#define TRIG_PIN 12
#define ECHO_PIN 14
#define LED_PIN 23
#define BUZZER_PIN 18

long duration;
float distance;

void setup() {
  Serial.begin(115200);
  
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
}

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

  // Baca pantulan
  duration = pulseIn(ECHO_PIN, HIGH);

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

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

  // LOGIC SENSOR PARKIR
  if (distance > 50) {
    // Aman
    digitalWrite(LED_PIN, LOW);
    noTone(BUZZER_PIN);
  }
  else if (distance > 20) {
    // Waspada
    digitalWrite(LED_PIN, HIGH);
    // delay(5000);
    tone(BUZZER_PIN, 1000);
    delay(500);
    noTone(BUZZER_PIN);
    delay(500);
  }
  else {
    // Bahaya
    digitalWrite(LED_PIN, HIGH);
    // delay(1000);
    tone(BUZZER_PIN, 2000);
    delay(100);
    noTone(BUZZER_PIN);
    delay(100);
  }

  delay(100);
}