial bus
xi. ICSP - In-circuit serial programming
xii. IDE - Integrated development environment 
xiii. I/O - Input & Output
xiv. DC - Direct current
xv. GND - Ground
xvi. Vin - Input voltage
xvii. TX - Transmitter
xviii. RX - Receiver
xix. AREF - Analogue reference

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 ABSTRACT

The information sharing aspect of information technology is playing a prominent role

in all kinds of business either it’s non-profit organization or profit organization. Now a
days, all types of business requires and adopts the facility of advertisement to promote their
services and products. Digital advertisement is the current requirement of the modern
businesses sand information world. Scrolling led dot matrix displays are used at
international airports, stock exchanges, metro railway stations, shopping complex, bus
stations etc. led display is an effective mode on displaying information but the complicated
task is to make the message dynamic as the users have to change the massage content
according to this specific requirements. In case of changing the message content the user
have to connect the led display with the computer, so that the display board cannot be
placed any where because of dedicated and complex wiring pattern. Wireless based dot
matrix display makes the wireless connection between user mobile and led display. It
provides the facility of real time message displaying means the user can change the
message content that is to be display. A mobile is used to send the message to the led
display and the microcontroller does all processing of displaying the message content on
the led display in scrolling pattern. The aim of the project is to develop a wireless scrolling
message board that facility the user to change the message content without connecting the
display board with the computer or laptop through a cable. The user can update the message
content through Bluetooth or Wi-Fi.

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 1. INTRODUCTION

1.1 Problem statement:

Communication and the need to constantly be in touch with one another are very
vital and cannot be over stressed. Communication is a purposeful activity of exchanging
information across space and time using various technical or natural means, whichever is
available or preferred. Communication requires a sender, a message, a medium and a
recipient (Harper, 2013). Due to the present technological development, especially in the
field of communication and Wireless network, a lot of applications appeared for the
facility of our daily life needs. Such applications include using the electronic screens for
Wireless advertisements as a substitute of using normal papers fixed on advertisement
board, which is an inefficient cultural habit in addition to be against a clean environment.
As engineers we are focused to think of alternative solutions to let information be noticed
by others. Furthermore, using such methods spread information all over places such as
universities, libraries, banks, supermarkets and the like. The main purpose is to provide
the people with suitable information necessary and important in their lives. For example,
in the university, it allows the students know about the data and time of their examination,
or any other information they need as students.

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1.2 Objective of Project:

This project is based on the idea of designing a led display system for wireless
communication between mobile and led display. In this, wireless communication is done
by Wi-Fi or Bluetooth. Now a day every mobile consist of Wi-Fi and Bluetooth features.
The users having mobile hand set can send message to the display to flash or to display
message content in scrolling pattern. Bluetooth module is used to receive the message in
circuit. The message content sent by the user is stored in Bluetooth module in case, the
user can sent message by using wifi then led controller was received the message and
stored in it. The led dot matrix display consist 8*8 matrix with a distance between the
rows or pins is 10mm. a preprogrammed microcontroller is used to supply with the
standard format of character set containing character and alphabets with the possibility of
generating and displaying punctuation marks, numbers, special characters, simple
graphics. Each character is display in the pattern based on hexadecimal values that are
stored in the microcontroller that is termed as look up or match table. The microcontroller
looks or matches from pattern and sent out the data bits serially and clock signal. Shift
registers are used to shift dada between the pins connected to each led. Persistence of
vision is the based of the fast scanning of data that is set on rows and column, which
allows the pattern to be display because of persistence of vision. Decode counter is used to
control the rows on the bases of pulses that is connected to the clock input of the
microcontroller the design involves both hardware and software.

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1.3 Organization of the dissertation report:

This section shows the organization of dissertation and serves as a road map to the reader.
1. Chapter 1 in report starts with introduction of the project background which is the
analysis of Bluetooth Controlled Notice Board Using Dot Matrix. Next this report
will touch on the objective, necessity and problem definition that need to carry out
in order to complete this project. thus this chapter sketches an overview of the
report.

2. Chapter 2 contains literature review Bluetooth Controlled Notice Board Using Dot
Matrix which is helpful for us to develop our project in proteus.

3. Chapter 3 gives detail block diagram description & working of circuit diagram of
hardware system development. With this we also discuss about software system
development & algorithm used in system development step wise execution.

4. Chapter 4 describes results of the computational study. Simulation test result i.e.
result of recognized task will be display on led dot matrix display which shows the
received string via bluetooth.

5. Chapter 5 concludes the report with directions for summary and discussions.

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 2. LITERATURE REVIEW

2.1 Rahul Kamboj and Preeti Abrol (2013) designed and developed a
GSM based multiple LED display boards using AT89S52
microcontroller, GSM module.

LCD and several moving LED displays. Multiple moving LED displays were
connected via different GSM modules at different geographical locations such that the
same SMS sent was displayed on all the moving LED displays. Though with few
limitations, this work proved to be cost-effective, secured and efficient as compared to
previous works.

2.2 Gowrishankar Kasilingam, Mritha Ramalingam and Chandra Sekar

(2014) proposed development of GSM based digital notice board.

The complete system would have a dual system in terms of changing message
display, dual power supply switchable between solar power system and alternating current
(AC) from the utility supply and inbuilt motion detector that could automatically switch
OFF the whole system after working hours and would automatically switch ON if any
motion sensed by the motion detector after the programmed working hours. This work
would probably prove highly efficient in terms of ensuring better communication and
continuous power supply.

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2.3 Raj Hakani (2014) worked on Bluetooth based alphanumeric
scrolling display system.

In this paper, Raj Hakani (2014) worked on Bluetooth based alphanumeric

scrolling display system using PIC16F877A microcontroller interface with HC05
bluetooth model. Hardware also include DS1307 real time clock, alphanumeric panel and
multiple DMD displays and microcontroller coding was done using Embedded C and
MpLab. In this research, multiple users were authorized to update notices on the digital
notice board. This design can only maximum of 60 characters on the board.

2.4 Arumugam K “smart led notice board using bluetooth device.”

Small innovative steps in making use of technology for regular purposes would have an
adverse effect on the environment issues which we are presently concerned about. The main aim
of this paper is to design a SMS driven automatic display Board which can replace the currently
used programmable electronic display and conventional notice boards. It is proposed to design to
receive message in display toolkit which can be used from an authorized mobile phone. The whole
process can be described from the transmitter and receiver section. The Bluetooth module receives
a message from the authorized mobile phone and the message is extracted by the microcontroller
from the bluetooth module and is displayed on the matrix display board. Serial to parallel
communication is used for the entire process from WIFI module to Microcontroller and from
microcontroller to the matrix display. And for the acknowledgement LED display is used. The
proposed system in this paper has many upcoming applications in educational institutions and
organizations, crime prevention, traffic management, railways, advertisements etc. Been user
friendly, long range and faster means of conveying information are major bolsters for this
application. By using this proposed methodology we can enhance the security system and also
make awareness of the emergency situations and avoid many dangers.
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 3. PROPOSED MODEL

3.1 Introduction:

Traditionally notice board is all about sticking information, but sticking various
notices day to day is a difficult process and consumes more time. To overcome this problem
here is a project deals with and innovative wireless notice board using bluetooth. The
system is comprised of both software and hardware. Software area includes the Bluetooth
android application development and code algorithm for microcontroller to receive and
display a notice on graphical dot matrix display. In this project, we used Arduino IDE
software for coding and Proteus 8 professional software for simulation. The hardware area
includes the development of receiver hardware using Atmega328P microcontroller are its
configuration of both module. The development system reflects the minimum requirement
to realize wireless notice board. This digital notice board project is design to develop a
mobile controlled scrolling message display for notice board. This scrolling display made up
off matrix LEDs. Android mobile can be used to change the display on the notice board. In
this project we are using Bluetooth technology to excess the display. Whenever used to turn
power supply then the system display default message on the LED display. Whenever user
needs to change the message on the notice board, the user had to type a message on an
application installed on an android mobile and send it to the microcontroller using Bluetooth
technology.

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3.2 Block Diagram:

Figure 3.2: Block Diagram

3.3 Hardware Requirements:

3.3.1 LED DOT MATRIX Display:

A LED matrix or LED display is a large, low-resolution form of dot-matrix display,

useful both for industrial and commercial information displays as well as for hobbyist
human–machine interfaces. It consists of a 2-D diode matrix with their cathodes joined in
rows and their anodes joined in columns (or vice versa). By controlling the flow of
electricity through each row and column pair it is possible to control each LED individually.
By multiplexing, scanning across rows, quickly flashing the LEDs on and off, it is possible
to create characters or pictures to display information to the user.[4] By varying the pulse
rate per LED, the display can approximate levels of brightness. Multi-colored LEDs or
RGB-colored LEDs permit use as a full-color image display. The refresh rate is typically
fast enough to prevent the human eye from detecting the flicker.

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 Figure 3.3.1: LED DMD

3.3.2 HC-05 Bluetooth Module:

HC-05 module is an easy to use Bluetooth SPP (Serial Port Protocol) module,
designed for transparent wireless serial connection setup. Serial port Bluetooth module is
fully qualified Bluetooth V2.0+EDR (Enhanced Data Rate) 3Mbps Modulation with
complete 2.4GHz radio transceiver and baseband. It uses CSR Bluecore 04-External single
chip Bluetooth system with CMOS technology and with AFH(Adaptive Frequency Hopping
Feature). It has the footprint as small as 12.7mmx27mm. Hope it will simplify your overall
design/development cycle.

Figure 3.3.2: HC-05 Bluetooth module

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3.3.3 Atmega 328 Microcontroller:

The Atmega 32 bit microcontroller combines 32 kilobyte ISP flash memory with
read and write capabilities, 1 kilobyte EEPROM, 2 kilobyte SRAM, 23 general purpose
input output lines, 32 general purpose working registers, 3 flexible timer/counters with
compare modes, internal and external interrupts.

Figure 3.3.3: Microcontroller ATmega328p

3.3.4 IC MAX7219

The MAX7219 is an IC designed to control a 8x8 LED MATRIX. The IC is serial

input common-cathode (Common Negative) display drivers that interface microprocessors
(or microcontroller) to 7-segment numeric LED displays of up to 8 digits, bar-graph
displays, or 64 individual LEDs.

Figure 3.3.4: IC MAX7219

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3.3.5 Arduino Uno:

The Arduino Uno is a microcontroller board based on the ATmega328P. It has 14

digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs a 16
MHz quartz crystal, a USB connection, a power jack, an ICSP header and a reset button. It
contains everything needed to support the microcontroller. “Uno” means one in Italian and
was chosen to mark the release of Arduino Software (IDE) 1.0.

The Uno board and version 1.0 of Arduino Software (IDE) were the reference
version of Arduino, now evolved to newer releases. This board is the first in a series of USB
Arduino boards.

Figure 3.3.5: Arduino Uno

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Microcontroller ATmega328P
Operating Voltage 5V

Input Voltage 7-12V

Input Voltage (limit) 6-20V
Digital I/O Pins 14
PWM Digital I/O Pins 6
Analog Input Pins 6
DC Current for
Dc Current per3.3V
I/O pin
pin 20mA
50mA
Flash Memory 32 KB (ATmega328P)

SRAM 2 KB (ATmega328P)
EEPROM 1KB (ATmega328P)
Clock Speed 16 MHz
Length 68.6 mm
Width 53.4 mm

Table 1: Technical specifications

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3.3.6 Pin Diagram:

Figure 3.3.6: Pin Diagram of Arduino Uno

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Power USB
Arduino board is high-powered by victimisation the USB cable from your laptop. All
you would like to try to to is connect the USB cable to the USB affiliation (1).

Power (Barrel Jack)

Arduino boards are often directly high-powered from the AC mains power provide by
connecting it to the Barrel Jack (2).

Voltage Regulator
The main perform of transformer is to regulate the voltage given to the UNO board
and stabilize the DC volt utilized by the processor and alternative parts.

Crystal Oscillator
Crystal oscillator helps Arduino board in handling time problems. however will
Arduino calculate time? the solution is, by victimisation the quartz oscillator. the
amount written on high of the Arduino crystal is sixteen.000H9H. It tells North
American nation that the frequency is 16,000,000 Hertz or sixteen Mega Hertz.

Arduino Reset
You can reset your Arduino board, i.e., starts your program from the start. you'll reset
the UNO board in 2 ways in which. First, by exploitation the push button (17) on the
board.

Pins (3.3, 5, GND, Vin)

 3.3V (6) − Supply 3.3 output volt

 5V (7) − Supply 5 output volt

 Most of the components used with Arduino board works fine with 3.3 volt and
5 volt.

 GND (8)(Ground) − There are several GND pins on the Arduino, any of which
can be used to ground your circuit.

 Vin (9) − This pin also can be used to power the Arduino board from an
external power source, like AC mains power supply.

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Analog pins
The Arduino UNO board has five analog input pins A0 through A5. These pins will
scan the signal from AN analog device just like the gas device or humidness device
and convert it into a digital price that may be scan by the silicon chip.

Main microcontroller
Each Arduino board has its own microcontroller (11). you'll be able to assume it
because the brain of your board. the most IC on the Arduino is slightly totally different
from board to board.. you need to recognize what IC your board has before loading up
a replacement program from the Arduino IDE.. For a lot of details concerning the IC
construction and functions, you'll be able to confer with the information sheet.

ICSP pin
Mostly, ICSP (12) is associate degree AVR, a small programming header for the
Arduino consisting of MOSI, MISO, SCK, RESET, VCC, and GND. it's typically
mentioned as associate degree SPI (Serial Peripheral Interface), that may well be
thought-about as associate degree "expansion" of the output. Actually, you're slaving
the output device to the master of the SPI bus.

Power LED indicator

This diode activates once you plug your Arduino into an influence supply to indicating
that your board is obtaining power properly. If this light-weight doesn't activate, then
there's one thing wrong within the hardware association.

TX and RX LEDs
On your board, you'll notice 2 labels: TX-(Transmit) and RX-(receive). they seem in 2
places on the Arduino UNO board. 1st at the digital pins zero and one, to point the
pins accountable for serial communication. Second, the Transmit and receive junction
rectifier (13). The Transmit junction rectifier flashes with completely different speed
whereas causing the serial knowledge.

Digital I/O
The Arduino UNO board has fourteen digital Input-output pins (15) (of that six give
PWM (Pulse dimension Modulation) output. These pins will be organized to figure as
input digital pins to browse logic values (0 or 1) or as digital output pins to drive
completely different modules like LEDs, relays, etc.

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 AREF
AREF stands for Analog Reference. it's typically, wont to set Associate in Nursing
external reference voltage between zero and five Volts because the higher limit for the
analog input pins.

3.4 Software Requirements:

3.4.1 Arduino Integrated Development Environment (IDE):

The Arduino Integrated progress Environment - or Arduino Software (IDE) - It

includes a text editor to write a program, a message field, a text area, a toolbar which has
buttons for a common method and a series of menus. It connects with the Arduino and
Genuino hardware to load the program and establish communication with them. These
sketches are to be written in the text editor and are saved with the extension .ino.

The editor has characteristics for cutting/pasting and for searching/replacing text.
The message area gives information while saving and also show errors. The console shows
text output by the Arduino Software (IDE), which includes complete error messages and
other information. The lowermost right-hand corner of the window shows the configured
board and serial port. The toolbar buttons allow you to validate and upload programs, create,
open, and save sketches, and open the serial monitor.

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 Figure 3.4.1: Arduino (IDE)

3.4.2 Proteus 8 Professional:

Proteus 8 Professional is software which can be used to draw schematics, PCB

layout, code and even simulate the schematic. You can simulate your work and be more
efficient in completing the task at hand.

Drawing the schematic is very easy using Proteus. You can click the "Pick
devices" button and select the desired component. You can draw wires by clicking on the
terminal of the component or Vcc, Ground, etc.

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 Many of the components in Proteus can be simulated. There are two options for
simulating: Run simulator and advance frame by frame. The "Run simulator" option
simulates the circuit in a normal speed (If the circuit is not heavy). "Advance frame by
frame" option advances to next frame and waits till you click this button for the next time.

This can be useful for debugging digital circuits.

You can also simulate microcontrollers. The microcontrollers which can be simulated
include PIC24, dsPIC33, 8051, Arduino, ARM7 based microcontrollers. You can
download the compilers for Proteus or use different compiler and dump the hex files in the
microcontroller in Proteus. You can even interact in real-time with the simulation using
switches, resistors, LDRs, etc. There are even virtual voltmeter, ammeter, oscilloscope,
logic analyzer, etc.

You can make your own design or let Proteus do that for you. Making your own
design is simple, you just have to place the components used in the schematic and draw
traces over them. Don't worry about violating any design rules because it automatically
detects design rule (DRC) errors. You can also let Proteus do the work for you. 

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Figure 3.4.2: Proteus 8 Professional

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 4. WORKING

4.1 Circuit Diagram:

Figure 4.1: Circuit Diagram

Establish between connectivity between android application and the Bluetooth

module. The user will send message that will be received by the Bluetooth module, and the
Bluetooth module communicate with microcontroller using serial communication port rx, tx
with baud rate 9600. This message is stored in the arduino which is later used to display the
message on the dot matrix led display. Message Display on LED Matrix process. Figure
LED Matrix 8*32 According to the figure three shift registers are used (one shift register
for each 8X8 block of LED set) for the input signal of LED column, the decade counter is
used for the row of dmd input signal control.

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 The eight display matrix row, the output of the atmega328p, that is controlling 4017
decade counter as well as 74HC595 shift register for column. A current limiting register is
connected with each LED of the column. The shift register can allow current up to 8ma.
The 0 and 1 are in binary code is used for blinking the LEDs in the sequence to display
character. Microcontroller use ASCII code for character to be display stored in the internal
memory that matches the pattern in character generation. Controller send the code in series
of display pattern to the shift register. Any bit pattern that is ‘1’ means turn on the LED,
and any bit pattern that is ‘0’ means off LED. The clock transfer of serial data into shift
register is done by the controller and the process is repeated for first line of other matrix
display column segment now decade counter first pin controls the first row of the matrix in
dmd. All high LED display the character pattern. This process is repeated for all rows and
columns. The 16 bit display buffers are used for scrolling effect in 4 display matrix and the
message scroll from right to left direction.

The system is a Microcontroller based SMS box. The main components of the kit
includes Microcontroller, GSM modem and Bluetooth device. These components are
integrated with the display board and thus incorporate the wireless features. The GSM
modem receives the SMS which are in turn passed to the microcontroller via a Bluetooth
connecting device. The AT commands are serially transferred to the modem through
MAX232. In return the modem transmits the stored message through the COM port. The
microcontroller validates the SMS and then displays the message in the LED display board.
Various time division multiplexing techniques have been suggested to make the display
boards function efficiently. In this prototype model, LED display is used for APP purpose.
During the process of implementation this can be replaced by actual display boards. In
addition to address matching, data can be received only by the dedicated receiver, and this
data is displayed on LED. It displays the same message until it receives another verified
message.

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4.2 Flowchart:

Figure 4.2: Flow Chart

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 5. CONCLUSION

5.1 Result:

With the completion of this project, Figures 5.3.2, & 5.3.3, the display is able to
properly display the intended voice recognition and automatically scrolling them through
the LED-dot matrix display. The LED dot matrix display is very versatile display and a
robust device that had been around through this vast spreading technology world, and yet
the way it has been use does not change a lot. Usually the display is being program through
wired data transfer. Many of them produce the display with different kind of software to
run them, while not all of them are working with one another. The usage of this project
would standardize the way it being reprogrammed.

This project would eliminate the need to even physically touch the display that is
probably placed on a higher place. The app was able to reprogram the display from afar
through its Bluetooth connection. The objective is to integrate an android application that
able to access the Bluetooth capabilities in the phone was a success the app is able to turn
on the Bluetooth present on the phone and initiate the connection with other Bluetooth. The
app had successfully control the Arduino through the RX/TX modulation thus being able to
reprogram the display.

5.2 Future Scope:

This project would eliminate the need to even physically touch the display that is
probably placed on a higher place. The app was able to reprogram the display from afar
through its Bluetooth connection. The objective is to integrate an android application that
able to access the Bluetooth capabilities in the phone was a success the app is able to turn
on the Bluetooth present on the phone and initiate the connection with other Bluetooth. The
app had successfully control the Arduino through the RX/TX modulation thus being able to
reprogram the display.

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5.3 Observations:

Fig 5.3.1. Hardware Implementation

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 Fig 5.3.2. Default message

Fig 5.3.3. Message received by bluetooth

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 6. APPENDIX

(A) Code for Arduino Board:

#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <SPI.h>

// set to 1 if we are implementing the user interface pot, switch, etc

#define USE_UI_CONTROL 0

#if USE_UI_CONTROL
#include <MD_UISwitch.h>
#endif

// Turn on debug statements to the serial output

#define DEBUG 0

#if DEBUG
#define PRINT(s, x) { Serial.print(F(s)); Serial.print(x); }
#define PRINTS(x) Serial.print(F(x))
#define PRINTX(x) Serial.println(x, HEX)
#else
#define PRINT(s, x)
#define PRINTS(x)
#define PRINTX(x)
#endif

// Define the number of devices we have in the chain and the hardware interface
// NOTE: These pin numbers will probably not work with your hardware and may
// need to be adapted
#define HARDWARE_TYPE MD_MAX72XX::PAROLA_HW
#define MAX_DEVICES 8

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#define CLK_PIN 13
#define DATA_PIN 11
#define CS_PIN 10

// HARDWARE SPI
MD_Parola P = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);
// SOFTWARE SPI
//MD_Parola P = MD_Parola(HARDWARE_TYPE, DATA_PIN, CLK_PIN, CS_PIN,
MAX_DEVICES);

// Scrolling parameters
#if USE_UI_CONTROL
//const uint8_t SPEED_IN = A5;
const uint8_t DIRECTION_SET = 8; // change the effect
const uint8_t INVERT_SET = 9; // change the invert

const uint8_t SPEED_DEADBAND = 10;

#endif // USE_UI_CONTROL

uint8_t scrollSpeed = 150; // default frame delay value

textEffect_t scrollEffect = PA_SCROLL_LEFT;
textPosition_t scrollAlign = PA_LEFT;
uint16_t scrollPause = 200; // in milliseconds

// Global message buffers shared by Serial and Scrolling functions

#define BUF_SIZE 200
char curMessage[BUF_SIZE] = { "" };
char newMessage[BUF_SIZE] = { "Hello! Enter new message?" };
bool newMessageAvailable = true;

#if USE_UI_CONTROL

MD_UISwitch_Digital uiDirection(DIRECTION_SET);
MD_UISwitch_Digital uiInvert(INVERT_SET);

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void doUI(void)
{
// set the speed if it has changed
{
int16_t speed = map(analogRead(SPEED_IN), 0, 1023, 10, 150);

if ((speed >= ((int16_t)P.getSpeed() + SPEED_DEADBAND)) ||

(speed <= ((int16_t)P.getSpeed() - SPEED_DEADBAND)))
{
P.setSpeed(speed);
scrollSpeed = speed;
PRINT("\nChanged speed to ", P.getSpeed());
}
}

if (uiDirection.read() == MD_UISwitch::KEY_PRESS) // SCROLL DIRECTION

{
PRINTS("\nChanging scroll direction");
scrollEffect = (scrollEffect == PA_SCROLL_LEFT ? PA_SCROLL_RIGHT :
PA_SCROLL_LEFT);
P.setTextEffect(scrollEffect, scrollEffect);
P.displayClear();
P.displayReset();
}

if (uiInvert.read() == MD_UISwitch::KEY_PRESS) // INVERT MODE

{
PRINTS("\nChanging invert mode");
P.setInvert(!P.getInvert());
}
}
#endif // USE_UI_CONTROL

27
void readSerial(void)
{
static char *cp = newMessage;

while (Serial.available())
{
*cp = (char)Serial.read();
if ((*cp == '\n') || (cp - newMessage >= BUF_SIZE-2)) // end of message character or full
buffer
{
*cp = '\0'; // end the string
// restart the index for next filling spree and flag we have a message waiting
cp = newMessage;
newMessageAvailable = true;
}
else // move char pointer to next position
cp++;
}
}

void setup()
{
Serial.begin(9600);
Serial.print("\n[Parola Scrolling Display]\nType a message for the scrolling display\nEnd
message line with a newline");

#if USE_UI_CONTROL
uiDirection.begin();
uiInvert.begin();
pinMode(SPEED_IN, INPUT);

doUI();
#endif // USE_UI_CONTROL

28
 P.begin();
P.displayText(curMessage, scrollAlign, scrollSpeed, scrollPause, scrollEffect, scrollEffect);
}

void loop()
{
#if USE_UI_CONTROL
doUI();
#endif // USE_UI_CONTROL

if (P.displayAnimate())
{
if (newMessageAvailable)
{
strcpy(curMessage, newMessage);
newMessageAvailable = false;
}
P.displayReset();
}
readSerial();
}

29
 7. REFERENCES

[1] Priyanka. M, Bavithra, N and Ramya, R. (2018). Wireless E-Notice Board Using Bluetooth
Technology ; UG Scholar Dept. of ECE, K.S.K Engineering College Kumbakonam,
Tamilnadu ,India ,(ISSN: 2278-0181), International Journal of Engineering Research and
Technology (IJERT) www.ijert.org

[2] Xuefeng BAI, Hanqing LI, (2015). The Design of LED Display Based on Solar Energy;
(DOI: 10.1051/matecconf20153108001), Beijing Information Science and Technology
University, Beijing, China, Mechanical and Electrical training Centre School of
Automation. MATEC Web of Conferences 31,08001(2015) www.ioserjen.org

[3] Modi Tejal Prakash, kureshi Noshin Ayaz, Ostwal Pratikshas Sumtilal (2017). Digital
Notice Board; SNJB’S. Katabatic Bhavarlalji Jain College of Engineering, Chandwad, Dist.
Nashik, India. International Journal of Engineering Development and Research
(IJEDR1702022), 2017 IJEDR/Volume 5, Issue 2/ ISSN:2321-9931 www.ijedr.org

[4] Farooquie Aliya, Sakhre Ashwarya Bomade Balaji Badole Madhavi, Ughade Ashvini, Prof.
Shyam D. Bawanker (Vol. 09, Issue 5 May 2019), PP 52-56. Design and Implementation of
wireless Notice Board Display on Arduino and Bluetooth Technology, Dept. of Electronics
Engineering, D College of Engineering and Management, Nagpur, India. ISOR Journal of
Engineering( IOSRJEN)

[5] Dabhare Tejas, Harne Gaurav, Bokade Akash, Matre Shubham (Vol. 04 Issue 06 2017).
Digital Wireless Notice Board.BE Dept. of Electronic and Telecommunication, PJLCE,
Nagpur, Maharashtra, India. International Research Journal of Engineering and
Technology(IRJET) www.irjet.net

[6] Meenachi. A, Kowsalya S, and Kumar. P, pp.14-20, 2016 .wireless e-notice board using
Wi-Fi and Bluetooth technology, vol 6 no 4 Journal of Network Communication and
Engineering Technology (JNCET).

30
[7] Mujumdar Anuradha, Niranjane Vaishali and Sagne Deepika, (2014) (pp.475-478).
Scrolling LED display using Wireless transmission, International Journal of Engineering
Development and Research (ISSN: 2321-9939), Volume 2, Issue 1.

[8] Kasilingan0. Gowrishankar, Ramlingam Mritha and Sekar Chandra (2014) .A Survey of
light Emitting Diode (LED) Display Board Indian Journal of Science and Technology,
vol.7(2), 185- 188, February 2014.

[9] Garg Vijay Kumar, Ewilkes Joseph, (pp177-192, 1999). Principle and Application of GSM
Upper Saddle River, NJ Prentice Hall PTR.

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