#define TRIG_PIN A0  
#define ECHO_PIN A1  
#define LED_ROUGE A2  
#define LED_ORANGE A3 
#define LED_VERTE A4  
#define BUZZER A5    

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(BUZZER, OUTPUT);
}

void loop() {
   digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  long duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2;

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


  tone(BUZZER, 262, 250);

  if (distance > 120) {   
    digitalWrite(LED_VERTE, HIGH);
    digitalWrite(LED_ORANGE, LOW);
    digitalWrite(LED_ROUGE, LOW);
    noTone(BUZZER);
  } 
  else if (distance > 30 && distance <= 120) {   
    digitalWrite(LED_VERTE, LOW);
    digitalWrite(LED_ORANGE, HIGH);
    digitalWrite(LED_ROUGE, LOW);
    noTone(BUZZER); 
  } 
  else {    
    digitalWrite(LED_VERTE, LOW);
    digitalWrite(LED_ORANGE, LOW);
    digitalWrite(LED_ROUGE, HIGH);
    tone(BUZZER, 1000);
  }

  delay(500);


  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}