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

DHT dht(3, DHT22);
File myfile;
RTC_DS3231 rtc;
char date[32];
char time[32];

void setup() {
  Serial.begin(9600);
  rtc.begin();
  rtc.adjust(DateTime(F(__DATE__),F(__TIME__)));
  dht.begin();
  delay(1000);
  myfile = SD.open("TEMP.txt", FILE_WRITE);
  myfile.println("Date,Time,Temperature,");
  myfile.close();
  Serial.println("Date,Time,Temperature,");
}

void loop() {
  float temp = dht.readTemperature();
  DateTime now = rtc.now();
  sprintf(date,"%02d:%02d:%02d", now.day(),now.month(),now.year());
  sprintf(time,"%02d:%02d:%02d", now.hour(),now.minute(),now.second());
  myfile = SD.open("TEMP.txt", FILE_WRITE);
  myfile.print(date);
  myfile.print(",");
  myfile.print(time);
  myfile.print(",");
  myfile.print(temp);
  myfile.println(",");
  myfile.close();
  Serial.print(date);
  Serial.print(",");
  Serial.print(time);
  Serial.print(",");
  Serial.print(temp);
  Serial.println(",");
  delay(1000);
}