Li fi project presentation
Download as PPTX, PDF0 likes109 views
The document discusses Li-Fi, a technology that transmits data through light using LEDs, offering high-speed, bidirectional communication. It highlights advantages like solving radio frequency congestion and providing secure transmission, while also addressing challenges such as light obstruction and high installation costs. Applications of Li-Fi include traffic lights, safe environments, and public internet hotspots, suggesting a future where every light source could serve as a data transmission hub.
Li fi project presentation
- 1. SEMINAR ON LI-FI Presented By - Ayush Varshney 1611030018 Btech 4th Year Electronics Engineering IERT EDD, Prayagraj Presented To - Mr. Nurmesh Bhartiya Assistant Professor IERT EDD
- 2. Contents Introduction What is LiFi ? Why is it requied ? How LiFi Works LiFi Construction Li-Fi Vs Wi-Fi Applications of LiFi Advantages Limitations or Challenges Conclusion Refrences
- 3. Page 3
- 4. Introduction 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 HARALD HASS
- 5. On 12th July 2011. He used a table lamp with an LED bulb to transmit a video of blooming flowers that was then projected onto a screen behind him. During the event he periodically blocked the light from lamp to prove that the lamp was indeed the source of incoming data. At TEDGlobal, Harald Haas demonstrated a data rate of transmission of around 10Mbps -- comparable to a fairly good UK broadband connection. Two months later he achieved 123Mbps. Back in 2011 German scientists succeeded in creating an800Mbps (Megabits per second) capable wireless network
- 6. WHAT IS LI – FI ?LIGHT FIDEALITY • LI-FI is transmission of data through illumination ,ie sending data through a LED light bulb that varies in intensity faster than human eye can follow. • Li-Fi is bidirectional , high speed and fully networked wireless communications similar to Wifi, Li-Fi is a subset of optical wireless communication (OWC) and can be a complement to RF communication (WiFi or Cellular network ), or a replacement in contexts of data broadcasting .
- 8. WHY IT IS REQUIRED? 1.4 Million 5 Billion • Radio Spectrum is congested but the demand for wireless data double each year .Everything, it seems want to use wireless data but the capacity is drying up.
- 12. Radi o Wave s Infrare d Rays Visibl e Rays Ultraviole t Rays X- Rays Gam a Ray s Gama rays can’t 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 be used with low power. Hence we left with the only the only the Visible- Light Spectrum.
- 13. LED i.e., Light emitting diode can be switched on and off faster since operating speed of LED is less than 1 μs, than the human eye can detect, causing the light source to be appear continuously. This invisible on-off activity enables a kind of data transmission using binary codes. Switching on and LED is a logical ‘1’, switching it off is a logical ‘0’.It is possible to encode data in the light by varying the rate at which LED’s flicker on and off to give different strings of 1s and 0s. Modulation is so fast that human eye doPagee 1s4 n’t notice Basic concepts
- 14. How LI-FI Works ? 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. Wehave to just vary the rate at which theLED’s flicker depending upon the data we want to encode Thus every light source will works as a hub for data transmission
- 16. Further enhancements can be made in this method, like using an array of LEDs for parallel data transmission, or using mixtures of red, green and blue LEDs to alter the light‘s frequency with each frequency encoding a different data channel. Such advancements promise a theoretical speed of 10 Gbps –
- 18. LI FI CONSTRUCTION The LI FI product consists of 4 primary sub-assemblies: • Bulb • RF power amplifier circuit (PA) • Printed circuit board (PCB) • Enclosure 3-The PCB controls the electrical inputs and outputs of the lamp and houses the microcontroller used to manage different lamp functions. 2- An RF (radio-frequency) signal is generated by the solid-state PAand is guided into an electric field about the bulb. The high concentration of energy in the electric field vaporizes the contents of the bulb to a plasma state at the bulb’s center; this controlled pasma generates an intense source of light. All of these subassemblies are contained in analuminum enclosure.
- 19. LiFi Vs Wi-Fi • Li-Fi can be thought of as a light- based Wi-Fi. That is, it uses light instead of radio waves to transmit information. • And instead of Wi-Fi modems, Li- Fi would use transceiver-fitted LED lamps that can light a room as well as transmit and receive
- 21. POTENTIAL APPLICATION OF LI-FI Li Fi technology is still in its infancy .However some areas where it seems perfectly applicable are:- 1 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.
- 23. 2-INTRINSICALLY SAFE ENVIRONMENT Visible Light is more safe than RF, hence it can be used in places where RF can't be used such as petrochemical plants . 2
- 24. 3- Airlines Whenever we travel through airways we face the problem in communication media ,because the whole airways communication are performed on the basis of radio waves. To overcomes this drawback on radioways , li-fi is introduced.
- 25. There are millions of street lamps deployed around the world. Each of these street lamps could be a free access point. PUBLIC INTERNET HOTSPOTS
- 26. ADVANTAGES OF LI-FI Li-Fi can solve problems related to the insufficiency of radio frequency bandwidth because this technology uses Visible Light spectrum that has still not been greatly utilized. High data transmission rates of up to 10 Gbps can be achieved. Since light cannot penetrate walls, it provides privacy and security that Wi-Fi cannot. Li-Fi has low implementation and maintenance osts.
- 27. Limitations or challenges -# Light can't pass through objects #. Interferences from external light sources like sun light, normal bulbs, and opaque materials in the path of transmission will cause interruption in the communication. #High installation cost of the VLC systems #A major challenge facing Li-Fi is how the receiving device will transmit back to transmitter.
- 28. CONCLUSI ON 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 hotspots to transmit wireless data.
- 29. REFREN CES 1..http://www.electronicsforu.com/electronicsforu/ci rcuitarchives/view_article.asp?sno=778&title%20= %20Li- Fi%3A+A+New+Paradigm+in+Wireless+Communi cation&b_type=new&id=12042 2. http://en.wikipedia.org/wiki/Li-Fi 3. International Journal of advances in computing & communications, vol 1, 2013,page no-12 www.ijacc.org
- 30. Page 38