Introduction: LiFi: Transmit Music Using Light

In this instructable I will show you how to convert music to varying light intensity and then transmit it wireless using an LED and a solar cell whose output it seen by a speaker.

Step 1: Demonstration

Step 2: Parts Required

  • 9V Battery
  • Alligator wires
  • Leds (here I use an emergency led light)
  • Solar cell (Preferably above 2V)
  • 3.5mm audio jack to be connected to mobile
  • Speaker

Step 3: Transmitter & Receiver

Connect the 9v battery in series with the audio jack then connect it to the led.

The tip of the speaker jack is connected to positive of the solar cell and negative is connected to the body.

Comments

author
ShobhitR1 (author)2017-02-13

please send me its pdf at ranjanshobhit510@gmail.com

author
AshleyR49 (author)2016-10-09

Wont the 9 volt end up frying your phones sound card.

author
FirestarV (author)AshleyR492017-01-29

I need full pdf

author
SasankaK (author)2016-11-06

can i use LDR instead of solar cell?

author
el10savio (author)SasankaK2016-11-06

Yep, but you should connect a battery in series with it.

author
SasankaK (author)el10savio2016-11-12

How many volts should the battery be?

author
SkipperThe (author)2016-05-12

Hey, just had a question. How do I connect everything, the pictures are a little blurry and can't figure it out.

Thanks

author
el10savio (author)SkipperThe2016-05-23

Thanks for the feedback! I will be uploading a circuit diagram soon.

author
FelixK14 (author)el10savio2016-08-29

could you upload a circuit diagramm soon?

author
DhruvM16 (author)el10savio2016-06-07

Could you please post the diagram soon. I have a school project that's due soon and I really wanted to use this as a demonstration. I'd greatly appreciate it.

Thanks

author
Planetoidex_5 (author)2016-08-12

muy buena canción¡¡¡ :v

author
RajeshwerR (author)2016-01-07

how did you modulated the signal at LEDs during transmission?

author
el10savio (author)RajeshwerR2016-01-09

The phone's audio jack converts a song to an analog signal output to drive the LEDs

author
DhruvM16 (author)el10savio2016-06-07

Does this mean you can use any LED, or does it have to be one with a circuit like the one shown in the pictures?

author
hsharrouf (author)2016-03-15

Would a light dependant resistor (LDR) be convenient for this type of communication? Or is a photodiode better?

author
el10savio (author)hsharrouf2016-03-16

A photo-diode would be better as it has faster switching time.

author
hsharrouf (author)2016-03-15

Would a light dependant resistor (LDR) be convenient for this type of communication? Or is a photodiode better?

author
LázaroA3 (author)2016-01-27

Hi.

You use a microcontroller before transmitting the signal for the LEDs?

author
el10savio (author)LázaroA32016-01-30

No a micro-controller is not required.

author
LázaroA3 (author)2016-01-27

Hello.

You use a microcontroller before transmitting the signal for the LEDs?

author
Alex Mrno (author)2015-11-02

Can you make a video?

author
PRO DR MR BOB (author)2015-10-27

would it work bether with a lazer

author
el10savio (author)PRO DR MR BOB2015-10-28

Lasers are
monochromatic (single color wavelength), collimated (non-divergent) and
coherent (wavelengths in- phase) in contrast, LED's are neither coherent
nor collimated and generate a broader band of wavelengths (multiple).
In addition, a significant difference between the two is the power
output. The peak power output of lasers is measured in watts, while that
of LED's, is measured in milliwatts. Also, LED's usually have a 50%
duty cycle, meaning that they are "on" 50% of the time and "off" 50% of
the time regardless of what frequency (pulses per second) setting is
used. Lasers are good when we want to transmit over large distances. LEDs are also low cost and not harmful like lasers.

author
seamster (author)2015-10-26

Very interesting. Thank you for sharing how you do this!

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