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

#define LDR_DIG 2
#define LDR_ANA A3
#define DHT_PIN 8
#define Estufa 3
#define Ventilador 4
#define Luces 5

// LDR Characteristics
const float GAMMA = 0.7;
const float RL10 = 50;

//LCD I2C, Puerto, Tamaño
LiquidCrystal_I2C lcd(0x27, 20, 4);

// Uncomment whatever type you're using!
//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)
DHT dht(DHT_PIN, DHTTYPE);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.println(F("DHTxx test!"));
  dht.begin();
  
  pinMode(LDR_DIG, INPUT);
  pinMode(Ventilador, OUTPUT);
  pinMode(Estufa, OUTPUT);
  pinMode(Luces, OUTPUT);
  
  lcd.init();
  lcd.backlight();
}

void loop() {
  // put your main code here, to run repeatedly:
  int analogValue = analogRead(LDR_ANA);
  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  ");
//  }

  lcd.setCursor(0, 1);
  lcd.print("L:");
  lcd.print(lux);
  //lcd.print("          ");
  if (lux > 50) {
    lcd.print(" Luz Off ");
    digitalWrite(13,LOW);
    digitalWrite(Luces,LOW);
  } else {
    lcd.print(" Luz On   ");
    digitalWrite(13,HIGH);
    digitalWrite(Luces,HIGH);
  }

  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  float f = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  // Compute heat index in Fahrenheit (the default)
  float hif = dht.computeHeatIndex(f, h);
  // Compute heat index in Celsius (isFahreheit = false)
  float hic = dht.computeHeatIndex(t, h, false);

  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.print(F("°F  Heat index: "));
  Serial.print(hic);
  Serial.print(F("°C "));
  Serial.print(hif);
  Serial.println(F("°F"));
  lcd.setCursor(0, 0);
  lcd.print("T");
  lcd.print(t);
  lcd.print((char)223);
  lcd.print("C H");
  lcd.print(h);
  lcd.print(F("%"));
  if (t<16){
    digitalWrite(Estufa,HIGH);
    }
    else{
      digitalWrite(Estufa,LOW);
    }
  if (t>29){
    digitalWrite(Ventilador,HIGH);
    }
    else{
      digitalWrite(Ventilador,LOW);
    }
    
  delay(100);

}