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Report on lifi technology for students
Electronic and communication (ECE)
Visvesvaraya Technological University
Comments
- Sorry!, may I get your email?
- what if the the light signal meet an obstacle, and then obstacle removed. will it retransmit all data? or it does not know any condition of the receiver?
- thanks
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ABSTRACT
Light Fidelity (Li-Fi) is a new technology which focuses on communication by utilizing the visible light spectrum. Li-Fi basically uses already available light sources like LED to transmit data, by blinking the LED. These changes in the intensity of light are detected by a photodetector device which receives the data. Thus, illumination and communication are achieved simultaneously. This paper presents a way for Serial and Parallel Communication of data though Li-Fi. The text is transmitted serially by using a single LED and phototransistor. For parallel transmission, the number of LED and phototransistor is increased. White LED for transmission of the text. At the receiver side, a phototransistor which is sensitive to visible light is used along with Arduino Uno, photo diode to complete the reception of the text. Li-Fi offers a completely new method of communication, which has a potential to increase the speed of communication drastically. This project report focuses on Li-Fi, its applications, features and comparison with existing technologies like Wi-Fi etc. Wi-Fi is of major use for general wireless coverage within building, whereas Li-Fi is ideal for high density wireless data coverage in confined area and especially useful for applications in areas where radio interference issues are of concern, so the two technologies can be considered complimentary. Li-Fi provides better bandwidth, efficiency, connectivity and security than Wi-Fi and has already achieved high speeds larger than 1 Gbps under the laboratory conditions. By leveraging the low-cost nature of LEDs and lighting units, there are lots of opportunities to exploit this medium.
CONTENTS
LIST OF FIGURES
1 STATEMENTS OF PROBLEMS
The main drawback of Li-Fi is that light-weight cannot tolerate the objects, consequently if the receiver is unknowingly blocked in any manner, then the signal can straight
off or shot cut out. So as a result the communication breaks out.
1 METHODOLOGY
The logic behind the working of light fidelity technology is much unmingled. If the LED is on, a digital string ‘1′ is transmitted and when the LED is off then a digital string ‘0′ is transmitted. For example, there is a LED at one end and a photo detector at the other end, whenever the LED is on, a binary ‘1′ and when the LED is off a binary ‘0′ is registered by the photo detector. Thus a message is build up by many flashes of LED. Many other highly developed technologies can be used I increasing the data rate of VLC, a recent research in Berlin attained rates of 500 megabytes per second. Parallel data transmission where each LED generates a separate data stream
1 OBJECTIVES OF THE PROJECT
The prime objective of the project is to create an application that transmits data be it text, using Li-Fi technology for coping with the limited bandwidth problem we face in RF (Radio frequency) signals.
For better, efficient, secure and a faster connection Li-Fi is used.
1 LITERATURE SURVEY
Are using this Li-Fi technology in 2011. The Li-Fi is a wireless communication system in which light is used as a carrier signal instead of traditional radio frequency as in Wi-Fi [18, 20]. ATM transaction and notice the Giga spot sign for instant digital movie downloads. Use some payment facility data to download high speed movie within a few seconds and Giga Link flash drive plugged into the USB port of our smart phone. As we walk away, our phone is alert us that the leather jacket featured in the character of movie is on sale nearly. We walk over towards the show window and our image comes up on the screen.
1 ORGANIZATION OF REPORT
CHAPTER – 2
OVERVIEW OF THE PROJECT
LI-FI stands for “Light Fidelity”. The technology uses an LED light bulb that varies in intensity faster than the human eye can follow to send data through illumination. The light that zips data across the Internet’s backbone used to stop a long way from the data’s final destination but now it goes all the way to our homes. The LI-FI technology takes the last step and takes the light all the way to the computer or TV, projecting it through the air over the last few meters and only converting it to an electronic signal at the end. Since LI-FI uses visible light instead of radio waves as the medium of communication, LI-FI is considered as the optical version of WI-FI. LI-FI is an important component of the Internet of Things (IoT), in which everything is connected to the internet. LED lights are used as access points in case of IoTs. Such indoor optical wireless probably wouldn’t replace Wi-Fi,
2 DETAILED DESCRIPTION
2.2 PIN DIAGRAM AND WORKING EXPLAINATION (ACTUAL
CONNECTION)
CHAPTER – 3
HARDWARE REQUIREMENTS
3 HARDWARE REQUIREMENTS
3.1 controller: Arduino is an open-source physical computing platform based on a simple input/output board a development environment that implement the processing/ wiring language.
▪ The name of micro controller is Atmega328. ▪ The input to the micro controller is from 7 volt to 12 volt. ▪ It has 24 input output ports. Where, 14 pins are digital input output ports of them are analog input output ports. ▪ Micro controller has in build pulse width modulation o/p (6 PWM outputs). ▪ Arduino has 32k bytes of flash memory. ▪ It uses 16 MHz of crystal. ▪ Arduino also supplies 5 volts and 3. volts at 500ma. ▪ It has a reset button and reference signal.
TRANSMITTER PROGRAMMING
#include <SoftwareSerial>
#include <LiquidCrystal>
#include <Keypad>
LiquidCrystal lcd(4,5,6,7,8,9);
const byte ROWS = 4;
const byte COLS = 4;
char hexaKeys[ROWS][COLS] = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};
byte rowPins[ROWS] = {11,12,A0,A1};
byte colPins[COLS] = {A2,A3,A4,A5};
SoftwareSerial GSerial(2,3);
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);
char keycount=0;
char code[5];
void setup() {
delay(1000);
Serial(9600);
Serial("Keyboard Test:");
GSerial(400);
lcd(16, 2);
// Print a message to the LCD.
lcd(0, 0);
lcd(" LiFi - Wireless");
lcd(0, 1);
lcd(" Communication ");
lcd(0, 1);
lcd(" ");
lcd(0, 1);
}
else if (customKey == '*')
{
GSerial('&');
lcd();
}
else
{
// otherwise, just print all normal characters
Serial(customKey);
GSerial(customKey);
lcd(customKey);
}
}
}
RECEIVER PROGRAMMING
#include <SoftwareSerial>
#include <LiquidCrystal>
LiquidCrystal lcd(4, 5, 6, 7, 8, 9);
SoftwareSerial GSerial(11,12);
char rec=0;
void setup()
{
if(GSerial() != 0)
{
rec = GSerial();
if(rec=='^')
{
lcd(0, 1);
lcd(" ");
lcd(0, 1);
}
else if(rec=='&')
{
lcd();
}
else
{
Serial(rec);
lcd(rec);
}
}
}
CHAPTER – 4
SOFTWARE REQUIREMENTS AND FLOWCHART
4 SOFTWARE REQUIREMENTS
4.1 Software requirements :
The Main Event: Arduino Uno
The Arduino Uno is the “stock” Arduino. It’s what we compare every, other, Arduino- compatible board to. If you’re just getting into Arduino, this is the board,The Uno comes in two flavors, through-hole and SMD, which use either a through- hole or surface mount ATmega328. The through-hole version (pictured above) is nice because you can take the chip out and swap in a new one (in case the magic, blue smoke is released), but the SMD version has the potential to be more readily available (PTH chips are increasingly being phased out of existence). The Arduino Uno can be powered through either the USB interface, or an external barrel jack. To connect it to a computer you’ll need a type-B-to-A USB cable (like the USB connector on most printers).. The Arduino Integrated Development Environment (IDE) is a cross- platform application (for Windows, macOS, Linux) that is written in functions from C and C++. It is used to write and upload programs to Arduino compatible boards, but also, with the help of 3rd party cores, other vendor development boards.
The source code for the IDE is released under the GNU General Public License, version The Arduino IDE supports the languages C and C++ using special rules of code structuring. The Arduino IDE supplies a software library from the Wiring project, which provides many common input and output procedures. User-written code only requires two basic functions, for starting the sketch and the main program loop, that are compiled and linked with a program stub main() into an executable cyclic executive program with the GNU toolchain, also included with the IDE distribution. The Arduino IDE employs the program Arduino to convert the executable code into a text file in hexadecimal encoding that is loaded into the Arduino board by a loader program in the board's firmware. By default, Arduino is used as the uploading tool to flash the user code onto official Arduino boards.
Report on lifi technology for students
Course: Electronic and communication (ECE)
University: Visvesvaraya Technological University
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