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

#define DHTPIN 2  // Pin connected to DHT22 data pin
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

// Initialize the LCD I2C address (0x27 or 0x3F)
LiquidCrystal_I2C lcd(0x27, 20, 4); // LCD 20x4

#define RELAY_PIN_COOLING 3
#define RELAY_PIN_HUMIDIFIER 4
#define RELAY_PIN_PH_CONTROL 5

#define PH_PIN A0  // Potentiometer connected to analog pin A0

void setup() {
  Serial.begin(9600);
  dht.begin();
  
  lcd.init();          // Initialize the LCD
  lcd.backlight();      // Turn on the backlight
  
  pinMode(RELAY_PIN_COOLING, OUTPUT);
  pinMode(RELAY_PIN_HUMIDIFIER, OUTPUT);
  pinMode(RELAY_PIN_PH_CONTROL, OUTPUT);
  
  pinMode(PH_PIN, INPUT);
  
  // Display static text on LCD for labels
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.setCursor(0, 2);
  lcd.print("pH Level: ");
}

void loop() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  
  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.println(" *C");
  
  // Update LCD with temperature and humidity values
  lcd.setCursor(6, 0);  // Set cursor to display temperature
  lcd.print(t);
  lcd.print(" C ");
  
  lcd.setCursor(10, 1);  // Set cursor to display humidity
  lcd.print(h);
  lcd.print(" %  ");
  
  // Control Cooling
  if (t > 30) {
    digitalWrite(RELAY_PIN_COOLING, HIGH); // Turn on cooling fan (simulate with LED)
  } else {
    digitalWrite(RELAY_PIN_COOLING, LOW);  // Turn off cooling fan
  }

  // Control Humidifier
  if (h < 50) {
    digitalWrite(RELAY_PIN_HUMIDIFIER, HIGH); // Turn on humidifier (simulate with LED)
  } else {
    digitalWrite(RELAY_PIN_HUMIDIFIER, LOW);  // Turn off humidifier
  }
  
  // Control pH (Simulated with potentiometer)
  int phValue = analogRead(PH_PIN);
  float phLevel = map(phValue, 0, 1023, 0, 14); // Simulate pH from 0 to 14
  
  Serial.print("pH Level: ");
  Serial.println(phLevel);
  
  // Update LCD with pH value
  lcd.setCursor(10, 2);  // Set cursor to display pH level
  lcd.print(phLevel);
  lcd.print("   ");
  
  if (phLevel < 3.5 || phLevel > 7.5) {
    digitalWrite(RELAY_PIN_PH_CONTROL, HIGH); // Adjust pH with dosing pump (simulate with LED)
  } else {
    digitalWrite(RELAY_PIN_PH_CONTROL, LOW);  // Turn off dosing pump
  }
  
  delay(2000); // Wait for 2 seconds before refreshing
}