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const int trigPin = 11;  //Trig HC SR04 connectés sur PIN11
const int echoPin = 12;  //Echo HC SR04 connectés sur PIN11
const int Led = 8;       //LED connectée sur PIN8
const int Buzzer = 9;    //Buzzer connecté sur PIN9
int distanceDds = 13;    // Distance début signalement (nombre entier en cm)
int distanceDsc = 4;     // Distance signalement continu (nombre entier en cm)
float duration;
int distance;
unsigned long currentTime = 0;
unsigned long previousTime = 0;
boolean etatSignal;


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

void loop() {
  currentTime = millis();
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;
  Serial.println(distance);
  if (distance <= distanceDds) {
    if (distance < distanceDsc) {
      digitalWrite(Led, HIGH);
      digitalWrite(Buzzer, HIGH);
    }
    else {
      if ((currentTime - previousTime) > distance * 20) {
        previousTime = currentTime;
        etatSignal = !etatSignal;
        digitalWrite(Led, etatSignal);
        digitalWrite(Buzzer, etatSignal);
      }
    }
  }
  else {
    digitalWrite(Led, LOW);
    digitalWrite(Buzzer, LOW);
  }
}