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

#define DHTPIN 3     // what pin we're connected to

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

// Connect pin 1 (on the left) of the sensor to +5V
// Connect pin 2 of the sensor to whatever your DHTPIN is
// Connect pin 4 (on the right) of the sensor to GROUND
// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor

LiquidCrystal_I2C lcd(0x27,16,2); 
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  pinMode(12,OUTPUT);              // Alimentation sur patte 12
  digitalWrite(12,1);
  lcd.init();                      // initialize the lcd  
  lcd.backlight();
  lcd.print("DHTxx test!"); 
  dht.begin();
}

void loop() {
  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  int h = dht.readHumidity();
  int t = dht.readTemperature();


  // check if returns are valid, if they are NaN (not a number) then something went wrong!
  if (isnan(t) || isnan(h)) {
    lcd.clear();
    lcd.print("Erreur");
  } else {
    lcd.setCursor(0, 0);
    lcd.print("Hum. rel : "); 
    lcd.print(h);lcd.print(" %");
    lcd.print("  ");
    lcd.setCursor(0, 1);
    lcd.print("   Temp. : "); 
    lcd.print(t);
    lcd.write(223);
    lcd.print("C");
    lcd.print("  ");
  }
}