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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.

<p>please send me its pdf at ranjanshobhit510@gmail.com</p>
Wont the 9 volt end up frying your phones sound card.
I need full pdf
<p>can i use LDR instead of solar cell? </p>
<p>Yep, but you should connect a battery in series with it.</p>
<p>How many volts should the battery be?</p>
<p>Hey, just had a question. How do I connect everything, the pictures are a little blurry and can't figure it out.</p><p>Thanks</p>
Thanks for the feedback! I will be uploading a circuit diagram soon.
<p>could you upload a circuit diagramm soon?</p>
<p>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.</p><p>Thanks</p>
<p>muy buena canci&oacute;n&iexcl;&iexcl;&iexcl; :v</p>
<p>how did you modulated the signal at LEDs during transmission?</p>
<p>The phone's audio jack converts a song to an analog signal output to drive the LEDs</p>
<p>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?</p>
<p>Would a light dependant resistor (LDR) be convenient for this type of communication? Or is a photodiode better? </p>
A photo-diode would be better as it has faster switching time.
<p>Would a light dependant resistor (LDR) be convenient for this type of communication? Or is a photodiode better? </p>
<p>Hi.</p><p>You use a microcontroller before transmitting the signal for the LEDs?</p>
No a micro-controller is not required.
<p>Hello.</p><p>You use a microcontroller before transmitting the signal for the LEDs?</p>
Can you make a video?
<p>would it work bether with a lazer</p>
<p>Lasers are <br>monochromatic (single color wavelength), collimated (non-divergent) and <br>coherent (wavelengths in- phase) in contrast, LED's are neither coherent<br> nor collimated and generate a broader band of wavelengths (multiple). <br>In addition, a significant difference between the two is the power <br>output. The peak power output of lasers is measured in watts, while that<br> of LED's, is measured in milliwatts. Also, LED's usually have a 50% <br>duty cycle, meaning that they are &quot;on&quot; 50% of the time and &quot;off&quot; 50% of <br>the time regardless of what frequency (pulses per second) setting is <br>used. Lasers are good when we want to transmit over large distances. LEDs are also low cost and not harmful like lasers.</p>
<p>Very interesting. Thank you for sharing how you do this!</p>

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