int trig = 3;
int echo = 2;

void setup() {
Serial.begin(9600)

pinMode(trig, OUTPUT);
pinMode(echo, INPUT);

}

void loop() {
  digitalWrite(trig, LOW);
  delay(1000);
  digitalWrite(trig, HIGH);
  delay(1000);
  digitalWrite(LOW);

  int duration = pulseIn(echo, HIGH);

  int distance = (duration/2)*(0.034);

  Serial.println(distance);
  Serial.println(" cm");

}