EE_IDL.ino

#include <SPI.h>
#include <SD.h>
#include <SparkFunDS1307RTC.h>
#include <Wire.h>
#include "max6675.h"

int ktcSO = 8;
int ktcCS = 9;
int ktcCLK = 10;
const int chipSelect = 4;
#define SQW_INPUT_PIN 2   // Input pin to read SQW

MAX6675 ktc(ktcCLK, ktcCS, ktcSO);

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  pinMode(SQW_INPUT_PIN, INPUT_PULLUP);  
  digitalRead(SQW_INPUT_PIN);
  
  rtc.begin(); // Call rtc.begin() to initialize the library
  // (Optional) Sets the SQW output to a 1Hz square wave.
  // (Pull-up resistor is required to use the SQW pin.)
  rtc.writeSQW(SQW_SQUARE_1);

  // Now set the time...
  // You can use the autoTime() function to set the RTC's clock and
  // date to the compiliers predefined time. (It'll be a few seconds
  // behind, but close!)
 // rtc.autoTime();
  // Or you can use the rtc.setTime(s, m, h, day, date, month, year)
  // function to explicitly set the time:
  // e.g. 7:32:16 | Monday October 31, 2016:
   //rtc.setTime(58, 33, 8, 4, 9, 3, 17);  // Uncomment to manually set time
  // rtc.set12Hour(); // Use rtc.set12Hour to set to 12-hour mode
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }


  Serial.print("Initializing SD card...");

  // see if the card is present and can be initialized:
  if (!SD.begin(chipSelect)) {
    Serial.println("Card failed, or not present");
    // don't do anything more:
    return;
  }
  Serial.println("card initialized.");
  delay(500);
}

void loop() {

  static int8_t lastSecond = -1;
  
  // Call rtc.update() to update all rtc.seconds(), rtc.minutes(),
  // etc. return functions.
  rtc.update();

  if (rtc.second() != lastSecond) // If the second has changed
  {
    printTime(); // Print the new time
    
    lastSecond = rtc.second(); // Update lastSecond value
  }

  // Read the state of the SQW pin and show it on the
  // pin 13 LED. (It should blink at 1Hz.)
  digitalRead(SQW_INPUT_PIN);
  

   // make a string for assembling the data to log:
  String dataString = "";   
   float sensor = ktc.readCelsius();
  // Serial.print(sensor);   
    dataString += String(sensor);

     // open the file. note that only one file can be open at a time,
  // so you have to close this one before opening another.
  File dataFile = SD.open("datalog.csv", FILE_WRITE);

  // if the file is available, write to it:
  if (dataFile) {
    dataFile.print(String(rtc.hour()) + ":"); // Print hour
    dataFile.print(String(rtc.minute()) + ":"); // Print minute
    dataFile.print(String(rtc.second())); // Print second
    dataFile.print(";");
    dataFile.print(String(rtc.date()) + "/" +    // (or) print date
                 String(rtc.month()) + "/"); // Print month
    dataFile.print(String(rtc.year()));        // Print year   
    dataFile.print(";");          
    
    dataFile.print("Temprature;"); // Temprature 
    dataFile.print(dataString);    
    dataFile.println(";");
    dataFile.close();
    // print to the serial port too:
    Serial.println(dataString);
    delay(5000);
  }
  // if the file isn't open, pop up an error:
  else {
    Serial.println("error opening datalog.txt");
  }
}

void printTime()
{
  Serial.print(String(rtc.hour()) + ":"); // Print hour
  if (rtc.minute() < 10)
    Serial.print('0'); // Print leading '0' for minute
  Serial.print(String(rtc.minute()) + ":"); // Print minute
  if (rtc.second() < 10)
    Serial.print('0'); // Print leading '0' for second
  Serial.print(String(rtc.second())); // Print second

  if (rtc.is12Hour()) // If we're in 12-hour mode
  {
    // Use rtc.pm() to read the AM/PM state of the hour
    if (rtc.pm()) Serial.print(" PM"); // Returns true if PM
    else Serial.print(" AM");
  }
  
  Serial.print(" | ");

  // Few options for printing the day, pick one:
  Serial.print(rtc.dayStr()); // Print day string
  //Serial.print(rtc.dayC()); // Print day character
  //Serial.print(rtc.day()); // Print day integer (1-7, Sun-Sat)
  Serial.print(" - ");
#ifdef PRINT_USA_DATE
  Serial.print(String(rtc.month()) + "/" +   // Print month
                 String(rtc.date()) + "/");  // Print date
                 
#else
  Serial.print(String(rtc.date()) + "/" +    // (or) print date
                 String(rtc.month()) + "/"); // Print month
#endif
  Serial.println(String(rtc.year()));        // Print year
}