Skip to main content

LI-FI AUDIO TRANSMISSION



Audio Transfer using Li-Fi Technology

AUDIO
By DEVANANDA REDDY



Audio Transfer using LED and Li-Fi Technology

With the boom of Smart Phones, Internet of things (IoT), Industrial Automations, Smart Home Automation systems etc. the demand for internet is also growing exponentially. The technology has evolved so much that everything from our car to our refrigerator needs a connection to the internet. This raises other questions like; Will there be enough bandwidth for all these devices? Will these data be secure? Will the existing system be fast enough for all these data? Will there be too much conjunction on network traffic?
All these questions will be tackled by this upcoming technology called Li-Fi. So what is LiFi? The term Li-Fi stands for “Light Fidelity”. This is believed to be the next generation of internet, where Light will be used as a medium to transport data. Yes you read it right; it is the same Light that you use in your homes and offices which, with some modifications can be used to transmit data to all your devices that requires internet. In this project we will build a simple circuit to transfer Audio Data using Li-Fi. But first we will learn about Li-Fi Technology.

How Li-Fi Works

As told earlier Li-Fi uses light to transmit data unlike Radio waves. This idea was first coined by Prof. Harald Haas in one of his TED talk in 2011. The definition for Li-Fi can be given as “LiFi is high speed bi-directional networked and mobile communication of data using light. LiFi comprises of multiple light bulbs that form a wireless network, offering a substantially similar user experience to Wi-Fi except using the light spectrum”
Every LED lamp should be powered through an LED driver, this LED driver will get information from the Internet server and the data will be encoded in the driver. Based on this encoded data the LED lamp will flicker at a very high speed that cannot be noticed by the human eyes. But the Photo Detector on the other end will be able to read all the flickering and this data will be decoded after Amplification and Processing. The data transmission here will be very fast than RF. Here we are using Solar panel at the receiving end to sense light.

Transmitting data through photo diodes has been happening for a long time through our IR Remotes. Every time we pressed a button on our Television remote the IR LED in the Remote pulses very fast this will be received by the Television and then decoded for the information. But, this old method is very slow and cannot be used to transmit any worthy data. Hence with LiFi this method is made sophisticated by using more than one LED and passing more than one data stream at a given time. This way more information can be passed and hence a faster data communication is possible.

Now, we will see how we can transfer and receive audio signals using a simple LED and solar cell plate. If you are interested in this technology you can learn more about Li-Fi here.

Materials required:

  1. 5-6V Solar Panel
  2. 1 W LED or NeoPixel LED strip
  3. Aux cable
  4. 3.5 mm Jack
  5. 9V Battery
  6. Pre amplified speaker

We have two circuits one for Receiver side and other for transmitter side.

Transmitter Circuit for Li-Fi:

On transmitter side, we have white Bright LED and a battery which are connected to 3.5mm jack and jack will be connected to audio source. Here we are using battery to power up the LEDs because there is less power coming from the audio source which is not enough to power the LEDs. Connections are shown below in the circuit diagram:
Transmitter Circuit for Li-Fi

Receiver Circuit for Li-Fi:

On receiver side, we are using Solar panel and a speaker which is connected by an Aux cable. You can also make you own amplifier circuit for receiving end, which has been explained later in this article.
Receiver Circuit for Li-Fi

Working of Audio Transfer circuit using Li-Fi:

In transmitter side, when we connect 3.5mm jack to audio source LED will glow but there is no fluctuation in the intensity of light when the audio source is OFF. As soon as you play the audio, you will see that there is frequent change in intensity of light. When you increase the volume, LED’s intensity is changing faster than the human eye can follow.
Solar panel is so sensitive that it can catch small intensity change and correspondingly there is change in the voltages at output of solar panel. So, when the light of LED falls on the panel, voltages will varies according to the intensity of light .Then voltages of solar panel is fed into amplifier (Speaker) which amplifies the signal and giving the audio output through the speaker connected to the amplifier.
Output will come as long as solar panel is in contact of LED’s. You can put the LED’s at max. 15-20cm distance from the solar panel to get the clear audio output. You can further increase the range by increasing the area of solar panel and higher wattage Power LED.


Vedio:


Click here to download

Comments

Post a Comment

Popular posts from this blog

MINI TELSA COIL (WIRELESS ENERGY TRANSMISSION)

How to Make a Mini Tesla Coil 9v POWER By  DEVANANDA REDDY How to Make a Mini Tesla Coil 9v Be it an ordinary high school project or a mind blowing arcing project, a  Tesla Coil  is always fun to build and will definitely make your project look cool and attractive.  A Tesla Coil is a simple coil that creates a high voltage electric field in the air when a small input power (9V) is provided, this electric filed is strong enough to glow small light bulbs. This principle was invented by the  Nicola Tesla , who also holds the credit for inventing Induction Motors, AC current, neon bulbs, Remote controls etc.. This  Mini Tesla Coil Circuit  is very simple and just works with a help of 9V battery and very few commonly available electronic components, which makes it is very easy to build (fingers crossed). There are a handful number of people who have tried this project already and have failed to obtain the result;...
Post a Comment
Read more

Smartphone to Digital Microscope Conversion

Smartphone to Digital Microscope Conversion! By DEVANANDA REDDY The world is an interesting place, but it's fascinating up close.  Through the lens of a microscope you can find details that you would otherwise never notice.  But now you can. This instructable will show you how to build a stand for about $10 that will transform your smartphone into a powerful digital microscope. This DIY conversion stand is more than capable of functioning in an actual laboratory setting. With magnification levels as high as  175x  375x  Edit:  with the addition of a second lens  magnification can be as high as 375x , plant cells and their nuclei are easily observed!  In addition to allowing the observation of cells, this setup also produces stunning macro photography. The photos in this instructable were taken with an iPhone 4S. Watch the video below for a quick overview of the project! Step 1: Materials an...
Post a Comment
Read more

Control Robotic Car With Voice

Control Robotic Car With Voice By DEVANANDA REDDY 3041 Advertisement This project describes the implementation of a voice-controlled robotic car using Arduino. In this project, the user gives specific voice commands to the robot through an Android app installed on the smartphone. At the receiving side, a Bluetooth transceiver module receives the commands and forwards them to the Arduino on the robotic car. Arduino controls the movements of the robot according to received commands. The robot moves forwards, backwards, left and right, and stops according to the voice commands forward, backward, left, right and stop, respectively. The authors’ prototype of the voice-controlled robotic car is shown in Fig. 1. Fig. 1: Authors’ prototype of the voice-controlled robotic car The system consists of a transmitter (Android smartphone) and a receiver (robot). Block diagrams of the transmitter and receiver sides are shown in Figs 2 and 3, respectively. Screenshot of the...
Post a Comment
Read more