int trigPin = 10;
int echoPin = 11;
int tim;
int distance ;
void setup() {
  // put your setup code here, to run once:
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  tim = pulseIn(echoPin, HIGH);
  distance = 0.034 * tim / 2  ;
  Serial.println(distance);

}