#include <Wire.h>
#include <LiquidCrystal_I2C.h>

const int ledMerahPin = 2;
const int ledKuningPin = 3;
const int ledHijauPin = 4;
const int buzzerPin = 5;
const int trigPin = 6;
const int echoPin = 7;
const int pirPin = 8;

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  pinMode(ledMerahPin, OUTPUT);
  pinMode(ledKuningPin, OUTPUT);
  pinMode(ledHijauPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(pirPin, INPUT);

  lcd.begin(16, 2);
  lcd.print("Sistem Pendeteksi");
  lcd.setCursor(0, 1);
  lcd.print("Gempa & Tsunami");
  delay(1000);
  lcd.clear();
}

void loop() {
  long duration, distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  int pirValue = digitalRead(pirPin);

  if (pirValue == HIGH) {
    lcd.setCursor(0, 0);
    lcd.print("Status: Gempa!");
    digitalWrite(ledMerahPin, HIGH);
    digitalWrite(ledKuningPin, LOW);
    digitalWrite(ledHijauPin, LOW);
    tone(buzzerPin, 1000);
  } else {
    noTone(buzzerPin);

    if (distance > 300) {
      lcd.setCursor(0, 0);
      lcd.print("Status: Bahaya");
      digitalWrite(ledMerahPin, HIGH);
      digitalWrite(ledKuningPin, LOW);
      digitalWrite(ledHijauPin, LOW);
      tone(buzzerPin, 1000);  
    } else if (distance >= 50 && distance <= 300) {
      lcd.setCursor(0, 0);
      lcd.print("Status: Siaga");
      digitalWrite(ledMerahPin, LOW);
      digitalWrite(ledKuningPin, HIGH);
      digitalWrite(ledHijauPin, LOW);
      slowBuzzer();  
    } else {
      lcd.setCursor(0, 0);
      lcd.print("Status: Waspada");
      digitalWrite(ledMerahPin, LOW);
      digitalWrite(ledKuningPin, LOW);
      digitalWrite(ledHijauPin, HIGH);
      noTone(buzzerPin); 
    }
  }

  lcd.setCursor(0, 1);
  lcd.print("Tinggi: ");
  lcd.print(distance);
  lcd.print(" cm");
  delay(1000);
  lcd.clear();
}

void slowBuzzer() {
  for (int i = 0; i < 3; i++) {
    tone(buzzerPin, 500); 
    delay(500);
    noTone(buzzerPin);
    delay(1000); 
  }
}