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LiFi, A Bright Idea: Using Sound Output to Analyze the Effect of Distance on Data Transmission through Light Waves

CSEF · 2019 Electronics & Electromagnetics

Affan Mala · Islamic Center of Claremont Community School, Pomona, Los Angeles County

Overview

Objectives Using sound output to analyze the effect of distance on data transmission through light waves. Methods To do this, I first made a Li-Fi model (Li-Fi is a wireless optical networking technology that uses LEDs for data transmission.) imitating real Li-Fi concepts which consist of a transmitter and a receiver. The transmitter in my model includes an LED, a resistor, wires, a 9v battery, and a phone. The receiver includes a solar panel, a PAM 8403 amplifier and a speaker. I then used a ruler to measure 25.4cm, 91.44cm, 182.88cm, 985.36cm. then I measured how many lux were hitting the solar panel, the sound produced in decibels and the width of the light beam from each distance. Results As we increased the distance between the transmitter and receiver, signals started to weaken. However, I could still get strong signals by using a small 10mm LED to transmit signals to distances of up to 985.36cm and still be able to receive sound up to 55 Db. Conclusions I used a small circuit and 10mm LED and I was able to transmit audio to as far as 975.36 cm (10.6 yards). Imagine how good Li-Fi would work if it were outfitted in LEDs in our homes. Imagine networking speeds of 224 Gbps. If I were to have the facility and the equipment, I would have done my project on a grander level by transmitting video and recording the (DTR).

Summary statement

I measured the efficiency of data transmission through light waves by transmitting data from various distances to see how far I can transmit via a 10 mm led and recorded the output in decibels

Help received

This project was done entirely by myself and was based on research I performed. All the experiments, research were performed by myself without any help.

Competition history

  • CSEF 2019 Electronics & Electromagnetics · Entry J1020

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