/* How to use DHT-11 sensor with Arduino uno
   Temperature and humidity sensor
   Dev: Michalis Vasilakis // Date: 1/7/2015 // www.ardumotive.com */

//Libraries
#include <DHT.h>

#include <LiquidCrystal_I2C.h>

#define LDR_PIN 2
const float GAMMA = 0.7;
const float RL10 = 50;

LiquidCrystal_I2C lcd(0x27, 20, 4);

//Constants
#define DHTPIN 2     // what pin we're connected to
#define DHTTYPE DHT11   // DHT 11  (AM2302)
// Initialize DHT sensor for normal 16mhz Arduino
DHT dht(DHTPIN, DHTTYPE);

//Variables
int led=13;
int chk;
float hum;  //Stores humidity value
float temp; //Stores temperature value

void setup()
{
    Serial.begin(9600);
	dht.begin();
  pinMode(led, OUTPUT);
  pinMode(LDR_PIN, INPUT);


    
}

void loop()
{
    //Read data and store it to variables hum and temp
    hum = dht.readHumidity();
    temp= dht.readTemperature();
    //Print temp and humidity values to serial monitor
    Serial.print("Humidity: ");
    Serial.print(hum);
    Serial.print(" %, Temp: ");
    Serial.print(temp);
    Serial.println(" Celsius");
    digitalWrite(led, LOW);
    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));
   if (lux <= 50){
    digitalWrite(led, HIGH);
    Serial.print("");
    Serial.print(" DARK");
    Serial.print("");
   }
   else{
    digitalWrite(led, LOW);
    Serial.print("");
    Serial.print(" LIGHT");
    Serial.print("");
   }
   if (temp>2, hum<20)
    {
      digitalWrite(led, LOW);
      Serial.print("");
      Serial.print(" HOT CLIMATE");
      Serial.print("");
    }
   if (temp<2, hum>20)
    {
      digitalWrite(led, HIGH);
      Serial.print("");
      Serial.print(" HUMID CLIMATE");
      Serial.print("");
    }
    else{
      digitalWrite(led, LOW);
    }
     
    delay(10000);
}