Crowtail- Sound Sensor

Crowtail- Sound Sensor can detect the sound loudness of the environment. The main component of the module is a simple microphone to receive the sound signal, with band pass filter and a LMV358 amplifier to make the output signal easy to be received by microprocessor.
This module outputs analog signal that shows the relative loudness. Besides, an on-board potentiometer can be used to adjust output voltage.

Wiki & External links

/*
   Sound Sensor
   A simple program demonstrate sound sensor senses a sound that is up to the threshold you set 
   in the code, the LED is on for 1s.
*/ 
const int SOUND_SENSOR=A0 ;         /* sound sensor pin */          
const int  LED=5;          /* LED pin D5*/
#define THRESHOLD_VALUE    300        
#define ON                 HIGH                    /* led on */
#define OFF                LOW                     /* led off */
#define handle_led(x)     digitalWrite(LED, x)    /* handle led */
/* Global Variables */
int sound_value = 0;
void setup() { 
  /* Initialize led pin */
  pinMode(LED, OUTPUT);  
  digitalWrite(LED, LOW);
} 
void loop() {  
 /* read the sound value */
  sound_value = analogRead(SOUND_SENSOR);         
  /* if the value is larger than threshold, turn on led */
  if(sound_value > THRESHOLD_VALUE) {
      handle_led(ON); 
      delay(1000);
  }
  handle_led(OFF);
}