Transmitting audio signal through Light

This post will demonstrate the transmission of an audio signal using light and solar panel.

Introduction- 

In this post, we are going to generate an audio signal and then transfer it through LED and receive it on a solar panel based receiving system.

This transmission of audio is through amplitude modulation, the light coming through the LED is being modulated according to the audio signal and the receiving system is altering the current accordingly to produce the sounds.

Amplitude Modulation - 

In amplitude modulation, the amplitude of the carrier wave is modulated in proportion to the message that is being transmitted.

Components required- 

1. A solar panel (any wattage)

2. LED 

3. Transistor (I used BC547)

4. Buzzer/Speaker 

5. Arduino (For generating audio) - You can use any other audio source.

Connections- 

1. Connect the Pin 3 on the Arduino to the LED.

2. Connect the first terminal of the Speaker to the Vcc of the supply and the other terminal to the collector of the transistor.

3. Connect the base of the transistor to the +ve of the solar panel and -ve to GND.

4. Connect the emitter to the GND.

Arduino code-

https://www.hackster.io/jrance/super-mario-theme-song-w-piezo-buzzer-and-arduino-1cc2e4