  */
 void setup() {
   pinMode(BUZZER, OUTPUT);
+  pinMode(BUZZER_BATTERY, OUTPUT);
   pinMode(OBSTACLE_SENSOR, INPUT);
+  pinMode(OBSTACLE_BATTERY, OUTPUT);
 
   lastObstacleValue = HIGH;
 }

      }
  }
  lastObstacleValue = obstacleValue;
  
  sleep();
}


 * Main loop
 */
void loop() {
  digitalWrite(OBSTACLE_BATTERY, 255);
  digitalWrite(BUZZER_BATTERY, 255);
  int obstacleValue = digitalRead(OBSTACLE_SENSOR);
  
  if (lastObstacleValue == HIGH && obstacleValue == LOW) {
