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

#define DHTPIN 2
#define DHTTYPE    DHT22
#define LDR_PIN 2
#define LED 4

const float GAMMA = 0.7;
const float RL10 = 50;

DHT_Unified dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27,20,4); 

int counter = 0;

void setup()
{
  pinMode(LDR_PIN, INPUT);
  lcd.init();                     
  lcd.backlight();
  lcd.setCursor(3,0);
  lcd.print("Green House");
  delay(1000);
  lcd.clear();
  lcd.setCursor(0,11);
  lcd.print(" Temp/Humidity");
  dht.begin();
  sensor_t sensor;
  dht.temperature().getSensor(&sensor);
  dht.humidity().getSensor(&sensor);
}


void loop()
{

  delay(100);

  sensors_event_t event;
  dht.temperature().getEvent(&event);
  if (!isnan(event.temperature)) {
      lcd.setCursor(0,1);
      lcd.print(event.temperature);
      lcd.print(F("\xdf"));
      lcd.print(F("C"));
  }
  dht.humidity().getEvent(&event);
  if (!isnan(event.relative_humidity)) {
      lcd.setCursor(0,2);
      lcd.print(event.relative_humidity);
      lcd.print(F("% Humidity"));
  }

  int analogValue = analogRead(A0);
  float voltage = analogValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));

  lcd.setCursor(2, 0);
  lcd.print("Room: ");
  if (lux > 50) {
    lcd.print("Light!");
  } else {
    lcd.print("Dark  ");
    analogWrite(4, 75); //75 midium lux
  }

  lcd.setCursor(0, 3);
  lcd.print("Lux: ");
  lcd.print(lux);
  lcd.print("          ");

  //dht related actuators..
  

}