const int trigPin = 11;
const int echoPin = 10;
const int ledPins[] = {2, 3, 4, 5, 6, 7, 8, 9, 12, 13}; // 10 LEDs

void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  for (int i = 0; i < 10; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
}

void loop() {
  // Envoi du signal
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Réception et calcul de distance
  long duration = pulseIn(echoPin, HIGH);
  int distance = duration * 0.034 / 2;

  // Affichage bar graph LED
  int ledsOn = constrain(distance / 10, 0, 10);
  for (int i = 0; i < 10; i++) {
    digitalWrite(ledPins[i], i < ledsOn ? HIGH : LOW);

  }

  delay(200);
}