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

// Define Pins
#define DHTPIN 2
#define DHTTYPE DHT22
#define LDR_PIN 3
#define SOIL_MOISTURE_PIN A0
#define RELAY_PIN 4

// LCD setup (address 0x27, 16 chars, 2 lines)
LiquidCrystal_I2C lcd(0x27, 16, 2);
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
    
      dht.begin();
        lcd.init();
          lcd.backlight();
            
              pinMode(LDR_PIN, INPUT);
                pinMode(RELAY_PIN, OUTPUT);
                  
                    lcd.setCursor(0, 0);
                      lcd.print("Smart Irrigation");
                        delay(2000);
                          lcd.clear();
                          }

                          void loop() {
                            float temp = dht.readTemperature();
                              float humidity = dht.readHumidity();
                                int soilValue = analogRead(SOIL_MOISTURE_PIN); // 0-1023
                                  bool isDay = digitalRead(LDR_PIN); // 0 = Dark, 1 = Light

                                    // Display on LCD
                                      lcd.setCursor(0, 0);
                                        lcd.print("T:");
                                          lcd.print(temp, 1);
                                            lcd.print("C H:");
                                              lcd.print(humidity, 0);
                                                lcd.print("%");

                                                  lcd.setCursor(0, 1);
                                                    lcd.print("Soil:");
                                                      lcd.print(soilValue);
                                                        lcd.print(isDay ? " Day " : " Night");

                                                          // Control Relay
                                                            if (soilValue > 600) { // Adjust threshold as needed
                                                                digitalWrite(RELAY_PIN, HIGH); // Turn ON water pump
                                                                  } else {
                                                                      digitalWrite(RELAY_PIN, LOW); // Turn OFF water pump
                                                                        }

                                                                          // Debug Output
                                                                            Serial.print("Temp: "); Serial.print(temp);
                                                                              Serial.print(" °C, Hum: "); Serial.print(humidity);
                                                                                Serial.print(" %, Soil: "); Serial.print(soilValue);
                                                                                  Serial.print(", Light: "); Serial.println(isDay ? "Day" : "Night");

                                                                                    delay(2000);
                                                                                    }