int sensorsPins[NUMBER_OF_SENSORS] = {2, 11, 12, A0, A1, A2, A3}; //define the pins for the sensors

loop ()
{

  // Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  duration = pulseIn(sensorsPins[currentSensor], HIGH, 4000);
	
 currentSensor = (currentSensor+1)%7;
delay(1000)
}