int trigPin = 12;
int echoPin = 11;
int pingTravelTime;

void setup() {
  // put your setup code here, to run once:
  pinMode(echoPin, INPUT);
  pinMode(trigPin, OUTPUT);
  Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trigPin, LOW);
  delayMicroseconds(10);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  pingTravelTime=pulseIn(echoPin,HIGH);
  delay(25);
  Serial.println(pingTravelTime); 

}