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

#define ONE_WIRE_BUS 3 // Pin data sensor suhu DS18B20
#define I2C_ADDR 0x27 // Alamat I2C LCD 16x2
#define LED_PIN_RED 2 // Pin LED merah untuk suhu tinggi
#define LED_PIN_GREEN 5 // Pin LED hijau untuk suhu rendah
#define BUZZER_PIN 4 // Pin buzzer

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
LiquidCrystal_I2C lcd(I2C_ADDR, 16, 2);

void setup() {
  sensors.begin();
  pinMode(LED_PIN_RED, OUTPUT);
  pinMode(LED_PIN_GREEN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  lcd.init();
  lcd.backlight();
  lcd.begin(16, 2);
  lcd.clear();
}

void loop() {
  sensors.requestTemperatures();
  float suhu = sensors.getTempCByIndex(0);

  lcd.setCursor(0, 0);
  lcd.print("Suhu: ");
  lcd.print(suhu);
  lcd.print(" C");

  delay(1000);

  // Kontrol LED dan buzzer
  if (suhu > 30) {
    digitalWrite(LED_PIN_RED, HIGH);
    digitalWrite(LED_PIN_GREEN, LOW);
    tone(BUZZER_PIN, 1000);
  } else if (suhu < 30) {
    digitalWrite(LED_PIN_RED, LOW);
    digitalWrite(LED_PIN_GREEN, HIGH);
    tone(BUZZER_PIN, 1000);
  } else { // Suhu tepat 30°C
    digitalWrite(LED_PIN_RED, LOW);
    digitalWrite(LED_PIN_GREEN, LOW);
    noTone(BUZZER_PIN);
  }
}