int trigPin = 11;
int echoPin = 12;

long duration, distance;

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

void loop() {
  // turning on and off the transmitter
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);

//measuring the distance
duration = pulseIn(echoPin, HIGH);
distance = duration*0.034/2;

//displaying distance
Serial.print("distance: ");
Serial.println(distance);

}