#include <Wire.h>
#include "RTClib.h"
RTC_DS1307 rtc;

#include <SD.h>
#include <SPI.h>

File myFile;

int pinCS = 10; // Pin 10 auf Arduino Uno
int temperatur = 20;
int i = 0;

void setup() {
    
  Serial.begin(9600);



  while (!Serial);
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    Serial.println("RTC adjusted!"); 

   DateTime now = rtc.now();
   String zeit = ((String) (now.year()) + (now.month()) + (now.day()) + (now.hour()));
   String wetterdaten= (String) temperatur + "|Temperatur";
  
  pinMode(pinCS, OUTPUT);
  
  
  if (SD.begin())
  {
    Serial.println("SD card is ready to use.");
  } else
  {
    Serial.println("SD card initialization failed");
    return;
  }
  
 
  myFile = SD.open("test3.txt", FILE_WRITE|O_TRUNC);
  
  

  if (myFile) {
    Serial.println("Writing to file...");

    
    if ( i==0 )
    {
       myFile.println(zeit+ wetterdaten);
       i=1; 
    }
  
    myFile.close(); 
    Serial.println("Done.");
  }

  else {
    Serial.println("error opening test.txt");
  }


  myFile = SD.open("test3.txt");
  if (myFile) {
    Serial.println("Read:");

    while (myFile.available()) {
      Serial.write(myFile.read());
   }
    myFile.close();
  }
  else {
    Serial.println("error opening test.txt");
  }
  
}
void loop() {

}