#include <SPI.h>
#include <SD.h>
#include <DS3231.h>
File myFile;
DS3231 rtc(SDA, SCL);
int pinCS = 53;//pin 10 on arduino

void setup() {
Serial.begin(9600);
pinMode(pinCS, OUTPUT);
//sd card initialisation
if(SD.begin())
{
  Serial.println("sd card is rady to use");
}
else{
  Serial.println("sd card initialisation failed");
  return;
  }
rtc.begin();
}
void loop(){
  Serial.print(rtc.getTimeStr());
  Serial.print(",")
  Serial.println(int(rtc.getTemp()));
//creat/open file
 myFile = SD.open("test.txt", FILE_WRITE);
//if the file is opened okay, write to it:
if(myFile){
  Serial.println("writing to file...");
  //write to file
  myFile.print(rtc.getTimeStr());
  myFile.print(",");
  myFile.println(int(rtc.getTemp()));
  myFile.close();//closing file
  Serial.println("done");
}
//if the file didnt open, printing an error
else{
  Serial.println("error opening test.txt");}
  //reading from the file
   myFile = SD.open("test.txt");
  if(myFile){
    Serial.println("read:");
   //reading the whole file
   while(myFile.available()){
    Serial.write(myFile.read());
   }
   myFile.close();
  }
  else
  {
    Serial.println("error opening test.txt");
  }
  delay(3000);
}
void loop()
{
  //empty
}