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

// Pin untuk DHT22
#define DHTPIN 2
#define DHTTYPE DHT22

// Pin LED
#define LED_MERAH 8
#define LED_HIJAU 7

// Pin Ultrasonik HC-SR04
#define TRIG_PIN 3
#define ECHO_PIN 4

// Inisialisasi DHT22
DHT dht(DHTPIN, DHTTYPE);

// Inisialisasi LCD 20x2
LiquidCrystal_I2C lcd(0x27, 20, 2);

void setup() {
  Serial.begin(9600);
  dht.begin();
  lcd.init();
  lcd.backlight();

  pinMode(LED_MERAH, OUTPUT);
  pinMode(LED_HIJAU, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  lcd.setCursor(0, 0);
  lcd.print("Weather Monitor");
  delay(2000);
  lcd.clear();
}

void loop() {
  // ====== BACA SENSOR DHT22 ======
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  if (isnan(temperature) || isnan(humidity)) {
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error!");
    return;
  }

  // ====== BACA SENSOR ULTRASONIK ======
  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;  // cm

  // ====== TAMPILKAN DATA CUACA DI BARIS 1 ======
  lcd.setCursor(0, 0);
  lcd.print("T:");
  lcd.print(temperature, 1);
  lcd.print("C H:");
  lcd.print(humidity, 0);
  lcd.print("%   "); // spasi untuk hapus sisa char lama

  // ====== CEK KETINGGIAN POHON (BARIS 2) ======
  lcd.setCursor(0, 1);
  if (distance >= 200) {  
    lcd.print("Time to Cut Tree"); // 20 char, isi spasi agar bersih
    digitalWrite(LED_MERAH, HIGH);  // alarm nyala
    digitalWrite(LED_HIJAU, LOW);
  } else {
    lcd.print("TreeDist OK: ");
    lcd.print(distance, 0);
    lcd.print("cm     "); // hapus sisa char
    digitalWrite(LED_MERAH, LOW);
    digitalWrite(LED_HIJAU, HIGH);
  }

  delay(2000);
}