#include <SPI.h> //for the SD card module
#include <SD.h> // for the  SD card
#include <DHT.h> // for the DHT sensor
#include <RTClib.h> // for  the RTC
//define DHT pin
#define DHTPIN 4     
#define DHTTYPE DHT22 
DHT  dht(DHTPIN, DHTTYPE);
// Create  a file to store the data
File myFile;
// RTC
RTC_DS1307 rtc;
char t[32];

void  setup() {
  //initializing the DHT sensor
  dht.begin();
  //initializing  Serial monitor
  Serial.begin(9600);
  //initializing rtc
  rtc.begin();
  rtc.adjust(DateTime(F(__DATE__),  F(__TIME__)));
  //open file
  myFile=SD.open("DATA.txt", FILE_WRITE);
  myFile.println("DateTime,Temperature  ºC");
  myFile.close();
  Serial.println("DateTime,Temperature  ºC");
}

void loop() {
  loggingTime();
  loggingTemperature();
  delay(5000);
}

void loggingTime() {
  DateTime  now = rtc.now();
  sprintf(t, "%02d:%02d:%02d %02d/%02d/%02d", now.hour(), now.minute(), now.second(), now.day(), now.month(), now.year());  
  //open file
  myFile = SD.open("DATA.txt", FILE_WRITE);
  myFile.print(t);
  myFile.print(",");
  myFile.close();
  //debugging purposes
  Serial.print(t);
  Serial.print(",");
  delay(1000);  
}

void  loggingTemperature() {
  float t = dht.readTemperature();
  //open file
  myFile = SD.open("DATA.txt", FILE_WRITE);
  myFile.print(t);
  myFile.println(",");
  myFile.close();
  //debugging purposes
  Serial.print(t);
  Serial.println(" *C,");
}