LI-FI is a technology that transmits data through illumination by using LED light bulbs that vary in intensity faster than the human eye can detect. It began development in the 1990s where researchers discovered LEDs could transmit data. LI-FI works by transmitting either a 1 or 0 by turning an LED on or off very quickly. It has advantages over Wi-Fi like higher speeds, more security, and being harmless. Potential applications include using traffic lights that communicate between cars to help prevent accidents. Further exploration of using every light bulb as a wireless access point could lead to a cleaner, greener future.

1. WELCOME

3. WHAT IS LI – FI ?
 LI-FI is transmission of data through illumination
,sending data through a LED light bulb that varies
in intensity faster than human eye can follow

4. HISTRO
Y
The technology truly began during the
1990's in countries like
Germany, Korea, and Japan where they
discovered LED's could be retrofitted to
send information. Harald Haas continues to
wow the world with the potential to use
light for communication

5. HOW LI-FI WORKS ?
If the led is on, you transmit a digital 1, if its off you transmit a 0.
 operational procedure is very simple, if the led is on, you transmit a digital
1, if its off you transmit a 0. The LEDs can be switched on and off very
quickly, which gives nice opportunities for transmitting data. Hence all that us
required is some LEDS and a controller that code data into those LEDs.

6. WORKING PROCESS

8. Radio
Waves
Infrared
Rays
Visible
Rays
Ultraviolet
Rays
X- Rays
Gama Rays
 Gama rays cant be used as they could be dangerous.
X-rays have similar health issues.
Ultraviolet light is good for place without people, but other wise
dangerous for the human body.
Infrared, due to eye safety regulation, can only bse used with low power.
HENCE WE LEFT WITH THE ONLY THE VISIBLE - LIGHT SPECTRUM.

9. DIFFERENCE BETWEEN THE
TECHNOLOGIES

10. TRANSMITTING ELEMENT
LED
Fluorescent Lamp

11. RECEIVING ELEMENT
(DETECTOR)
Avalanche Photo Diode
Image Sensors

12. AN ILLUSTRATION OF LI-FI
CONCEPT

13. POTENTIAL APPLICATION OF LI-FI
Li Fi technology is still in its infancy .However some areas where it seems
perfectly applicable are:-
 TRAFFIC LIGHTS
 Traffic lights can communicate to the car and with each other.
Cars have LED-based headlights, LED-based cack lights, and cars
can communicate with each other and prevent accidents in by
exchanging information.

14. ADVANTAGES :::::
Capacity
Availability
Efficiency
High Security
Easy To Use
Fast Data Transfer
Harmlessness
Low-cost

15. CONCUSSION
The possibilities are numerous and can be explored further. If this
technology can be put into practical use, every bulb can be used
something like a Wi-Fi hotspot to transmit wireless data and we
will proceed toward the cleaner, greener, safer and brighter future.