#include <U8g2lib.h>
#include <U8glib.h>
#include "SdFat.h"
#include <dht.h>

U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_DEV_0 | U8G_I2C_OPT_NO_ACK | U8G_I2C_OPT_FAST); // Fast I2C / TWI

#define SPI_SPEED SD_SCK_MHZ(4)
#define CS_PIN  10                  // Chip select  
#define DHT22_PIN 7                 // Digital data pin setting




SdFat sd;
dht DHT;


float getTemperature() {              // Temperatur auslesen
  return DHT.temperature;
}

void setup() {
  Serial.begin(115200);
  if (!sd.begin(CS_PIN, SPI_SPEED)) {
    if (sd.card()->errorCode()) {
      Serial.println("SD initialization failed.");
    } else if (sd.vol()->fatType() == 0) {
      Serial.println("Can't find a valid FAT16/FAT32 partition.");
    } else {
      Serial.println("Can't determine error type");
    }
    return;
  }

  Serial.println("Files on card:");
  Serial.println("   Size    Name");

  sd.ls(LS_R | LS_SIZE);

  pinMode(DHT22_PIN, INPUT);        // Temperatursensor umstellen


  u8g.setFont(u8g_font_tpssb); //display-setup
  u8g.setColorIndex(1);
}




void loop() {  // put your main code here, to run repeatedly:


  DHT.read22(DHT22_PIN);

  float Temp = getTemperature();        //Aktuelle temperatur erfassen
  String Temp_out = String(Temp, 2);

  Serial.println(Temp_out);                 //Aktuelle temperatur anzeigen

  u8g.firstPage();
  do {
    u8g.drawStr(10, 10, "Temperatur");
    //u8g.print(10,20, Temp);
  } while ( u8g.nextPage() );

  delay(100);

}