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

#define DHTPIN 4 
#define DHT_TYPE DHT22 
#define LDR_PIN 34 
#define POT_PIN 35 
#define LED_PIN 23 
#define SDA_PIN 21 
#define SCL_PIN 22 

DHT dht(DHTPIN, DHT_TYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2); 

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

  lcd.init();
  lcd.begin(16, 2);
  lcd.backlight();

  lcd.setCursor(0, 0);
  lcd.print("Greenhouse Sys");
  lcd.setCursor(0, 1);
  lcd.print("Initializing...");
  delay(2000);
  lcd.clear();

  dht.begin();

  // Set up pins
  pinMode(LDR_PIN, INPUT);
  pinMode(POT_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);

  Serial.println("Setup complete");
}

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error!");
    delay(2000);
    return;
  }

  int ldrValue = analogRead(LDR_PIN);
  int potValue = analogRead(POT_PIN);

  float lightIntensity = (ldrValue * 100.0) / 1023.0; 
  float soilMoisture = (potValue * 100.0) / 1023.0; 

  lcd.clear(); 
  lcd.setCursor(0, 0);
  lcd.print("Temp:");
  lcd.print(temperature, 1); 
  lcd.print(" C");

  lcd.setCursor(0, 1);
  lcd.print("Hum:");
  lcd.print(humidity, 1); 
  lcd.print(" %");

  lcd.setCursor(8, 0);
  lcd.print("Light:");
  lcd.print(lightIntensity, 1); 
  lcd.print("%");

  lcd.setCursor(8, 1);
  lcd.print("Soil:");
  lcd.print(soilMoisture, 1); 
  lcd.print(" %");

  Serial.print("LDR Value: ");
  Serial.println(ldrValue);
  Serial.print("Potentiometer Value: ");
  Serial.println(potValue);

  if (soilMoisture < 200) { 
    digitalWrite(LED_PIN, HIGH); 
    Serial.println("LED ON");
  } else {
    digitalWrite(LED_PIN, LOW); 
    Serial.println("LED OFF");
  }

  delay(2000);
}