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

// Mendefinisikan variabel
#define DHTPIN 2
#define DHTTYPE DHT22

#define TRIGGER_PIN 3
#define ECHO_PIN 4

#define PHOTOCELL_PIN A0
#define RELAY_PIN 7

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  pinMode(TRIGGER_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(RELAY_PIN, OUTPUT);

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

  dht.begin();
  Serial.begin(9600);
}

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  float distance = getDistance();

  float lightValue = analogRead(PHOTOCELL_PIN);

  // Menampilkan nilai dari sensor ke LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");
  lcd.setCursor(0, 1);
  lcd.print("Humid: ");
  lcd.print(humidity);
  lcd.print(" %");

  // Menghidupkan atau mematikan relay berdasarkan nilai dari photoresistor
  if (lightValue > 500) {
    digitalWrite(RELAY_PIN, HIGH);
  } else {
    digitalWrite(RELAY_PIN, LOW);
  }

  // println(temperature)
  // println(humidity) 
  // println(distance)
  // println(lightValue)
  
  delay(2000);
}

float getDistance() {
  digitalWrite(TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER_PIN, LOW);
  float duration = pulseIn(ECHO_PIN, HIGH);
  float distance = (duration * 0.034) / 2;
  return distance;
}