#define trigger 3
#define echo 2

void setup() {
  Serial.begin(115200);
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
}

void loop() {
  // Start a new measurement:
  digitalWrite(trigger, HIGH);
  delay(10);
  digitalWrite(trigger, LOW);

  // Read the result:
  int duration = pulseIn(echo, HIGH);
  Serial.print("Distance in CM: ");
  Serial.println(duration / 58);
  delay(1000);
}