// Pin definisi
const int trigPin = 9;
const int echoPin = 10;
const int ledPin = 7;
const int ledPin0 = 6;
const int ledPin1 = 5;
const int buzzerPin = 8;

// Variabel jarak
long duration;
int distance;

void setup() {
  // Inisialisasi pin
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);

  // Inisialisasi Serial Monitor
  Serial.begin(9600);
}

void buzzer0 () {
  digitalWrite(buzzerPin, HIGH);
  delay(200);
  digitalWrite(buzzerPin, LOW);
}
void buzzer1 () {
  digitalWrite(buzzerPin, HIGH);
  delay(1000);
  digitalWrite(buzzerPin, LOW);
  }

void loop() {
  // Mengirimkan sinyal ultrasonik
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Membaca durasi pantulan sinyal
  duration = pulseIn(echoPin, HIGH);

  // Menghitung jarak (dalam cm)
  distance = duration * 0.034 / 2;

  // Menampilkan jarak di Serial Monitor
  Serial.print("Jarak: ");
  Serial.print(distance);
  Serial.println(" cm");

  // Logika LED dan Buzzer
  if (distance > 0 && distance <= 100) { // Jika objek dalam jarak <= 20 cm
    digitalWrite(ledPin, HIGH);        // LED menyala
    buzzer0();     // Buzzer berbunyi
  } else {
    digitalWrite(ledPin, LOW);         // LED mati
        // Buzzer mati
  }

  delay(100); // Delay untuk stabilisasi pembacaan

   if (distance > 100 && distance <= 200) { // Jika objek dalam jarak <= 20 cm
    digitalWrite(ledPin0, HIGH);       // LED menyala
    buzzer1();// Buzzer berbunyi
  } else {
    digitalWrite(ledPin0, LOW);         // LED mati
        // Buzzer mati
  }

  delay (100);
if (distance > 200 && distance <= 380) { // Jika objek dalam jarak <= 20 cm
    digitalWrite(ledPin1, HIGH);       // LED menyala
        // Buzzer berbunyi
  } else {
    digitalWrite(ledPin1, LOW);         // LED mati
          // Buzzer mati
  }

  delay (100);

}