DIY 1-Way Sound Sensor Module for Arduino

http://dx.com/p/diy-1-way-sound-sensor-module-for-arduino-blue-150778

Features
Sensitivity adjustable, Operation voltage: 3.3V-5V, digital on-off output, with fixed screw hole for easy installation

Application
Detecting the surrounding sound intensity, not available for detecting sound loudness or sound of specific frequency

Sketch
/* Input Pullup Serial This example demonstrates the use of pinMode(INPUT_PULLUP). It reads a digital input on pin 2 and prints the results to the serial monitor. The circuit: * Momentary switch attached from pin 2 to ground * Built-in LED on pin 13 Unlike pinMode(INPUT), there is no pull-down resistor necessary. An internal 20K-ohm resistor is pulled to 5V. This configuration causes the input to read HIGH when the switch is open, and LOW when it is closed. created 14 March 2012 by Scott Fitzgerald http://www.arduino.cc/en/Tutorial/InputPullupSerial This example code is in the public domain */

void setup{ //start serial connection Serial.begin(9600); //configure pin2 as an input and enable the internal pull-up resistor pinMode(2, INPUT_PULLUP); pinMode(13, OUTPUT);

}

void loop{ //read the pushbutton value into a variable int sensorVal = digitalRead(2); //print out the value of the pushbutton Serial.println(sensorVal); // Keep in mind the pullup means the pushbutton's // logic is inverted. It goes HIGH when it's open, // and LOW when it's pressed. Turn on pin 13 when the // button's pressed, and off when it's not: if (sensorVal == HIGH) { digitalWrite(13, LOW); }  else { digitalWrite(13, HIGH); } }