/* 
 *  Temperatur und Feuchigkeitsanzeige auf OLED 128 x 64 I2C Display
 *  und DHT22 / 21 / 11 Temperatur / Feuchtikeit Sensor 
 *          
 */
 
#include "U8glib.h"                    // Library I2C - OLED 128 x 64 Display
#include <Wire.h>                      // Wire Library
#include "DHT.h"                       // Library DHT11 / 22 / 21
#define DHTPIN 8                       // digital pin sensor
#define DHTTYPE DHT22                  // DHT 22  (AM2302), AM2321

int x;
float  f;

char bufferY [20];
char bufferX [21];

 U8GLIB_SH1106_128X64 u8g(U8G_I2C_OPT_DEV_0|U8G_I2C_OPT_FAST);

 
 DHT dht(DHTPIN, DHTTYPE);

 
void setup(void) {                 
  u8g.begin();                        // I2C OLED Display initialiseren                  
  dht.begin();                        // DHT11 / 22 / 21 initialiseren                  
}     

void loop(void) {

   delay(1000);
  int h = dht.readHumidity();         // Variable Feuchtikeuît DHT 22 setzen
  // Read temperature as Celsius (the default)
  int t = dht.readTemperature();      // Variable Temperatur DHT 22 setzen (t)

  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) {
   u8g.drawStr(22,40,"NO CONNECTION");
    return;
  }
  
   // Anzeigeroutine - Modus auf OLED - Display
   u8g.firstPage();
   do {
   
   u8g.setFont(u8g_font_gdr14r);
   u8g.drawStr(0,14,"Termometer");
   
   u8g.setFont(u8g_font_unifont);
    u8g.drawStr( 22, 60, bufferY); 
     sprintf(bufferY, "Temp.: %d", t);
    u8g.drawStr( 22, 40, bufferX); 
     sprintf(bufferX, "Feut.: %d", h);
    u8g.setPrintPos(95, 60); 
    u8g.print("C");
    u8g.setPrintPos(95, 40); 
    u8g.print("%");
    
  } while ( u8g.nextPage() );
}