     sonar_last = millis_now;
   
     unsigned int cm = sonar.ping_cm(); // Send a ping, get ping time in microseconds (uS).
-    Serial.print("Ping: ");
-    Serial.print(cm);
-    Serial.println("cm");
+    //Serial.print("Ping: ");
+    //Serial.print(cm);
+    //Serial.println("cm");
   }
   
   // Check to see if it's time for another melody.

 HC-SR04 Ultrasonic Range Finder.
 Two motors attached to the motor shield.
 speaker/piezo for sound
 */

#include <util/delay.h>

    melody_last = millis_now;
    playMelody();
    
    batteryLevel();
  }
  
}

void playMelody() 
{
  // iterate over the notes of the melody:
  for (int thisNote = 0; thisNote < 8; thisNote++) {

