Data transmission through LI-FI

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056
Volume: 04 Issue: 02 | Feb -2017 www.irjet.net p-ISSN: 2395-0072
© 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1751
DATA TRANSMISSION THROUGH LI-FI
Prof. Prajakta Jadhav1, Shazia Khatib2, Kaisahemd Maner3
1Assistant Professor & TC, Dr.D.Y.Patil Institute of Engg. Management and Research, Pune, Maharshtra, India
2Student, E&TC, Dr.D.Y.Patil Institute of Engg. Management and Research, Pune Maharshtra, India
3 Student, E&TC, Dr.D.Y.Patil Institute of Engg. Management and Research, Pune Maharshtra, India
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Abstract – The following paper clarifies the use of visible
light spectrum for data communication. In particular, it will
show how Li-Fi enhances VLC by using light emitting diodes
(LEDs) to implement fully networked wirelesssystem. Li-Fi can
be a new contribution in one of the efficient wireless data
transmission systems. Due to its excellent speed feature it
holds a great scope in future application. Using the concept of
Li-Fi we are implementing a module wherein a buggy is being
drove based on commands sent through LED light.
Key Words: VLC (visible light communication), LED (light
emitting diodes, Li-Fi(Lightfidelity),Wi-Fi(wirelessFidelity).
1. INTRODUCTION
Due to the escalating use of wireless data
communication, the present radio spectrum below 10 GHz
(cm-wave communication) is getting saturated .
Researchers in wireless technology have responded to this
problem by considering the upper layer of t he
spectrum i.e. the VLC spectrum . Li-Fi is a newly
emerged wireless technology that hasthescopeofproviding
efficient and best connectivity within indoor network
environment. The prior essence of this technology is that it
enables us to send the information with the help of light
illumination. At the University of Edinburgh in an ongoing
conference, Prof. Harald Hass showed how vlc can be used
for data communication. He demonstrated this by sending a
HD video within just a few seconds with the help of light
illumination .The term Li-Fi was thus coined by him i.e. light
fidelity. He foresees a future where a normal led bulb in a
room could be used for data communication for devices like
mobile phones, laptops, computers etc. Additional boon to
this technology is security as light cannot be seen therefore
data cannot be accessed.
1.1 VLC (Visible Light Communication):
That part of the VLC spectrum which is visible to the
human eye is the visible lightspectrum.Thevisiblelightisthe
electromagnetic radiation in this range of wavelengths. The
band width of this spectrum corresponds to 430-770 THz
Imagine that how a flash light can be used to send the
mores code. If the flash light is made on and off very quickly
according to the binary data of user requirement we get a
system wherein there is communication plus illumination.
This can now be defined as visible light communication. For
this just the provision of transreciever is need to be done
which is not at all a difficult part. Thus we can see the light
but not the data. This gives us an idea of what VLC specifies
or is meant.
Fig -1: Visible Light Communication.
1.2 objective:
The main objective is to make data transmission
through light with the help of LI-FI . In this system there two
are modules one of which is sender and other is receiver. At
the sender side a circuit modulates light current and
illuminates the LEDs according to the data we wish to
transmit. At the receiver side thereis a decodercircuitwhich
actually consists of an octo-coupler. Initially it will sense the
flicker in light and give information to the controller so that
controller can drive dc motor according to thedata received.
2. Analogy
Table below shows the the parameter of Li-FI analogues
to Wi-Fi. It highlights the key features of Li-Fi.

Table -1: Features of Li-Fi & Wi-Fi.
Parameter LI-FI WI-FI
Speed High High
Spectrum Wider 10000
times
Relatively much
narrow
Data Density High Low
Security Much secure
coz light cannot
pass through
solid objects
Not that secure
coz this system is
more
transparent.
Reliability Medium Medium
Bandwidth High due to
broad
spectrum
Low
Ecological
Impact
Low Medium
Obstacle
Interference
High Low
Bill of Material High Medium
Market
Maturity
Low High
Latency In
microseconds
In milliseconds
3. Scope of Li-Fi:
Li-Fi is still in its incipient stages and thus offers
tremendous scope for future research and innovation. The
following is a brief review of research being conducted inthe
field and future scope of this technology. Researchers are
developing micron sized led’s .whichflicker1000timesfaster
than normal LED’s. They providefasterdatatransferandalso
take up less places. Moreover 1000 micron led’s can fit into
area required 1sq mm large single led. A 1 sq.mmsizedarray
of micron sized LEDs could hence communicate 1000×1000
(i.e. a million) times as much information as a single 1mm
LED. Speed more than 10gbps is possible to be achieved. In
the Heinrich Hertz Institute in Berlin, Germany, researchers
have achieved data rates of over 500 megabytes per second
by just using a standard white led.
Fig -2: The principal building blocks of Li-Fi and its
application areas
3. Proposed Work
The proposed plan of action is to make a system
working on optical wireless communication. This model
should effectively be able to transmitdata fromonedevice to
another using LEDs. The system block diagram to be used in
is as follows it consist of transmitter and receiver section.
3.1 Transmitter section:
The transmitter section consist of the data input
which is fed into the raspberry pi via the Wi-Fisystemwhich
is inbuilt in the raspberry pi-3. The data inputsisnothingbut
the commands that are built into the android app. the
raspberry pi controls the flickering of the interfaced LEDs
according to the command (data) fed into it with the help of
the Li-Fi transmitter circuit.

Fig -3: Li-Fi transmitter section
3.2 Receiver section:
The flickering of the LEDs is detected by the photo
diode on the receiving circuit of the Li-Fi. This modulated
data is then fed into the microcontroller(i.e. PIC16f877). The
controller then controls the gestures of the interfaced motor
with the help of motor driver according to the given
command (data).
Fig -4: Li-Fi receiver section
3.3 Flowchart:
The work flow of the project is as follows
4. Advantages:
 Visible light spectrum is 1000 times wider with
compare to the radio wave spectrum.
 Li-Fi is a harmless alternative as compared to radio
waves (RF), because in RF waves the
electromagnetic interference takes place in
environments such as in mines and petrochemical
sectors.
 Li-Fi makes use of a free band that does not need
any licensing high speed it offers theoretical speed
in the order of gigabits/sec.
 Wi-Fi does not work underwater but Li-Fi does and
hence can be used for undersea explorations.
 LED lights eat less energy and are very competent.
As it uses less energy it is economical and easy to
use.
5. Disadvantages:
 The major disadvantage of this technology is that
light cannot pass through obstacles. Therefore it
cannot pass through walls and many such objects
and can be blocked easily. We can seamlessly
change back over to radio waves in such a case.

 The signal will b cut out if the receiver gets covered
completely.
6. Applications:
 Light waves don’t emit radiations as that of radio
waves. So it is less harm full as compare to the RF
waves. Therefore they can be used where radiation
is the critical parameter.
 Street lights can be used in future as Li-Fi hotspot.
They can also be used to control and monitor the
data.
 Li-Fi is extremely useful in communication where
security is the major aspect. These involve various
military applications.
 Wi-Fi is often prohibitedinaircrafts.However,since
aircrafts already contain multiple lights, thus Li-Fi
can be used for data transmission.
7. CONCLUSION
Using the concept of Li-Fi this model can be
implemented which depicts how light can be used for
transfer of data. Many such applications are possible using
Li-Fi coz of its great future scope and multiple benefits. Li-Fi
enhances the new technology to extract the maximum
benefits out of it.
REFERENCES
[1] Mrs.Padmini Mishra,Mrs Jyoti Potadar, Mrs.Sonu Priya
“A review of LIFI:green WI-FI” MARCH 2016
IRJET(International reserch jouranl of engg and tech).
[2] M.Afgani, H.Haas, H.Elgala and D.Knipp, “Visible Light
Communication using OFDM” in Proc. of the 2nd
International Conference on Test beds and Research
Infrastructures for the Development of Networks and
Communities (TRIDENTCOM), Barcelona, Spain, March
1-3 2006, pp. 129-134
[3] Dhakne Vikas, Ravi Nibalkar “Light fidelity: A
reconnaissance of future tech” Nov 2013, IJARCSSE
(International Journal ofAdvanceResearchinComputer
Science and Software engineering.)
[4] R.Kartika, S.Balakrishnan, “Wireless communication
using Li-Fi tech”, s3 march 2015 IJECE(International
Journal of Electrical and Computer Engineering)
[5] M.Afgani, H.Haas, H.Elgala and D.Knipp, “Visible Light
Communication using OFDM” in Proc. of the 2nd
International Conference on Test beds and Research
Infrastructures for the Development of Networks and
Communities (TRIDENTCOM), Barcelona, Spain, March
1-3 2006, pp. 129-134.
[6] H. Haas, “Wireless data from every light bulb”, TED
Website, Aug. 2011. [Online]. Available:
http://bit.ly/ted_vlc.
[7] H. Elgala, R. Mesleh, and H. Haas, “Indoor Optical
Wireless Communication: Potential and State-of-the-
Art”, IEEE Communications Magazine, vol. 49, no. 9, pp.
56-62, Sep. 2011, ISSN: 0163-6804.
[8] technopits.blogspot.comtechnology.cgap.org/2012/01/
11/a-lifi-world
[9] http://www.extremetech.com/computing/152740-
researchers-create-3gbps-lifinetwork-with-led-bulbs
[10] Li-Fi (Light Fidelity)-The future technology In Wireless
Communication Neha Singh, International Journal of
advances in computing & communications, vol. 1, 2013
www.ijacc.org
[11] seminarprojects.com/s/seminar-report-on-li-fi
[12] the-gadgeteer.com/2011/08/29/li-fi-internet-at-the
speed- Of-light
[13] “Visible-light communication: Tripping the light
fantastic: A fast and cheap optical version of Wi-Fi is
coming”, Economist, dated 28Jan 2012.
[14] International Journal of Applied Engineering Research,
ISSN 0973-4562 Vol.7 No.11 (2012)
http://www.ripublication.com/ijaer.html

Data transmission through LI-FI

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