const int trigPin = 9;
const int echoPin = 10;
const int buzzerPin = 8;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  long duration, distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2; // Conversion en cm

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

  // Contrôle du buzzer
  if (distance <= 15) { // Si objet à moins de 5 cm
    int frequency = map(distance, 0, 100, 2000, 5000); // Plus aigu quand plus proche
    tone(buzzerPin, frequency, 100);
    delay(distance * 10); // Bips plus rapprochés si proche
  } else {
    noTone(buzzerPin);
  }
  
  if (distance >= 10 && distance <= 15) digitalWrite(3, HIGH); else digitalWrite(3, LOW);
  if (distance >= 5 && distance <= 9) digitalWrite(6, HIGH); else digitalWrite(6, LOW);
  if (distance < 5) digitalWrite(7, HIGH); else digitalWrite(7, LOW);

}