In this post we discuss about the making of a simple Li-Fi transmitter circuit for transferring music data from your cell phone to a loudspeaker system by using LED light waves and no wires, that is the LED light which may be illuminating your room will also be transmitting music from your cellphone to the loudspeaker system...that's using the same light for doing two things together, in a hassle free manner.
Light Fidelity (Li-Fi) is a innovative paradigm in wireless transmission. In this post, we illustrate the model of a Li-Fi dongle (transmitter) and speaker (receiver) intended for sound and music applications. The suggested strategy is an upgraded version for wired audio system that plays audio signals acquired by means of light. The dongle could be manufactured for lower than $2.
History of Li-Fi
Professor Harald Haas created the phrase "Li-Fi" at his 2011 TED Global Talk where he unveiled the concept of "wireless data from every single lighting". He is a Chair Professor of Mobile Communications in the University of Edinburgh, and the co-founder of pureLiFi.
The typical expression "visible light communication" (VLC), whose historical past goes back to the 1880s, consists of virtually any connectivity to the visible light component of the electromagnetic range to transfer data. The D-Light venture at Edinburgh's Institute for Digital Communications had been financed from January 2010 to January 2012. Haas marketed this technological know-how in his 2011 TED Global talk and made it easier for starting an organization publicize it. PureLiFi, earlier known as pureVLC, is an original equipment manufacturer (OEM) business established to commercialize Li-Fi products for incorporation with prevailing LED-lighting devices. Oledcomm, French company set up by Pr Suat Topsu from Paris-Saclay University.
In October 2011, organizations and industry groups shaped the Li-Fi Consortium, to advertise high-speed optical wireless systems and to triumph over the restricted quantity of radio-based wireless spectrum accessible by applying an entirely diverse section of the electromagnetic spectrum.
Numerous organizations provide uni-directional VLC products, that is not similar to Li-Fi - a expression described by the IEEE 802.15.7r1 standardization committee.
VLC technology had been displayed in 2012 implementing Li-Fi. Through August 2013, data rates of more than 1.6 Gbit/s were confirmed within a solitary color LED. In September 2013, a news release declared Li-Fi, or VLC techniques in general, usually do not demand line-of-sight situations. In October 2013, it was documented Chinese manufacturers were concentrating on Li-Fi development kits.
In April 2014, the Russian company Stins Coman declared the roll-out of a Li-Fi wireless local network called BeamCaster. Their existing module transfers data at 1.25 gigabytes per second (GB/s) however they anticipate enhancing speeds up to 5 GB/s sometime soon. In 2014 the latest record was founded by Sisoft (a Mexican company) which was capable of transfering data at rates of speed of up to 10 GB/s around a light spectrum imparted by LED lamps.
How the Li-Fi Circuit Works
The figure exhibits the circuit of the Li-Fi dongle. The idea uses just a single BJT hooked up with the input music signal. The Li-Fi loudspeaker is fashioned by hooking up the output of a 3V, 200mA solar cell to a speaker’s audio input. To achive this, attach the terminals of the solar cell to a 3.5mm music jack. Subsequently, link up the 3.5mm audio jack through the loudspeaker to the audio socket.
The optimum range between the transmitter and receiver is determined by the number of power of the LED driver or the BJT circuit. For the indicated Li-Fi circuit, the absolute maximum range is approximately two metres provided the LED is a high bright 1 watt to 3 watt type.
Where can Li-Fi be Applied
This circuit can be effectively used for the below given following applications:
Use and exploit music and audio from your cell phone, MP3 player, laptop, tablet or various other cellular sound system wirelessly to Li-Fi speakers.
Make use of study lights in vehicles, train locomotives, automobiles and airplanes to play melodious songs wirelessly on Li-Fi speakers.
Transmit sound signals coming from a mic to audio speakers within an auditorium using pre-installed LED lights.
The device may be used in workplaces, accommodations, auditoria, etc, wherever bright LED illumination is needed during the day.
Advantages of Li-Fi
This Li Fi system wins over Wireless bluetooth speakers due to the following reasons:
The LED light within a space can be used not only to illuminate the space but additionally to play music, this provides advantages of all things available.
Furthermore, LED lamps consume EIGHTY-FIVE % less power than incandescent bulbs and last as long as 20 times more, while most of Bluetooth modules are battery driven and usually keep working for a couple of years only before they require replacing. For this reason the proposed technique is energy-efficient over Wireless bluetooth variation.
Anyone could acquire Li-Fi data so long as the person is within the range of the light being released through the LED source of light. Therefore, the product range will depend on the potency of the LED light being released.
Connectivity must be recognized across the Bluetooth transmitter and the receiver, in contrast in Li-Fi any individual can easily receive data and enjoy music in the speaker by merely maintaining the receiver within the range of LED source of light.
The recommended method works extremely well with any kind of sound system by simply hooking up the Li-Fi dongle with its music line out, without any integrating and connection requests. This defeats the situation of hooking up a Bluetooth speaker to audio devices which often do not have USB port and Wireless bluetooth assistance, which can be in any other case a more difficult undertaking.
The offered Li-Fi dongle and speaker costs less than a Bluetooth dongle and speaker.
The suggested notion is illustrated in Fig. 1. It works with a Li-Fi dongle to transfer music signals coming from a source such as cell phone, and a Li-Fi loudspeaker with solar cells at the receiver end to receive music signals with no wires.
The suggested Li-Fi dongle is attached to the music jack output located on mobile phones. It possesses an LED by which audio/music impulses are carried as light impulses. These light signals are picked up by the Li-Fi loudspeaker with the solar cell array.
Parts List
Resistors 1/4 watt 5%
4k7 = 1
1K = 1
4K7 pot = 1
Capacitors
2.2uF/25V = 1
220uF/25V = 1
100nF = 1
Semiconductors
Transistor 8050 = 1
IC TDA7052 = 1
1 watt LED = 1
3 V Solar Cell = 1
