#include <DHT.h>        // standard DHT library
#define DHT1PIN 12      // signal pin for sensor #1
#define DHT2PIN 11      // signal pin for sensor #2
#define DHTTYPE DHT22   // defining the sensor type - DHT 22  (AM2302)
int ESTIVO = 8;
int INVERNALE = 7;
int ESTIVO_State = 0; // definisco lo stato basso (vcc 0v)
int INVERNALE_State = 0; // definisco lo stato basso (vcc 5v)
DHT dht1(DHT1PIN, DHTTYPE);
DHT dht2(DHT2PIN, DHTTYPE);
#include <LiquidCrystal_I2C.h>
#include <Wire.h> 
LiquidCrystal_I2C lcd(0x27,20,4); 

byte degreeChar[8] =  // 
{ B01100,
  B10010,
  B10010,
  B01100,
  B00000,
  B00000,
  B00000,
  B00000,
};

void setup()
{
  lcd.init(); 
  Serial.begin(9600); //avvio comunicazione seriale
  pinMode(10, OUTPUT); // Ventola 1
  pinMode(9, OUTPUT); // Ventola 2
  pinMode(8, INPUT); //Input per il programma estivo
  pinMode(7, INPUT); //Input per il programma invernale
 
  digitalWrite(10, LOW); // definisco lo stato della ventola a riposo
  digitalWrite(9, LOW); // definisco lo stato della ventola a riposo
 
 
  lcd.begin(16, 2); //  start LCD
  dht1.begin(); //  start sensor1
  dht2.begin(); //  start sensor2

}

void loop()
{
  float h1 = dht1.readHumidity();     // variable for humidity of sensor #1
  float t1 = dht1.readTemperature();  // variable for temperature of sensor #1
  float h2 = dht2.readHumidity();     // variable for humidity of sensor #2
  float t2 = dht2.readTemperature();  // variable for temperature of sensor #2
  delay(2000);                        // wait 2 seconds for sensors to be ready
  if (isnan(t1) || isnan(h1)) {       // checking sensor #1
    lcd.setCursor(0, 0);
    lcd.print("DHT22 SENSOR 1 ERROR");// print error message
    //if sensor is not working
  }
  else {                              // if sensor OK - print measurements
    lcd.setCursor(0, 0);
    lcd.print("t1=");
    lcd.print(t1);
    lcd.createChar(0, degreeChar);
    lcd.setCursor(8, 0);
    lcd.write(byte(0));
    lcd.print("C ");
    lcd.print("h1=");
    lcd.print(h1);
    lcd.print("%");
  }
  if (isnan(t2) || isnan(h2)) {       // checking sensor #2
    lcd.setCursor(0, 2);
    lcd.print("DHT22 SENSOR 2 ERROR");// print error message
    //if sensor is not working
  }
  else {                              // if sensor OK - print measurements
    lcd.setCursor(0, 2);
    lcd.print("t2=");
    lcd.print(t2);
    lcd.createChar(0, degreeChar);
    lcd.setCursor(8, 2);
    lcd.write(byte(0));
    lcd.print("C ");
    lcd.print("h2=");
    lcd.print(h2);
    lcd.print("%");
  }

  if (t1==t2){
    digitalWrite(10, LOW);
    digitalWrite(9, LOW);
  }

  if (digitalRead(ESTIVO)){
     digitalWrite(9, LOW);
     if (t1<t2){
       digitalWrite(10, HIGH);
     }
     else (digitalWrite(10, LOW));
  }

  if (digitalRead(INVERNALE)){
     digitalWrite(10, LOW);
      if (t1>t2){
        digitalWrite(9, HIGH);
     }
     else (digitalWrite(9, LOW));
  }
}