#define TRIG_PIN 19
#define ECHO_PIN 18

void setup() {
  Serial.begin(115200);

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void loop() {
  long duration;
  float distance;

  // Envoi d'une impulsion TRIG
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);

  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  // Lecture ECHO (durée en microsecondes)
  duration = pulseIn(ECHO_PIN, HIGH);

  // Calcul de la distance en cm
  distance = duration * 0.0343 / 2;
  distance = distance*(1-0.0086);

  Serial.print("Distance : ");
  Serial.print(distance);
  Serial.println(" cm");

}