/* How to use the DHT-22 sensor with Arduino uno
   Temperature and humidity sensor
   More info: http://www.ardumotive.com/how-to-use-dht-22-sensor-en.html
   Dev: Michalis Vasilakis // Date: 1/7/2015 // www.ardumotive.com 
*/

//Libraries
#include <DHT.h>
#include <Wire.h> 
//#include <lcd.h>
#include <LiquidCrystal_I2C.h>

//Constants
#define DHTPIN 7 // what pin the DHT22 Data is connected to
#define DHTTYPE DHT22   // DHT 22  (AM2302)
DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal 16mhz Arduino

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows

//Variables
int chk;
float hum;  //Stores humidity value
float tempC; //Stores temperature value Celcius
float tempF; //Stores temperature value Farenheit
void setup(){
  lcd.init(); // initialize the lcd
  lcd.backlight();

  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);

  lcd.setCursor(0, 0);         // move cursor to   (0, 0)
  lcd.print("Arduino");        // print message at (0, 0)
  lcd.setCursor(1, 1);         // move cursor to   (1, 1)
  lcd.print("Salman");  // print message at (1, 1)
  Serial.begin(9600);
  dht.begin();
  lcd.begin(16,2);
  lcd.init(); // initialize the lcd
  lcd.backlight();
}

void loop(){
  delay(500);
  //Read data and store it to variables hum and temp
  hum = dht.readHumidity();
  tempC = dht.readTemperature();
  //tempF = ((tempC * 1.8) + 32); //if you want to farenheit
  //Print temp and humidity values to serial monitor
  Serial.print("Humidity: ");
  Serial.print(hum);
  Serial.print(" %, Temp: ");
  Serial.print(tempC);
  Serial.println(" Celsius");
  //Print temp and humidity values to LCD
  lcd.setCursor(0,0);
  lcd.print("Humidity: ");
  lcd.print(hum);
  lcd.print("%");
  lcd.setCursor(0,1);
  lcd.print("Temp: "); 
  lcd.print(tempC);
  lcd.println(" C");

  if(tempC > 30){
    digitalWrite(11, LOW);
    digitalWrite(12, LOW);
    digitalWrite(13, HIGH);
  }
  if(tempC > 15){
    digitalWrite(11, LOW);
    digitalWrite(12, HIGH);
    digitalWrite(13, LOW);
  }
  if(tempC <=15){
    digitalWrite(11, HIGH);
    digitalWrite(12, LOW);
    digitalWrite(13, LOW);
  }

  //delay(2000); //Delay 2 sec between temperature/humidity check
}