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Audio Transmission using LED

The slides illustrate and visualize the design of a simple LIFI application-underwater communication. Using some pre-programmed modules with the aim of understanding the concept of VLC visible light communication.<br><br>Read full preprint: https://www.researchgate.net/publication/348294258_Conceptual_Design_of_LiFi_Audio_Transmission_Using_Pre-Programmed_Modules

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Audio Transmission using LED

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  1. Audio Transmission using LED VLC/LIFI A low cost illustration of Application of Audio Transmission using VLC.

  2. History The technology truly began during the 1990's in countries like Germany, Korea, and Japan where they discovered that LED's could be used to send information.  Harald Haas continues to how the world with the potential to use light for communication. LIFI LI-FI is transmission of data through a LED light bulb that varies intensity faster than human eye can follow

  3. Operational procedure is very simple, if the LED is on, you transmit a digit ‘1’, or data is transmitted if it is off you transmit a ‘0’ and data is not transmitted • The LEDs can be switched on and off very quickly, which gives nice opportunities for transmitting data. • Hence all that required is some LEDS and a controller that code data into those LEDs. How LI-FI Works

  4. The driving circuit consists of a control circuit and output stage to modify the data and make it ready to be sent. The receiving circuit consists of a filter to select the required band, amplification stage to provide the required Signal to Noise ratio in order to demodulate the signal. BLOCK DIAGRAM Usually, we add to these components some necessary circuits like a driving circuit and a receiving circuit.

  5. LIFI Application Using pre-programmable modules to illustrate the application of LIFI Underwater Communications

  6. Submarines could use their headlamps to communicate with each other, process data autonomously and send their findings periodically back to the surface in Underwater Remotely Operated Vehicles (ROV). Another important issue is that Li-Fi can even work underwater where Wi-Fi fails completely, thereby it's open for military operations UNDERWATER COMMUNICATIONS Using RF signals is impractical due to strong signal absorption in water. Li-Fi provides a solution for short-range communications.

  7. What you need Photo diode Light source We used the light source as our transmission source. we use the solar panel as receiving module speaker We use one speaker to output the receiving signals amplifier We used PAM8403 as our audio amplifier. AUX we use an auxiliary cable (AUX) as a communications cable.

  8. LIFI Transmitter

  9. The AUX also known as audio jack receive signals form device and transfer analogue audio signals to the LED. In which drives the LED using on-off-keying (OOK) Modulation. If the LED is on, it transmits a digital 1 otherwise it transmits a digital 0. The LEDs is switched on and off quickly to transmit data that can't be detected by a human eye. Transmission section In the transmission section there is a LED, a battery and an auxiliary cable (AUX) for audio transmission

  10. From the diagram 1 and 2 are power input. • 3 and 4 are for communication (transmission). • 2 and 4 are USB Port and AUX port. • 1 and 3 are alternative of 2 and 4. Amplifier Module 1 Description: Bluetooth voice player. It support Bluetooth wireless connections. Smart home playback

  11. 1 Using AUX communication cable and USB cable as power source.

  12. 2 Directly connecting the modules.

  13. Transmitter Module

  14. LIFI Receiver

  15. The photo detector in this case the solar panel absolved the ones and zeros from the LED source This signals (ones and zeros) are demodulated and amplified by the audio amplifier. The light intensity is absorbed by solar panel then the audio signal come out using a speaker. Receiver Section On the receiver section there is a solar panel, which convert this light into electric signals and it will pass the electric signals to the PAM8403 audio amplifier.

  16. 3W Output at 10% THD with a 4Ω Load and 5V Power Supply • Filter less, Low Quiescent Current and Low EMI • Low THD+N • Superior Low Noise • Efficiency up to 90% • Short Circuit Protection Amplifier Module 2 Description: The PAM8403 is a 3W, class-D audio amplifier. It offers low THD+N, allowing it to achieve high-quality sound reproduction

  17. Receiver circuit

  18. The point of this presentation is to illustrate and visualize the design of LIFI application-underwater communication. Using some pre-programmed module with the aim of understanding the concept of VLC visible light communication. Summary

  19. [1] Prerna Chauhan, RitikaTripathiJyoti Rani, "Li-Fi (Light Fidelity)-The future technology In Wireless communication," International Journal of Applied Engineering Research, Nov 2012. [2] M. Mutthamma, "A survey on Transmission of data through illumination - Li-Fi," International Journal of Research in Computer and, Dec 2013. [3] (2015) wikipedia. [Online]. http://en.wikipedia.org/wiki/Visible_light_communication [4] Raafat Ali Ali , “Light Fidelity (Li-Fi) Technology ” Higher Institute for Applied Sciences and Technology Communications Department 4th year, SEMINAR , April 2nd, 2015. [5] https://www.diodes.com/assets/Datasheets/PAM8403.pdf Reference

  20. Thank You Auwal Amshi auwalamshi@gmail.com

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