International Journal of Engineering Trends and Technology (IJETT) – Volume 46 Number 3 April 2017

ISSN: 2231-5381 http://www.ijettjournal.org Page 143

PC to PC File Transfer using Li-Fi Technology Shaik.Shakeera#1, P. Sai Manideep#2, M.Shahin Begum#3,V.V.Bhargav#4, P.D.N.Malleswara Rao#5

#1Assistant Professor, ECE Department, VR Siddhartha Engineering College. #2,3,4,5B.Tech, ECE Department, VR Siddhartha Engineering College.

ABSTRACT: This System has regulated the speed which human eye has not be perceived its blinking. At receiver by applying photosensitive detector, transmitted data can be received. This system can be demonstrated as bidirectional VLC system where both computers can act as transceiver. Using a processing software, Arduino software and Arduino hardware the transmission of files occurs between two computers where LED and LDR were in the same line of sight. It is observed that the system has worked better for white LED than the red LED and IR LED. So, VLC based text and file transfer system is implemented with white LED. Keywords— Arduino; processing; Arduino software; LED; LDR; visible light communication; file transfer; INTRODUCTION:

In this era of wireless technology, wireless data rates and the number of devices accessing the Internet increased exponentially in the last decade. According to recent forecasts, by 2015 more than 6 wireless data network would be required per month, this has unfortunately led to an increase in network complexity, inadequate wireless radio frequency bands and increased risk of radio frequency interference. So, Li-Fi is the solution to this problem for radio frequency crisis. Instead of using Internet for the file transfer, a more flexible and very fastest mode of communication, Li-Fi can be used.[1] Li-Fi requires Line of Sight for communication. It is nearly 100 times faster than Wi-Fi. Recent experiments on Li-Fi shows the speed in the order of GBPS. The areas where the radio waves are restricted or causing harm, they can be replaced by Light waves which are not at all harmful and have unlimited bandwidth compared to the Wi-Fi.[2] They canbe used in home automation, file transfer, monitoring the activities, Li-Fi hotspots, vehicular communication and ship to ship communication etc. In the next section, the requirements for the file transfer and its working is described. In 3rd section, the working of the system is described in detail. In 4th section the results and observations by using this system is shown pictorially. In 5th section the conclusion on this project is described. In the 6th section the future scope is described BLOCK DIAGRAM:

Fig. 1: Block Diagram

Processing software: This is used as the front end software, used to

instruct the Arduino. Coding is written in the java language. The file present in the PC is read using this software and converted to the binary form and is sent to the Arduino via Serial port. Arduino software:

This software has its own syntaxes and formats used to blink the LED connected to one of its digital pins The code written in the Arduino software is compiled and uploaded to the Arduino using the serial port via cable. This cable connected to the PC also supplies power to the Arduino. Arduino UNO:

There are four classes of Arduino but in this system Arduino UNO is used. This Arduino UNO is enough for the file transfer from one PC to another PC. This Arduino class has 13 digital pins, 5 analog pins and power supplies such as 5volts and 3.3 volts. The LED is connected to one of the digital pins. TheArduino works according to the program dumped into the Arduino. The LED blinks according to the binary logic sent from the processing software. LED:

The logic sent by the processing is received by the Arduino. The LED is connected to the one of the digital pins of the Arduino and the corresponding TTL logic is obtained by the digital pins. The LED blinks according to the logic. LDR:

The Light Dependent Resistor offers infinite resistance in the darkness and offers very few ohms when there is light. The light from the LED is detected by using LDR and the data is sent to the Arduino. WORKING:

The processing is used as a front end software. There are many inbuilt functions present in the processing. The coding is done in java. This software is used to read a file present in the hard disk of the computer and to convert the file into corresponding binary logic. The binary data is sent to the Arduino UNO. The Arduino software is used for coding the Arduino UNO board. Each board have its own syntaxes and functions. The code written for the Arduino UNO is uploaded to the Arduino board through a cable. The code that is present in the Arduino instructs the LED when it has to be ON and when it has to be OFF. The receiver starts from the LDR. The LDR is used to detect the light variations that are present in the transmitting LED and shows the same logic that is transmitted. The LDR is connected to the analogue pins of the Arduino

International Journal of Engineering Trends and Technology (IJETT) – Volume 46 Number 3 April 2017

ISSN: 2231-5381 http://www.ijettjournal.org Page 144

as the LDR is the analogue component. The variations detected by the LDR is sent to the Arduino Uno of the receiver side. The code dumped to the receiver Arduino sends the logic ‘1’ or ‘0’ to the processing software using the serial port. The data that is present in the serial port is received by the processing software. The processing software has coding to read the data present on the serial port and display the original data that is sent from the transmitter and display it on the processing terminal. Any requirements for the GUI is provided by the processing software for some extent. The speed of the transmitting light can be controlled by using the delay functions or by setting the baud rate to the lower value. The errors of this system depends on the baud rate and the sensitivity of the receiver. There should be external disturbances for this system. Light of sight (LoS) propagation is required for the error-less reception of the file. OBSERVATIONS:

In Fig.2, the output in the receiver processing terminal can be observed. The data in the terminal represents the binary logic of the transmitted data. This data can be converted to the asci logic and the character can be observed.

Fig.2: Output in receiver processing terminal In Fig3. Transmission of data using Arduino UNO is displayed, the LED is connected to the 13th digital pin of the Arduino. Here the power is supplied to the Arduino using the pc

Fig. 3: Transmission of Data through light

In Fig.4 the transmitter section can be visualized showing the processing terminal and the Arduino software

Fig.4: Transmission and reception of data through Li-Fi Fig.5: Reception of data using LDR

In Fig.5, the receiver section can be observed. It consists of LDR, receiving Arduino and the receiving PC and the reception of binary logic can be observed. IV.CONCLUSION

Therefore, by using this system, we can obtain a better speeds than Wi-Fi and normal connecting cables which are commonly used for the file transfer. The Radio band crisis problem can also be solved by employing the further existing system with this technology. As internet is not required for any of its software the bandwidth is also conserved hence reducing the network complexity. By further development of this technology can transfer the Files ranging GB’s within few seconds. FUTURE SCOPE:

This Technology can be improved further and can be used to transmit the data to the mobile phones and computers that does not use radio waves for the

International Journal of Engineering Trends and Technology (IJETT) – Volume 46 Number 3 April 2017

ISSN: 2231-5381 http://www.ijettjournal.org Page 145

transmission, home automation, monitoring activities and Li-Fi hotspots which can transmit the data in the order of GBPS.

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