#define ECHO_PIN 2
#define TRIG_PIN 3


void setup() {
  Serial.begin(115200);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

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

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