This document describes a portable Bluetooth-enabled scrolling LED matrix display created by students under the guidance of K. Shailaja Madam. The display uses an Arduino Uno to control four 8x8 LED matrices and receive text messages over Bluetooth from an Android phone app. The text is sent from the phone and scrolls across the LED matrices from right to left. The document outlines the components used, including the Bluetooth module, Arduino, LED matrices, and shift registers. It provides the block diagram, circuit diagram, and explains how the display works and its potential applications in schools, businesses, and transportation.

1. DEPARTMENT OF ELECTRICAL& ELECTRONIC ENGINEERING
PORTABLE BLUETOOTH ENABLE SCROLLING LED MATRIX DISPLAY
UNDER THE GUIDENCE OF: Presented by:
K . SHAILAJA MADAM 20C35A02217- CH.SRAVANTHI
20C35A0220- D.KISHOR KUMAR
20C35A0224- G.VAMSHI
20C35A0256- R.RAJINI
20C35A0272- E.KEERTHANA
BALAJI INSTITUTE OF TECHNOLOGY & SCIENCE
Narsampet, Warangal - 506331, Telangana, India
(AUTONOMOUS)
Accredited with NAAC A+ Grade, Accredited by NBA ( EEE,CE,ME,ECE,CSE)
(Affiliated, to JNTUH, Hyderabad and Approved by the AICTE, New Delhi)

2. Abstract
Introduction
Block diagram
Components
 Bluetooth SPP Pro app
 Arduino UNO
 Light Emitting Diode (MAX7219)
 Shift Register
 Hardware Design
 Circuit Diagram
 Working
 Advantages
 Applications
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3.  The display all kinds of information , including text, graphics and animation.
 This project is about to making a portable Bluetooth Controlled 4 Monochromatic
LED matrix(8*8) for displaying scrolling text messages.
 We made this display to use at head of department cabin for displaying name by
Mr. S. Mallikarjun Reddy.
 The text data to be displayed can be send from a smartphone using the Bluetooth
connection
 The display is Arduino controlled and we uses the Bluetooth SPP pro app on my
android
phone for sending text message to the matrix display(Max7219).
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ABSTRACT

4. INTRODUCTION
 In this world of information, fluent transfer of information is important.
Starting from receiving data to displacing data, the electronic devices
has played significant role.
 In this project Arduino is used as a controlled to command the Light
Emitting Diode (LED). the Arduino UNO used.
 The information regarding the display content is send to LED display
through HC-05 Bluetooth of Android phone.
 The information displayed will scroll from right to left over and over
again.
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5. 5
BLOCK DIAGRAM

6. COMPONENTS
1) Bluetooth SPP PRO APP:
 The Bluetooth SPP PRO APP and its settings to need the requirements of this
project. It is a Bluetooth client communication tool developed by JERRY.LI for
android platform.
 It allows to transfer data from your smart phone to the HC-05 Module in ASCII or
HEX format.
 Ones connected to the HC-05 module , the main menu shows The Three data
transfer options namely
byte stream
key-board
command line mode
 Command line mode displays the text in LED matrix display.
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7. 2) ARDUINO UNO:
 Arduino is a open source electronics community.
 We developed an Arduino sketch for scrolling text display.
 The Arduino firmware is also capable of receiving user command for
controlling the scrolling speed and brightness level of the display.
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8. 3) LED:
 LED ( LIGHT EMTTING DIODE) is an electronic display module
 Each module consists of an monochromatic LED DOT MATRIX with
an board MAX7219 driver chip
 16 Brightness levels controlled through software
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9. 4) 74HC595 SHIFT REGISTER:
 An 8bit shift register with series to parallel capability
 We use two of them, each one controlling Eight Rows/
Columns
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10. CIRCUIT DIAGRAM:
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12. WORKING:
Initially power supply fed to the ARDUINO through
9volts adaptor
5volt supply is fed to the LED MAX7219 and also to
the HC-05 Bluetooth
The executed program code is dumped in Arduino
to HC-05 Bluetooth for pairing with smartphone
The required text is entered in the smartphone that
will be displayed on the LED display through
Arduino
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13. ADVANTAGES:
 Message can be displayed on display with a single press
 Low power consumption
 User friendly interface
 Efficient design
 No message charges as compared with GSM
 Reduces the use of paper for information sharing.
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14. APPLICATIONS:
 This technology can be used in:
 schools
 colleges
 Banks
 Government offices
 MNC
 Railways etc.
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15. Future scope:
FUTURE SCOPE Multiple receiver MODEMS at the different positions in a
geographical area carrying duplicate (cloned) SIM Cards.
Multilingual display
Graphical Display
Use of MMS technology
In future every text wiil be displayed in digital format, for that it plays a
major role.
Ex: Metro stations
Arways

16. THANK YOU