> For the complete documentation index, see [llms.txt](https://longer-vision-robot.gitbook.io/arduino-full-stack/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://longer-vision-robot.gitbook.io/arduino-full-stack/05_audio_sensors/034_microphone.md).

# 5.4 Microphone

## Hardware Wiring

![Microphone](/files/-LCFEKq6mlBdO7rs3heP)

## Sketch

The code can be found at [Examples\_Arduino - sensor-kit-for-arduino - \_034\_Microphone - \_034\_Microphone.ino](https://github.com/LongerVisionRobot/Examples_Arduino/blob/master/sensor-kit-for-arduino/_034_Microphone/_034_Microphone.ino).

```
int Led=13;       // Define LDE Pin
int buttonpin=3;  // Define D0 sensor's pin
int val;          // Define Variable val
void setup()
{
  pinMode(Led,OUTPUT);      // Define LED as output
  pinMode(buttonpin,INPUT); // Define sensor D0 as output
  Serial.begin(9600);
}
void loop()
{
  val=digitalRead(buttonpin); // Assign digital pin 3's value to val
  if(val==HIGH)   // if anything detected by D0 sensor, LED starts flashing
  {
    digitalWrite(Led,HIGH);
  }
  else
  {
    digitalWrite(Led,LOW);
  }
  Serial.println(val, DEC);
}
```