const float SOUND_SPEED = 340.0 / 1000;
const byte TRIGGER_PIN = 2;  
const int ECHO_PIN = 3;     
const unsigned long MEASURE_TIMEOUT = 25000UL; 

void setup() {
  Serial.begin(9600);
  pinMode(TRIGGER_PIN, OUTPUT);
  digitalWrite(TRIGGER_PIN, LOW);
  pinMode(ECHO_PIN, INPUT);
}

void loop() {
    digitalWrite(TRIGGER_PIN, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIGGER_PIN, LOW);
    long measure = pulseIn(ECHO_PIN, HIGH, MEASURE_TIMEOUT);
    float distance_mm = measure / 2.0 * SOUND_SPEED;
    float distance_m = distance_mm / 1000.0; 
    float distance_cm = distance_mm / 10.0;  
    
    Serial.print("Distance en mm: ");
    Serial.println(distance_mm);
    Serial.print("Distance en cm: ");
    Serial.println(distance_cm);
    Serial.print("Distance en m: ");
    Serial.println(distance_m);
    
    delay(3000);
}
Écrire à DSIR 2023