#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <LiquidCrystal_I2C.h>
#include <ESP32Servo.h>

#define DHT_PIN         4   // Connect DHT22 to ESP32 GPIO 4
#define LDR_PIN         34  // Connect LDR to ESP32 GPIO 34
#define YELLOW_LED_PIN  32  // Connect Yellow LED to ESP32 GPIO 32
#define RELAY_PIN       16  // Connect Relay to ESP32 GPIO 16
#define SERVO_PIN       23  // Connect Servo to ESP32 GPIO 23

#define I2C_ADDR        0x27
#define LCD_COLUMNS     20
#define LCD_ROWS        4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_ROWS);
DHT dht(DHT_PIN, DHT22);
Servo myservo;

void setup() {
  Serial.begin(115200);
  lcd.begin(LCD_COLUMNS, LCD_ROWS);
  dht.begin();
  myservo.attach(SERVO_PIN);
  pinMode(YELLOW_LED_PIN, OUTPUT);
  pinMode(RELAY_PIN, OUTPUT);
}

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  int ldrValue = analogRead(LDR_PIN);

  // Display temperature and humidity on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: " + String(temperature) + "C");
  lcd.setCursor(0, 1);
  lcd.print("Humidity: " + String(humidity) + "%");

  // Check temperature conditions for the fan (servo)
  if (temperature > 40) {
    myservo.write(360);  // Turn on the fan
  } else {
    myservo.write(0);   // Turn off the fan
  }

  // Check light conditions for the yellow LED
  if (ldrValue > 1000) {
    digitalWrite(YELLOW_LED_PIN, HIGH);  // Turn on the yellow LED
  } else {
    digitalWrite(YELLOW_LED_PIN, LOW);   // Turn off the yellow LED
  }

  // Check humidity conditions for the relay and red LED
  if (humidity > 50 || humidity < 20) {
    digitalWrite(RELAY_PIN, HIGH);  // Turn on the relay
  } else {
    digitalWrite(RELAY_PIN, LOW);   // Turn off the relay
  }

  delay(1000);  // Delay for stability
}