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

// DHT22 setup
#define DHTPIN 4        // GPIO pin connected to DHT22 data
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// Soil Moisture Sensor
#define SOIL_PIN 34     // Analog pin

// Relay pins
#define FAN_RELAY 26
#define PUMP_RELAY 27

// LED pin
#define LED_PIN 2

// LCD setup (I2C address might be 0x27 or 0x3F)
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(115200);

  // Initialize sensors
  dht.begin();

  // LCD
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Smart Farming");

  // Relay and LED pins
  pinMode(FAN_RELAY, OUTPUT);
  pinMode(PUMP_RELAY, OUTPUT);
  pinMode(LED_PIN, OUTPUT);

  // Default OFF
  digitalWrite(FAN_RELAY, HIGH);  // relay module is active LOW
  digitalWrite(PUMP_RELAY, HIGH);
  digitalWrite(LED_PIN, LOW);

  delay(2000);
}

void loop() {
  // Read sensors
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();
  int soilValue = analogRead(SOIL_PIN);
  int soilPercent = map(soilValue, 4095, 0, 0, 100); // Convert to percentage

  // Print to serial
  Serial.print("Temp: "); Serial.print(temp); Serial.println("C");
  Serial.print("Humidity: "); Serial.print(hum); Serial.println("%");
  Serial.print("Soil: "); Serial.print(soilPercent); Serial.println("%");

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

  lcd.setCursor(0,1);
  lcd.print("Soil:");
  lcd.print(soilPercent);
  lcd.print("%");

  // Control FAN (based on temperature)
  if (temp > 30) {
    digitalWrite(FAN_RELAY, LOW);  // Turn ON
  } else {
    digitalWrite(FAN_RELAY, HIGH); // Turn OFF
  }

  // Control PUMP (based on soil moisture)
  if (soilPercent < 40) {   // Dry soil
    digitalWrite(PUMP_RELAY, LOW);  // Turn ON
    digitalWrite(LED_PIN, HIGH);    // LED ON when watering
  } else {
    digitalWrite(PUMP_RELAY, HIGH); // Turn OFF
    digitalWrite(LED_PIN, LOW);
  }

  delay(2000);  // update every 2 sec
}