#include <Wire.h>

#include <LiquidCrystal_I2C.h>

#include <DHT.h>

#define DHTPIN 2

#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

#define RELAY_1 3

#define RELAY_2 4

#define RELAY_3 5

#define RELAY_4 6

#define BUTTON_TEMP_UP 7

#define BUTTON_TEMP_DOWN 8

#define BUTTON_HUMID_UP 9

#define BUTTON_HUMID_DOWN 10

LiquidCrystal_I2C lcd(0x27, 16, 2); // Change 0x27 to your I2C address

float setTemperature = 38.0; // Default set temperature

float setHumidity = 50.0;    // Default set humidity

void setup() {

  Serial.begin(9600);

  dht.begin();

  pinMode(RELAY_1, OUTPUT);

  pinMode(RELAY_2, OUTPUT);

  pinMode(RELAY_3, OUTPUT);

  pinMode(RELAY_4, OUTPUT);

  pinMode(BUTTON_TEMP_UP, INPUT_PULLUP);

  pinMode(BUTTON_TEMP_DOWN, INPUT_PULLUP);

  pinMode(BUTTON_HUMID_UP, INPUT_PULLUP);

  pinMode(BUTTON_HUMID_DOWN, INPUT_PULLUP);

  lcd.begin(16, 2);

  lcd.backlight();

  lcd.setCursor(0, 0);

  lcd.print("Temp: ");

  lcd.setCursor(0, 1);

  lcd.print("Humidity: ");

}

void loop() {

  float humidity = dht.readHumidity();

  float temperature = dht.readTemperature();

  lcd.setCursor(6, 0);

  lcd.print(temperature);

  lcd.print(" C   ");

  lcd.setCursor(9, 1);

  lcd.print(humidity);

  lcd.print(" %   ");

  if (digitalRead(BUTTON_TEMP_UP) == LOW) {

    setTemperature++;

    delay(500);

  }

  if (digitalRead(BUTTON_TEMP_DOWN) == LOW) {

    setTemperature--;

    delay(500);

  }

  if (digitalRead(BUTTON_HUMID_UP) == LOW) {

    setHumidity++;

    delay(500);

  }

  if (digitalRead(BUTTON_HUMID_DOWN) == LOW) {

    setHumidity--;

    delay(500);

  }

  // Control relays based on conditions (e.g., turn on heating or cooling)
  if (temperature < setTemperature) {

    digitalWrite(RELAY_1, HIGH);

    digitalWrite(RELAY_2, LOW);

  } else {

    digitalWrite(RELAY_1, LOW);

    digitalWrite(RELAY_2, HIGH);

  }

  if (humidity < setHumidity) {

    digitalWrite(RELAY_3, HIGH);

    digitalWrite(RELAY_4, LOW);

  } else {
    
    digitalWrite(RELAY_3, LOW);

    digitalWrite(RELAY_4, HIGH);

  }
  
}