#define TRIG_PIN D5  
#define ECHO_PIN D4   
#define LED_VERTE A7   
#define LED_ORANGE A3 
#define LED_ROUGE A2 
#define INTERRUPTEUR A1  
#define BUZZER D6  // New buzzer pin

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

    pinMode(TRIG_PIN, OUTPUT);
    pinMode(ECHO_PIN, INPUT);
    pinMode(LED_VERTE, OUTPUT);
    pinMode(LED_ORANGE, OUTPUT);
    pinMode(LED_ROUGE, OUTPUT);
    pinMode(INTERRUPTEUR, INPUT_PULLUP); 
    pinMode(BUZZER, OUTPUT); // Set buzzer as output

    digitalWrite(LED_VERTE, LOW);
    digitalWrite(LED_ORANGE, LOW);
    digitalWrite(LED_ROUGE, LOW);
    digitalWrite(BUZZER, LOW);
}

void loop() {
    bool etatInterrupteur = digitalRead(INTERRUPTEUR); 
    
    if (etatInterrupteur == HIGH) {  
        Serial.println("🛑 Interrupteur OFF - Système désactivé");
        
        digitalWrite(LED_VERTE, LOW);
        digitalWrite(LED_ORANGE, LOW);
        digitalWrite(LED_ROUGE, LOW);
        digitalWrite(BUZZER, LOW); // Turn off buzzer
        
        delay(500);
        return; 
    }

    Serial.println("✅ Interrupteur ON - Système activé");

    long duration;
    float distance;
    
    digitalWrite(TRIG_PIN, LOW);
    delayMicroseconds(2);
    digitalWrite(TRIG_PIN, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG_PIN, LOW);

    duration = pulseIn(ECHO_PIN, HIGH, 60000); 

    if (duration == 0) {
        Serial.println("⚠️ Pas de signal reçu ! Vérifiez le capteur.");
        return;
    }

    distance = duration * 0.034 / 2;

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

    digitalWrite(LED_VERTE, LOW);
    digitalWrite(LED_ORANGE, LOW);
    digitalWrite(LED_ROUGE, LOW);
    digitalWrite(BUZZER, LOW);  // Ensure buzzer is OFF initially

    if (distance > 120) {  
        digitalWrite(LED_VERTE, HIGH);
        Serial.println("🟢 Tout est clair. Distance sécurisée.");
    } 
    else if (distance >= 30 && distance <= 120) {  
        digitalWrite(LED_ORANGE, HIGH);
        Serial.println("🟠 Attention ! Objet détecté.");
    } 
    else {  
        Serial.println("🔴 DANGER ! 🚨 Objet trop proche !");
        
        for (int i = 0; i < 3; i++) { // Clignotement 3 fois
            digitalWrite(LED_ROUGE, HIGH);
            digitalWrite(BUZZER, HIGH);  // Turn on buzzer
            delay(200);
            digitalWrite(LED_ROUGE, LOW);
            digitalWrite(BUZZER, LOW);  // Turn off buzzer
            delay(200);
        }
        digitalWrite(LED_ROUGE, HIGH); // Keep LED ON after blinking
        digitalWrite(BUZZER, HIGH); // Keep buzzer ON
    }

    delay(500); 
}