#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h> // Include the library for the DHT sensor

// Define constants for the DHT sensor
#define DHTPIN 15       // DHT22 sensor is connected to GPIO 15
#define DHTTYPE DHT22   // DHT22 type
#define RELAY_PIN 12    // Relay control pin (change to your desired GPIO pin)

DHT dht(DHTPIN, DHTTYPE); // Initialize DHT sensor
LiquidCrystal_I2C lcd(0x27, 12, 3);

const int ledPin = 13; // LED pin

void setup() {
  Wire.begin(23, 22); // Initialize the I2C communication with SDA pin 23 and SCL pin 22.
  Serial.begin(9600); // Initialize the serial communication at a baud rate of 9600 bits per second.
  lcd.init();         // Initialize the LCD
  lcd.backlight();    // Turn on the backlight
  pinMode(ledPin, OUTPUT); // Set LED pin as output
  pinMode(RELAY_PIN, OUTPUT); // Set relay pin as output
  dht.begin(); // Initialize the DHT sensor
}

void loop() {
  float temp = dht.readTemperature(); // Read temperature from DHT22
  float hum = dht.readHumidity();     // Read humidity from DHT22

  int soilMoisture = analogRead(34); // Read soil moisture value from pin 34

  // Use the ternary operator to determine the moisture status based on the value of 'soilMoisture'.
  String msg = soilMoisture < 300 ? "DRY" : soilMoisture > 600 ? "WET" : "OK";

  lcd.clear();
  lcd.print("Moist:");
  lcd.print(soilMoisture, 1); // Print soil moisture with one decimal

  lcd.print(": ");
  lcd.print(msg);

  // Control the relay based on soil moisture level
  if (soilMoisture <= 300) {
    digitalWrite(ledPin, HIGH); // Turn on the LED (motor) if the soil is dry (i < 300)
    digitalWrite(RELAY_PIN, HIGH); // Activate the relay (turn on irrigation)
  } else {
    digitalWrite(ledPin, LOW); // Turn off the LED (motor)
    digitalWrite(RELAY_PIN, LOW); // Deactivate the relay (turn off irrigation)
  }

  lcd.setCursor(0, 1); // Set cursor to the first column and second row
  lcd.print("T:"); // Print "T:" (Temperature)
  lcd.print(temp); // Print temperature with one decimal
  lcd.print(" H:"); // Print " H:" (Humidity)
  lcd.print(hum); // Print humidity with one decimal

  delay(500); // Delay for half a second
}