Turns on and off a light emitting diode(LED) connected to digital pin 13, when pressing a pushbutton attached to pin 2. const int buttonPin = 2; // the number of the pushbutton pin const int ledPin = ...

Abstract: The audio system requires a large amount of power to transmit sound energy to all areas both inside and outside the room. Sound waves can propagate in the air and undergo great absorption in ...

This example code is in the public domain. http://www.arduino.cc/en/Tutorial/Array int timer = 100; // The higher the number, the slower the timing.