import lejos.nxt.*;
 
public class HalloSoundSensor {
 
   public static void main(String[] args) throws Exception {
 
      SoundSensor sound = new SoundSensor(SensorPort.S1);
 
      while (!Button.ESCAPE.isPressed()) {
 
           LCD.clear();

           for (int i = 0; i < 100; i++) {
 
              LCD.setPixel(1, i, 60 - (sound.readValue() / 2));
              Thread.sleep(29);
           }
     }
  }
}