DS18B20 Data Logger

A data logger is a time or a location based electronic device used to store data. The type of data can be virtually anything: distance, speed, acceleration, temperature, pressure, humidity, current, voltage, resistance…

To keep track of the events it’s important to match that event with its corresponding time, location or both. Then you need a storage device to hold that data.

Depending on the volume of the data, you can use the internal memory of the microcontroller, an external memory chip, memory cards or even hard-drives.

For this project, you need the following items:

– 1x Arduino Nano 3.0
– 1x DS1307 real-time clock module
– 1x SD card module (with voltage conversion chip from 5V to 3.3V)
– 1x SD card
– 3x DS18B20 temperature sensor
– 1x 4.7kOhm resistor
– 1x 10kOhm resistor
– Breadboard and wires

Before compiling the code you need to download, uncompress and install the following libraries: DallasTemperature, OneWire, RTClib and SD. Keep in mind that there is a standard SD library which comes with the Arduino IDE package but you need to replace it with this one or the code will not compile (renaming the the folder of the standard SD library might cause the same issue, so, I recommend removing it). To install all these libraries simply copy them into the “libraries” folder. Alternatively you can read the official tutorial: Installing Additional Arduino Libraries

Software:

/*****************************************************************************
* Copyright (C) 2014-2015 by Vasco Ferraz. All Rights Reserved.              *
*                                                                            *
* This program is free software: you can redistribute it and/or modify       *
* it under the terms of the GNU General Public License as published by       *
* the Free Software Foundation, either version 3 of the License, or          *
* (at your option) any later version.                                        *
*                                                                            *
* This program is distributed in the hope that it will be useful,            *
* but WITHOUT ANY WARRANTY; without even the implied warranty of             *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the               *
* GNU General Public License for more details.                               *
*                                                                            *
* You should have received a copy of the GNU General Public License          *
* along with this program. If not, see <http://www.gnu.org/licenses/>.       *
*                                                                            *
*  Author:        Vasco Ferraz                                               *
*  Contact:       http://vascoferraz.com/contact/                            *
*  Description:   http://vascoferraz.com/projects/ds18b20-data-logger/       *
*****************************************************************************/

// Import libraries
#include <Wire.h> // I2C and TWI library
#include <RTClib.h> // RTClib library
#include <OneWire.h> // OneWire library
#include <DallasTemperature.h> // DallasTemperature library
#include <SPI.h> // SPI library
#include <SD.h> // SD library

// Define constants
#define DS1307_I2C_ADDRESS 0x68 // Each I2C object has a unique bus address, the DS1307 (Real Time Clock) is 0x68
#define ONE_WIRE_BUS 2 // Define that the input/output data pin from the DS18B20 (temperature sensor) is connected in Arduino's digital I/O pin number 2
#define TEMPERATURE_PRECISION 12 // Define the precision of the conversion: 9bit, 10bit, 11bit or 12bit

// Declare objects
RTC_DS1307 RTC; // Declare variable RTC of type RTC_DS1307
OneWire oneWire(ONE_WIRE_BUS); // Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
DallasTemperature sensors(&oneWire); // Pass our oneWire reference to Dallas Temperature. That is, tell Dallas Temperature Library to use oneWire Library
File myFile; // Declare variable myFile of type File

// Declare variables
DeviceAddress temperatureSensor1, temperatureSensor2, temperatureSensor3; // Arrays to store addresses
unsigned int second, minute, hour, dayOfTheWeek, day, month, year;
unsigned char previous_second=1; // This variable is used to write the datalog.txt at a pace of 10 seconds
unsigned int year_2000; // "year" goes from 0 up to 99 and not from 2000 up to 2099. This variable is used to simplify this situation
unsigned int counter=0; const unsigned int maxcounter=3000;
unsigned char flag=0;

byte decToBcd(byte val){return ( (val/10*16) + (val%10) );} // Convert normal decimal numbers to binary coded decimal
byte bcdToDec(byte val){return ( (val/16*10) + (val%16) );} // Convert binary coded decimal to normal decimal numbers

const char chipSelect = 10; // SD module's Chip Select (CS) pin
const char cardDetect = 3;  // SD module's Card Detect (CD) pin

// The setup function runs only once when you power or reset the board
void setup ()
{
  pinMode(cardDetect, INPUT); // Initialize the cardDetect pin as an input
  
  Serial.begin(9600); // Open serial port and sets data rate to 9600 bps
  Wire.begin(); // Start the Wire (I2C communications)
  RTC.begin(); // Start the RTC Chip
  sensors.begin(); // Start the DallasTemperature library
  
  while (! Serial); // Wait until Serial is ready (needed for Leonardo only)
  Serial.setTimeout(10); // Sets the maximum milliseconds to wait for serial data
  
  Serial.println(F("INITIALIZING:")); // Initialize services
  
  freeMem(); // Print free SRAM in Serial Monitor
  initSerialCommunication(); // Initialize serial communication
  initRTC(); // Initialize Real Time Clock
  initSDcard(); // Initialize SD card
  initOneWire(); // Initialize OneWire devices
  
  Serial.println();
  Serial.println(F("LOGGER IS RUNNING:"));
  repetitiveStrings();
}

// The loop function runs over and over again forever
void loop ()
{
  readClock(); // Read clock and store current time and date into the following variables: second, minute, hour, dayOfTheWeek, day, month and year
  
  if(Serial.available())
  {
   if (Serial.peek() == 'p')
   {
   Serial.read(); // Clear serial buffer
   Serial.println(F("- Printing current time, date and temperature -"));
   printTime(); // Print hour, minute and second in Serial Monitor
   Serial.print(F(" | "));
   printDate(); // Print day, month, year and weekday in Serial Monitor
   Serial.println();
   
   sensors.requestTemperatures();
   
   Serial.print(F("Device 0 Temperature: "));
   printTemperatureInC(temperatureSensor1); // Print the temperature of a device in ºC in Serial Monitor
   Serial.print(F("Device 1 Temperature: "));
   printTemperatureInC(temperatureSensor2); // Print the temperature of a device in ºC in Serial Monitor
   Serial.print(F("Device 2 Temperature: "));
   printTemperatureInC(temperatureSensor3); // Print the temperature of a device in ºC in Serial Monitor
   
   Serial.println();
   repetitiveStrings();
   }
   
   else if (Serial.peek() == 't')
   {
   Serial.read(); // Clear serial buffer
   Serial.println(F("- Entering time setup -"));
   Serial.print(F("Current time: "));
   printTime();
   Serial.println();
   
   setHour();
   setMinute();
   setSecond();
   
   Serial.print(F("Current time: "));
   printTime();
   Serial.println();
   Serial.println();
   repetitiveStrings();
   }
  
   else if (Serial.peek() == 'd')
   {
   Serial.read(); // Clear serial buffer
   Serial.println(F("- Entering date setup -"));
   Serial.print(F("Current date: "));
   printDate();
   Serial.println();
   
   setDay();
   setMonth();
   setYear();
   
   Serial.print(F("Current date: "));
   printDate();
   Serial.println();
   Serial.println();
   repetitiveStrings();
   }
  
   else if (Serial.peek() == 'u')
   {
   Serial.read(); // Clear serial buffer
   Serial.println(F("- SD card unmounting -"));
   Serial.print(F("SD card unmounted"));
   SD.end();
   Serial.println();
   Serial.println();
   repetitiveStrings();
   }
   
   else if (Serial.peek() == 'm')
   {
   Serial.read(); // Clear serial buffer
   Serial.println(F("- SD card mounting -"));
   Serial.print(F("SD card mounted"));
   SD.begin(chipSelect);
   Serial.println();
   Serial.println();
   repetitiveStrings();
   }
  
   else if (Serial.peek() != 'p' || Serial.peek() != 't' || Serial.peek() != 'd' || Serial.peek() != 'u' || Serial.peek() != 'm')
   {
   Serial.read(); // Clear serial buffer
   Serial.println(F("- Char not accepted -"));
   repetitiveStrings();
   }
  
   while (Serial.read() >= 0){;} // Flush remaining characters
  }
  
  if (digitalRead(cardDetect) == LOW && second%10 == 0 && previous_second != second)
   {
    temperatureLogger();
    previous_second = second;
   }
   
  if (digitalRead(cardDetect) == HIGH && second%10 == 0 && previous_second != second)
   {
    Serial.println(F("- Datalog status -"));
    Serial.println(F("Failed - SD card was removed"));
    Serial.println();
    SD.end();
    previous_second = second;
   }
}

// Print hour, minute and second in Serial Monitor
void printTime (void)
{
  DateTime now = RTC.now();
 
  // Print hour in Serial Monitor
  if (now.hour() <= 9)
  {
    Serial.print(F("0")); Serial.print(now.hour(), DEC); Serial.print(F(":"));
  }
    else { Serial.print(now.hour(), DEC); Serial.print(F(":")); }
 
  // Print minute in Serial Monitor
  if (now.minute() <= 9)
  {
    Serial.print(F("0")); Serial.print(now.minute(), DEC); Serial.print(F(":"));
  }
    else { Serial.print(now.minute(), DEC); Serial.print(F(":")); }
 
  // Print second in Serial Monitor
   if (now.second() <= 9)
  {
    Serial.print(F("0")); Serial.print(now.second(), DEC);
  }
    else { Serial.print(now.second(), DEC); }
}
 
 
// Print day, month, year and weekday in Serial Monitor
void printDate (void)
{
  DateTime now = RTC.now();
  
  // Print day in Serial Monitor
  if (now.day() <= 9)
  {
    Serial.print(F("0")); Serial.print(now.day(), DEC); Serial.print(F("/"));
  }
    else { Serial.print(now.day(), DEC); Serial.print(F("/")); }
 
  // Print month in Serial Monitor
  switch(now.month())
  {
  case 1:  Serial.print(F("Jan/")); break;
  case 2:  Serial.print(F("Feb/")); break;
  case 3:  Serial.print(F("Mar/")); break;
  case 4:  Serial.print(F("Apr/")); break;
  case 5:  Serial.print(F("May/")); break;
  case 6:  Serial.print(F("Jun/")); break;
  case 7:  Serial.print(F("Jul/")); break;
  case 8:  Serial.print(F("Aug/")); break;
  case 9:  Serial.print(F("Sep/")); break;
  case 10: Serial.print(F("Oct/")); break;
  case 11: Serial.print(F("Nov/")); break;
  case 12: Serial.print(F("Dec/")); break;
  default: Serial.print(F("Err/"));
  }
 
  // Print year in Serial Monitor
  Serial.print(now.year(), DEC);
 
  // Print weekday in Serial Monitor
  switch(now.dayOfTheWeek())
  {
  case 0:  Serial.print(F(" | Sunday"));    break;
  case 1:  Serial.print(F(" | Monday"));    break;
  case 2:  Serial.print(F(" | Tuesday"));   break;
  case 3:  Serial.print(F(" | Wednesday")); break;
  case 4:  Serial.print(F(" | Thursday"));  break;
  case 5:  Serial.print(F(" | Friday"));    break;
  case 6:  Serial.print(F(" | Saturday"));  break;
  default: Serial.print(F(" | Error"));
  }
}

// Read clock and store current time and date into the following variables: second, minute, hour, dayOfTheWeek, day, month and year
void readClock(void)
{
 Wire.beginTransmission(DS1307_I2C_ADDRESS);
 Wire.write(0x00);
 Wire.endTransmission();
 Wire.requestFrom(DS1307_I2C_ADDRESS, 7);
 second = bcdToDec(Wire.read());
 minute = bcdToDec(Wire.read());
 hour = bcdToDec(Wire.read());
 dayOfTheWeek = bcdToDec(Wire.read());
 day = bcdToDec(Wire.read());
 month = bcdToDec(Wire.read());
 year = bcdToDec(Wire.read());
}

// Function to adjust the RTC
void adjustClock (unsigned char address, unsigned int clockVariable)
{
 Wire.beginTransmission(DS1307_I2C_ADDRESS);
 Wire.write(address);
 Wire.write(decToBcd(clockVariable));
 Wire.endTransmission();
 Serial.println(F("Valid"));
 Serial.read(); // Clear serial buffer
 counter=maxcounter;
 flag=1;
}

// Set hour
void setHour (void)
{
 flag=0;
 counter=0;
 Serial.print(F("Enter hour [0,23]: "));
  
  if (Serial.available() == 0)
  {
   for (counter=0 ; counter <=maxcounter ; counter++)
   {
   delay(1);
   
   // Do not accept the entry if the introduced char is not a number (48 and 57 represents digit 0 and 9 in ASCII, respectively)
   if ( (Serial.peek() >= 0 && Serial.peek() <= 47) || (Serial.peek() >= 58 && Serial.peek() <= 255) )
    {
     Serial.read(); // Clear serial buffer
     Serial.println(F("Not valid"));
     setHour();
    }
     
   if ( Serial.peek() >= 48 && Serial.peek() <= 57 )
    {
     hour = Serial.parseInt();
     if (hour >= 0 && hour <= 23)
     {adjustClock (0x02, hour);}
     else {Serial.println(F("Not Valid")); Serial.read(); setHour();}   
    }
   }
    if (flag == 0)
     {
      flag=1;
      Serial.read(); // Clear serial buffer
      Serial.println(F("Unchanged"));
     }
  }
}

// Set minute
void setMinute (void)
{
 flag=0;
 counter=0;
 Serial.print(F("Enter minute [0,59]: "));
  
  if (Serial.available() == 0)
  {
   for (counter=0 ; counter <=maxcounter ; counter++)
   {
   delay(1);
   
   // Do not accept the entry if the introduced char is not a number (48 and 57 represents digit 0 and 9 in ASCII, respectively)
   if ( (Serial.peek() >= 0 && Serial.peek() <= 47) || (Serial.peek() >= 58 && Serial.peek() <= 255) )
    {
     Serial.read(); // Clear serial buffer
     Serial.println(F("Not valid"));
     setMinute();
    }
     
   if ( Serial.peek() >= 48 && Serial.peek() <= 57 )
    {
     minute = Serial.parseInt();
     if (minute >= 0 && minute <= 59)
     {adjustClock (0x01, minute);}
     else {Serial.println(F("Not Valid")); Serial.read(); setMinute();}
    }
   }
    if (flag == 0)
     {
      flag=1;
      Serial.read(); // Clear serial buffer
      Serial.println(F("Unchanged"));
     }
  }
}

// Set second
void setSecond (void)
{
 flag=0;
 counter=0;
 Serial.print(F("Enter second [0,59]: "));
  
  if (Serial.available() == 0)
  {
   for (counter=0 ; counter <=maxcounter ; counter++)
   {
   delay(1);
   
   // Do not accept the entry if the introduced char is not a number (48 and 57 represents digit 0 and 9 in ASCII, respectively)
   if ( (Serial.peek() >= 0 && Serial.peek() <= 47) || (Serial.peek() >= 58 && Serial.peek() <= 255) )
    {
     Serial.read(); // Clear serial buffer
     Serial.println(F("Not valid"));
     setSecond();
    }
     
   if ( Serial.peek() >= 48 && Serial.peek() <= 57 )
    {
     second = Serial.parseInt();
     if (second >= 0 && second <= 59)
     {adjustClock (0x00, second);}
     else {Serial.println(F("Not Valid")); Serial.read(); setSecond();}
    }
   }
    if (flag == 0)
     {
      flag=1;
      Serial.read(); // Clear serial buffer
      Serial.println(F("Unchanged"));
     }
  }
}

// Set day
void setDay (void)
{
 flag=0;
 counter=0;
 Serial.print(F("Enter day [1,31]: "));
  
  if (Serial.available() == 0)
  {
   for (counter=0 ; counter <=maxcounter ; counter++)
   {
   delay(1);
   
   // Do not accept the entry if the introduced char is not a number (48 and 57 represents digit 0 and 9 in ASCII, respectively)
   if ( (Serial.peek() >= 0 && Serial.peek() <= 47) || (Serial.peek() >= 58 && Serial.peek() <= 255) )
    {
     Serial.read(); // Clear serial buffer
     Serial.println(F("Not valid"));
     setDay();
    }
     
   if ( Serial.peek() >= 48 && Serial.peek() <= 57 )
    {
     day = Serial.parseInt();
     
     if (day >= 1 && day <= 31 && (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12))
     {adjustClock (0x04, day);}
     
     else if (day >= 1 && day <= 30 && (month == 4 || month == 6 || month == 9 || month == 11))
     {adjustClock (0x04, day);}
     
     else if (day >= 1 && day <= 29 && month == 2 && year%4 == 0)
     {adjustClock (0x04, day);}
     
     else if (day >= 1 && day <= 28 && month == 2 && year%4 != 0)
     {adjustClock (0x04, day);}

else {Serial.println(F("Not Valid")); Serial.read(); setDay();}
    }
   }
    if (flag == 0)
     {
      flag=1;
      Serial.read(); // Clear serial buffer
      Serial.println(F("Unchanged"));
     }
  }
}

// Set month
void setMonth (void)
{
 flag=0;
 counter=0;
 Serial.print(F("Enter month [1,12]: "));
  
  if (Serial.available() == 0)
  {
   for (counter=0 ; counter <=maxcounter ; counter++)
   {
   delay(1);
   
   // Do not accept the entry if the introduced char is not a number (48 and 57 represents digit 0 and 9 in ASCII, respectively)
   if ( (Serial.peek() >= 0 && Serial.peek() <= 47) || (Serial.peek() >= 58 && Serial.peek() <= 255) )
    {
     Serial.read(); // Clear serial buffer
     Serial.println(F("Not valid"));
     setMonth();
    }
     
   if ( Serial.peek() >= 48 && Serial.peek() <= 57 )
    {
     month = Serial.parseInt();
     
     if (month == 1 && day >= 1 && day <= 31 )
     {adjustClock (0x05, month);}
      
     else if (month == 2 && day >= 1 && day <= 29 && year%4 == 0)
     {adjustClock (0x05, month);}
      
     else if (month == 2 && day >= 1 && day <= 28 && year%4 != 0)
     {adjustClock (0x05, month);}
      
     else if (month == 3 && day >= 1 && day <= 31 )
     {adjustClock (0x05, month);}
      
     else if (month == 4 && day >= 1 && day <= 30 )
     {adjustClock (0x05, month);}
      
     else if (month == 5 && day >= 1 && day <= 31 )
     {adjustClock (0x05, month);}
      
     else if (month == 6 && day >= 1 && day <= 30 )
     {adjustClock (0x05, month);}
      
     else if (month == 7 && day >= 1 && day <= 31 )
     {adjustClock (0x05, month);}
      
     else if (month == 8 && day >= 1 && day <= 31 )
     {adjustClock (0x05, month);}
      
     else if (month == 9 && day >= 1 && day <= 30 )
     {adjustClock (0x05, month);}
      
     else if (month == 10 && day >= 1 && day <= 31 )
     {adjustClock (0x05, month);}
        
     else if (month == 11 && day >= 1 && day <= 30 )
     {adjustClock (0x05, month);}
      
     else if (month == 12 && day >= 1 && day <= 31 )
     {adjustClock (0x05, month);}

else {Serial.println(F("Not Valid")); Serial.read(); setMonth();}
    }
   }
    if (flag == 0)
     {
      flag=1;
      Serial.read(); // Clear serial buffer
      Serial.println(F("Unchanged"));
     }
  }
}

// Set year
void setYear (void)
{
 flag=0;
 counter=0;
 Serial.print(F("Enter year [2014,2030]: "));
  
  if (Serial.available() == 0)
  {
   for (counter=0 ; counter <=maxcounter ; counter++)
   {
   delay(1);
   
   // Do not accept the entry if the introduced char is not a number (48 and 57 represents digit 0 and 9 in ASCII, respectively)
   if ( (Serial.peek() >= 0 && Serial.peek() <= 47) || (Serial.peek() >= 58 && Serial.peek() <= 255) )
    {
     Serial.read(); // Clear serial buffer
     Serial.println(F("Not valid"));
     setYear();
    }
     
   if ( Serial.peek() >= 48 && Serial.peek() <= 57 )
    {
     year_2000 = Serial.parseInt();         
     if (year_2000 >= 2014 && year_2000 <= 2030) 
     {year = year_2000 - 2000; adjustClock (0x06, year);}
     
     else {Serial.println(F("Not Valid")); Serial.read(); setYear();}
    }
   }
    if (flag == 0)
     {
      flag=1;
      Serial.read(); // Clear serial buffer
      Serial.println(F("Unchanged"));
     }
  }
}

// Repetitive strings
void repetitiveStrings(void)
{
 Serial.println(F("Type 'p' to print current time, date and temperature"));
 Serial.println(F("Type 't' or 'd' to setup the time or date"));
 Serial.println(F("Type 'm' or 'u' to mount or unmount the SD card"));
 Serial.println();
}

// Write time, date and temperature into the datalog file
void temperatureLogger(void)
{
 DateTime now = RTC.now();
 
 sensors.requestTemperatures();
 
 // Open the file. Keep in mind that only one file can be open at a time, so you have to close this one before opening another.
 myFile = SD.open("datalog.txt", FILE_WRITE); 
 
 if (!myFile)
 {
  Serial.println(F("- Datalog status -"));
  Serial.println(F("Failed - SD card was unmounted"));
  Serial.println();
 }
 
 else if (myFile)
 {
  // Write hour into the datalog file
  if (now.hour() <= 9)
  {
    myFile.print(F("0")); myFile.print(now.hour(), DEC); myFile.print(F(":"));
  }
    else { myFile.print(now.hour(), DEC); myFile.print(F(":")); }
 
  // Write minute into the datalog file
  if (now.minute() <= 9)
  {
    myFile.print(F("0")); myFile.print(now.minute(), DEC); myFile.print(F(":"));
  }
    else { myFile.print(now.minute(), DEC); myFile.print(F(":")); }
  
  // Write second into the datalog file
   if (now.second() <= 9)
  {
    myFile.print(F("0")); myFile.print(now.second(), DEC);
  }
    else { myFile.print(now.second(), DEC); }
       
  // Write day into the datalog file
  myFile.print(F(" | "));
  if (now.day() <= 9)
  {
    myFile.print(F("0")); myFile.print(now.day(), DEC); myFile.print(F("/"));
  }
    else { myFile.print(now.day(), DEC); myFile.print(F("/")); }
 
  // Write month into the datalog file
  switch(now.month())
  {
  case 1:  myFile.print(F("Jan/")); break;
  case 2:  myFile.print(F("Feb/")); break;
  case 3:  myFile.print(F("Mar/")); break;
  case 4:  myFile.print(F("Apr/")); break;
  case 5:  myFile.print(F("May/")); break;
  case 6:  myFile.print(F("Jun/")); break;
  case 7:  myFile.print(F("Jul/")); break;
  case 8:  myFile.print(F("Aug/")); break;
  case 9:  myFile.print(F("Sep/")); break;
  case 10: myFile.print(F("Oct/")); break;
  case 11: myFile.print(F("Nov/")); break;
  case 12: myFile.print(F("Dec/")); break;
  default: myFile.print(F("Err/"));
  }
 
  // Write year into the datalog file
  myFile.print(now.year(), DEC);
 
  // Write weekday into the datalog file
  switch(now.dayOfTheWeek())
  {
  case 0:  myFile.println(F(" | Sunday"));    break;
  case 1:  myFile.println(F(" | Monday"));    break;
  case 2:  myFile.println(F(" | Tuesday"));   break;
  case 3:  myFile.println(F(" | Wednesday")); break;
  case 4:  myFile.println(F(" | Thursday"));  break;
  case 5:  myFile.println(F(" | Friday"));    break;
  case 6:  myFile.println(F(" | Saturday"));  break;
  default: myFile.println(F(" | Error"));
  }
 
  // Write temperatures into the datalog file
  myFile.print(F("Device 0 Temperature: "));
  writeTemperatureInC(temperatureSensor1);
  myFile.print(F("Device 1 Temperature: "));
  writeTemperatureInC(temperatureSensor2);
  myFile.print(F("Device 2 Temperature: "));
  writeTemperatureInC(temperatureSensor3);
  
  myFile.println();
  myFile.close();
  Serial.println(F("- Datalog status -"));
  Serial.println(F("OK"));
  Serial.println();
 }
}

// Print the address of a device in Serial Monitor
void printAddress(DeviceAddress deviceAddress)
{
  for (uint8_t i = 0; i < 8; i++)
  {
    // Zero pad the address if necessary
    if (deviceAddress[i] < 16) Serial.print(F("0"));
    Serial.print(deviceAddress[i], HEX);
  }
}

// Print the resolution of a device in Serial Monitor
void printResolution(DeviceAddress deviceAddress)
{
  Serial.print(sensors.getResolution(deviceAddress), DEC);
  Serial.println(F(" bit"));
}

// Print the temperature of a device in ºC in Serial Monitor
void printTemperatureInC(DeviceAddress deviceAddress)
{
  float tempC = sensors.getTempC(deviceAddress);
  Serial.print(tempC);
  Serial.println(F(" degrees Celsius"));
}

// Write the temperature of a device in ºC into the SD memory card
void writeTemperatureInC(DeviceAddress deviceAddress)
{
  float tempC = sensors.getTempC(deviceAddress);
  myFile.print(tempC);
  myFile.println(F(" degrees Celsius"));
}

// Initialize serial communication
void initSerialCommunication()
{
 Serial.print(F("Serial communication: "));
  if (!Serial)
   {Serial.println(F("Failed")); delay(7000); initSerialCommunication();}
  else Serial.println(F("OK"));
}

// Initialize Real Time Clock
void initRTC()
{
 //RTC.adjust(DateTime(__DATE__, __TIME__)); // This line sets the RTC to the date and time this sketch was compiled
 Serial.print(F("RTC: "));
  if (!RTC.isrunning()) // If the clock is not running, execute the following code
   {
    Serial.print(F("Not Running! Restarting the RTC. "));
    // Starts ticking the clock
    Wire.beginTransmission(DS1307_I2C_ADDRESS);
    Wire.write(0x00); // Move pointer to 0x00 byte address
    Wire.write(0x00); // Sends 0x00. The whole byte is set to zero (0x00). This also means seconds will reset!! Unless you use a mask -> homework :)
    Wire.endTransmission();
    
    // Following line sets the RTC to the date & time to: 2015 January 01 - 00:00:00
    RTC.adjust(DateTime(2015,1,1, 0,0,0)); // Sequence: year, month, day,  hour, minute, second
   }
  if (RTC.isrunning())
   {Serial.println(F("OK"));}
  if (!RTC.isrunning())
   {Serial.println(F("Failed")); delay(7000); initRTC();}
}

// Initialize SD card
void initSDcard()
{
 Serial.print(F("SD card: "));
  pinMode(SS, OUTPUT); // On the Ethernet Shield, Chip Select (CS) is pin 4. It's set as an output by default.
                       // Note that even if it's not used as the CS pin, the hardware SS pin
                       // (10 on most Arduino boards, 53 on the Mega) must be left as an output or the SD library functions will not work.
  if (!SD.begin(chipSelect))
   {Serial.println(F("Failed")); delay(7000); initSDcard();}
  else Serial.println(F("OK"));
}

// Initialize OneWire devices
void initOneWire()
{
  Serial.println();
  Serial.println(F("DETECTING ONEWIRE DEVICES:")); // Detect all OneWire devices
  
  // Find all devices on the bus
  Serial.print(F("Devices found: "));
  Serial.println(sensors.getDeviceCount(), DEC);
   
  // Search for all devices on the bus and assign them based on an index.
  if (!sensors.getAddress(temperatureSensor1, 0)) Serial.println(F("Unable to find address for Device 0"));
  if (!sensors.getAddress(temperatureSensor2, 1)) Serial.println(F("Unable to find address for Device 1"));
  if (!sensors.getAddress(temperatureSensor3, 2)) Serial.println(F("Unable to find address for Device 2"));
  
  // Set the resolution of the temperature sensors
  sensors.setResolution(temperatureSensor1, TEMPERATURE_PRECISION);
  sensors.setResolution(temperatureSensor2, TEMPERATURE_PRECISION);
  sensors.setResolution(temperatureSensor3, TEMPERATURE_PRECISION);
  
  // Print the address and resolution of the temperature sensors found on the bus
  Serial.print(F("Device 0 Address/Resolution: "));
  printAddress(temperatureSensor1);
  Serial.print(F(" / "));
  printResolution(temperatureSensor1);
  
  Serial.print(F("Device 1 Address/Resolution: "));
  printAddress(temperatureSensor2);
  Serial.print(F(" / "));
  printResolution(temperatureSensor2);
 
  Serial.print(F("Device 2 Address/Resolution: "));
  printAddress(temperatureSensor3);
  Serial.print(F(" / "));
  printResolution(temperatureSensor3);
  
  // Is parasite power being used? For more information about parasite power you must read the datasheet of the DS18B20 temperature sensor
  Serial.print(F("Parasite power is: "));
  if (sensors.isParasitePowerMode()) Serial.println(F("ON"));
  else Serial.println(F("OFF"));
}

// Print free SRAM in Serial Monitor
uint16_t freeMem()
{
  char top;
  extern char *__brkval;
  extern char __bss_end;
  Serial.print(F("Available SRAM: "));
  Serial.print( __brkval ? &top - __brkval : &top - &__bss_end);
  Serial.println(F(" bytes"));
}

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/*****************************************************************************

* *

* This program is free software: you can redistribute it and/or modify *

* it under the terms of the GNU General Public License as published by *

* the Free Software Foundation, either version 3 of the License, or *

* (at your option) any later version. *

* *

* This program is distributed in the hope that it will be useful, *

* but WITHOUT ANY WARRANTY; without even the implied warranty of *

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *

* GNU General Public License for more details. *

* *

* You should have received a copy of the GNU General Public License *

* along with this program. If not, see <http://www.gnu.org/licenses/>. *

* *

* Author: Vasco Ferraz *

* Contact: http://vascoferraz.com/contact/ *

* Description: http://vascoferraz.com/projects/ds18b20-data-logger/ *

*****************************************************************************/

// Import libraries

#include <Wire.h> // I2C and TWI library

#include <RTClib.h> // RTClib library

#include <OneWire.h> // OneWire library

#include <DallasTemperature.h> // DallasTemperature library

#include <SPI.h> // SPI library

#include <SD.h> // SD library

// Define constants

#define DS1307_I2C_ADDRESS 0x68 // Each I2C object has a unique bus address, the DS1307 (Real Time Clock) is 0x68

#define ONE_WIRE_BUS 2 // Define that the input/output data pin from the DS18B20 (temperature sensor) is connected in Arduino's digital I/O pin number 2

#define TEMPERATURE_PRECISION 12 // Define the precision of the conversion: 9bit, 10bit, 11bit or 12bit

// Declare objects

RTC_DS1307 RTC; // Declare variable RTC of type RTC_DS1307

OneWire oneWire(ONE_WIRE_BUS); // Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)

DallasTemperature sensors(&oneWire); // Pass our oneWire reference to Dallas Temperature. That is, tell Dallas Temperature Library to use oneWire Library

File myFile; // Declare variable myFile of type File

// Declare variables

DeviceAddress temperatureSensor1, temperatureSensor2, temperatureSensor3; // Arrays to store addresses

unsigned int second, minute, hour, dayOfTheWeek, day, month, year;

unsigned char previous_second=1; // This variable is used to write the datalog.txt at a pace of 10 seconds

unsigned int year_2000; // "year" goes from 0 up to 99 and not from 2000 up to 2099. This variable is used to simplify this situation

unsigned int counter=0; const unsigned int maxcounter=3000;

unsigned char flag=0;

byte decToBcd(byte val){return ( (val/10*16) + (val%10) );} // Convert normal decimal numbers to binary coded decimal

byte bcdToDec(byte val){return ( (val/16*10) + (val%16) );} // Convert binary coded decimal to normal decimal numbers

const char chipSelect = 10; // SD module's Chip Select (CS) pin

const char cardDetect = 3; // SD module's Card Detect (CD) pin

// The setup function runs only once when you power or reset the board

void setup ()

{

pinMode(cardDetect, INPUT); // Initialize the cardDetect pin as an input

Serial.begin(9600); // Open serial port and sets data rate to 9600 bps

Wire.begin(); // Start the Wire (I2C communications)

RTC.begin(); // Start the RTC Chip

sensors.begin(); // Start the DallasTemperature library

while (! Serial); // Wait until Serial is ready (needed for Leonardo only)

Serial.setTimeout(10); // Sets the maximum milliseconds to wait for serial data

Serial.println(F("INITIALIZING:")); // Initialize services

freeMem(); // Print free SRAM in Serial Monitor

initSerialCommunication(); // Initialize serial communication

initRTC(); // Initialize Real Time Clock

initSDcard(); // Initialize SD card

initOneWire(); // Initialize OneWire devices

Serial.println();

Serial.println(F("LOGGER IS RUNNING:"));

repetitiveStrings();

}

// The loop function runs over and over again forever

void loop ()

{

readClock(); // Read clock and store current time and date into the following variables: second, minute, hour, dayOfTheWeek, day, month and year

if(Serial.available())

{

if (Serial.peek() == 'p')

{

Serial.read(); // Clear serial buffer

Serial.println(F("- Printing current time, date and temperature -"));

printTime(); // Print hour, minute and second in Serial Monitor

Serial.print(F(" | "));

printDate(); // Print day, month, year and weekday in Serial Monitor

Serial.println();

sensors.requestTemperatures();

Serial.print(F("Device 0 Temperature: "));

printTemperatureInC(temperatureSensor1); // Print the temperature of a device in ºC in Serial Monitor

Serial.print(F("Device 1 Temperature: "));

printTemperatureInC(temperatureSensor2); // Print the temperature of a device in ºC in Serial Monitor

Serial.print(F("Device 2 Temperature: "));

printTemperatureInC(temperatureSensor3); // Print the temperature of a device in ºC in Serial Monitor

Serial.println();

repetitiveStrings();

}

else if (Serial.peek() == 't')

{

Serial.read(); // Clear serial buffer

Serial.println(F("- Entering time setup -"));

Serial.print(F("Current time: "));

printTime();

Serial.println();

setHour();

setMinute();

setSecond();

Serial.print(F("Current time: "));

printTime();

Serial.println();

repetitiveStrings();

}

else if (Serial.peek() == 'd')

{

Serial.read(); // Clear serial buffer

Serial.println(F("- Entering date setup -"));

Serial.print(F("Current date: "));

printDate();

Serial.println();

setDay();

setMonth();

setYear();

Serial.print(F("Current date: "));

printDate();

Serial.println();

repetitiveStrings();

}

else if (Serial.peek() == 'u')

{

Serial.read(); // Clear serial buffer

Serial.println(F("- SD card unmounting -"));

Serial.print(F("SD card unmounted"));

SD.end();

Serial.println();

repetitiveStrings();

}

else if (Serial.peek() == 'm')

{

Serial.read(); // Clear serial buffer

Serial.println(F("- SD card mounting -"));

Serial.print(F("SD card mounted"));

SD.begin(chipSelect);

Serial.println();

repetitiveStrings();

}

else if (Serial.peek() != 'p' || Serial.peek() != 't' || Serial.peek() != 'd' || Serial.peek() != 'u' || Serial.peek() != 'm')

{

Serial.read(); // Clear serial buffer

Serial.println(F("- Char not accepted -"));

repetitiveStrings();

}

while (Serial.read() >= 0){;} // Flush remaining characters

}

if (digitalRead(cardDetect) == LOW && second%10 == 0 && previous_second != second)

{

temperatureLogger();

previous_second = second;

}

if (digitalRead(cardDetect) == HIGH && second%10 == 0 && previous_second != second)

{

Serial.println(F("- Datalog status -"));

Serial.println(F("Failed - SD card was removed"));

Serial.println();

SD.end();

previous_second = second;

}

// Print hour, minute and second in Serial Monitor

void printTime (void)

{

DateTime now = RTC.now();

// Print hour in Serial Monitor

if (now.hour() <= 9)

{

Serial.print(F("0")); Serial.print(now.hour(), DEC); Serial.print(F(":"));

}

else { Serial.print(now.hour(), DEC); Serial.print(F(":")); }

// Print minute in Serial Monitor

if (now.minute() <= 9)

{

Serial.print(F("0")); Serial.print(now.minute(), DEC); Serial.print(F(":"));

}

else { Serial.print(now.minute(), DEC); Serial.print(F(":")); }

// Print second in Serial Monitor

if (now.second() <= 9)

{

Serial.print(F("0")); Serial.print(now.second(), DEC);

}

else { Serial.print(now.second(), DEC); }

}

// Print day, month, year and weekday in Serial Monitor

void printDate (void)

{

DateTime now = RTC.now();

// Print day in Serial Monitor

if (now.day() <= 9)

{

Serial.print(F("0")); Serial.print(now.day(), DEC); Serial.print(F("/"));

}

else { Serial.print(now.day(), DEC); Serial.print(F("/")); }

// Print month in Serial Monitor

switch(now.month())

{

case 1: Serial.print(F("Jan/")); break;

case 2: Serial.print(F("Feb/")); break;

case 3: Serial.print(F("Mar/")); break;

case 4: Serial.print(F("Apr/")); break;

case 5: Serial.print(F("May/")); break;

case 6: Serial.print(F("Jun/")); break;

case 7: Serial.print(F("Jul/")); break;

case 8: Serial.print(F("Aug/")); break;

case 9: Serial.print(F("Sep/")); break;

case 10: Serial.print(F("Oct/")); break;

case 11: Serial.print(F("Nov/")); break;

case 12: Serial.print(F("Dec/")); break;

default: Serial.print(F("Err/"));

}

// Print year in Serial Monitor

Serial.print(now.year(), DEC);

// Print weekday in Serial Monitor

switch(now.dayOfTheWeek())

{

case 0: Serial.print(F(" | Sunday")); break;

case 1: Serial.print(F(" | Monday")); break;

case 2: Serial.print(F(" | Tuesday")); break;

case 3: Serial.print(F(" | Wednesday")); break;

case 4: Serial.print(F(" | Thursday")); break;

case 5: Serial.print(F(" | Friday")); break;

case 6: Serial.print(F(" | Saturday")); break;

default: Serial.print(F(" | Error"));

}

// Read clock and store current time and date into the following variables: second, minute, hour, dayOfTheWeek, day, month and year

void readClock(void)

{

Wire.beginTransmission(DS1307_I2C_ADDRESS);

Wire.write(0x00);

Wire.endTransmission();

Wire.requestFrom(DS1307_I2C_ADDRESS, 7);

second = bcdToDec(Wire.read());

minute = bcdToDec(Wire.read());

hour = bcdToDec(Wire.read());

dayOfTheWeek = bcdToDec(Wire.read());

day = bcdToDec(Wire.read());

month = bcdToDec(Wire.read());

year = bcdToDec(Wire.read());

}

// Function to adjust the RTC

void adjustClock (unsigned char address, unsigned int clockVariable)

{

Wire.beginTransmission(DS1307_I2C_ADDRESS);

Wire.write(address);

Wire.write(decToBcd(clockVariable));

Wire.endTransmission();

Serial.println(F("Valid"));

Serial.read(); // Clear serial buffer

counter=maxcounter;

flag=1;

}

// Set hour

void setHour (void)

{

flag=0;

counter=0;

Serial.print(F("Enter hour [0,23]: "));

if (Serial.available() == 0)

{

for (counter=0 ; counter <=maxcounter ; counter++)

{

delay(1);

// Do not accept the entry if the introduced char is not a number (48 and 57 represents digit 0 and 9 in ASCII, respectively)

if ( (Serial.peek() >= 0 && Serial.peek() <= 47) || (Serial.peek() >= 58 && Serial.peek() <= 255) )

{

Serial.read(); // Clear serial buffer

Serial.println(F("Not valid"));

setHour();

}

if ( Serial.peek() >= 48 && Serial.peek() <= 57 )

{

hour = Serial.parseInt();

if (hour >= 0 && hour <= 23)

{adjustClock (0x02, hour);}

else {Serial.println(F("Not Valid")); Serial.read(); setHour();}

}

if (flag == 0)

{

flag=1;

Serial.read(); // Clear serial buffer

Serial.println(F("Unchanged"));

}

// Set minute

void setMinute (void)

{

flag=0;

counter=0;

Serial.print(F("Enter minute [0,59]: "));

if (Serial.available() == 0)

{

for (counter=0 ; counter <=maxcounter ; counter++)

{

delay(1);

// Do not accept the entry if the introduced char is not a number (48 and 57 represents digit 0 and 9 in ASCII, respectively)

if ( (Serial.peek() >= 0 && Serial.peek() <= 47) || (Serial.peek() >= 58 && Serial.peek() <= 255) )

{

Serial.read(); // Clear serial buffer

Serial.println(F("Not valid"));

setMinute();

}

if ( Serial.peek() >= 48 && Serial.peek() <= 57 )

{

minute = Serial.parseInt();

if (minute >= 0 && minute <= 59)

{adjustClock (0x01, minute);}

else {Serial.println(F("Not Valid")); Serial.read(); setMinute();}

}

if (flag == 0)

{

flag=1;

Serial.read(); // Clear serial buffer

Serial.println(F("Unchanged"));

}

// Set second

void setSecond (void)

{

flag=0;

counter=0;

Serial.print(F("Enter second [0,59]: "));

if (Serial.available() == 0)

{

for (counter=0 ; counter <=maxcounter ; counter++)

{

delay(1);

// Do not accept the entry if the introduced char is not a number (48 and 57 represents digit 0 and 9 in ASCII, respectively)

if ( (Serial.peek() >= 0 && Serial.peek() <= 47) || (Serial.peek() >= 58 && Serial.peek() <= 255) )

{

Serial.read(); // Clear serial buffer

Serial.println(F("Not valid"));

setSecond();

}

if ( Serial.peek() >= 48 && Serial.peek() <= 57 )

{

second = Serial.parseInt();

if (second >= 0 && second <= 59)

{adjustClock (0x00, second);}

else {Serial.println(F("Not Valid")); Serial.read(); setSecond();}

}

if (flag == 0)

{

flag=1;

Serial.read(); // Clear serial buffer

Serial.println(F("Unchanged"));

}

// Set day

void setDay (void)

{

flag=0;

counter=0;

Serial.print(F("Enter day [1,31]: "));

if (Serial.available() == 0)

{

for (counter=0 ; counter <=maxcounter ; counter++)

{

delay(1);

// Do not accept the entry if the introduced char is not a number (48 and 57 represents digit 0 and 9 in ASCII, respectively)

if ( (Serial.peek() >= 0 && Serial.peek() <= 47) || (Serial.peek() >= 58 && Serial.peek() <= 255) )

{

Serial.read(); // Clear serial buffer

Serial.println(F("Not valid"));

setDay();

}

if ( Serial.peek() >= 48 && Serial.peek() <= 57 )

{

day = Serial.parseInt();

if (day >= 1 && day <= 31 && (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12))

{adjustClock (0x04, day);}

else if (day >= 1 && day <= 30 && (month == 4 || month == 6 || month == 9 || month == 11))

{adjustClock (0x04, day);}

else if (day >= 1 && day <= 29 && month == 2 && year%4 == 0)

{adjustClock (0x04, day);}

else if (day >= 1 && day <= 28 && month == 2 && year%4 != 0)

{adjustClock (0x04, day);}

else {Serial.println(F("Not Valid")); Serial.read(); setDay();}

}

if (flag == 0)

{

flag=1;

Serial.read(); // Clear serial buffer

Serial.println(F("Unchanged"));

}

// Set month

void setMonth (void)

{

flag=0;

counter=0;

Serial.print(F("Enter month [1,12]: "));

if (Serial.available() == 0)

{

for (counter=0 ; counter <=maxcounter ; counter++)

{

delay(1);

// Do not accept the entry if the introduced char is not a number (48 and 57 represents digit 0 and 9 in ASCII, respectively)

if ( (Serial.peek() >= 0 && Serial.peek() <= 47) || (Serial.peek() >= 58 && Serial.peek() <= 255) )

{

Serial.read(); // Clear serial buffer

Serial.println(F("Not valid"));

setMonth();

}

if ( Serial.peek() >= 48 && Serial.peek() <= 57 )

{

month = Serial.parseInt();

if (month == 1 && day >= 1 && day <= 31 )

{adjustClock (0x05, month);}

else if (month == 2 && day >= 1 && day <= 29 && year%4 == 0)

{adjustClock (0x05, month);}

else if (month == 2 && day >= 1 && day <= 28 && year%4 != 0)

{adjustClock (0x05, month);}

else if (month == 3 && day >= 1 && day <= 31 )

{adjustClock (0x05, month);}

else if (month == 4 && day >= 1 && day <= 30 )

{adjustClock (0x05, month);}

else if (month == 5 && day >= 1 && day <= 31 )

{adjustClock (0x05, month);}

else if (month == 6 && day >= 1 && day <= 30 )

{adjustClock (0x05, month);}

else if (month == 7 && day >= 1 && day <= 31 )

{adjustClock (0x05, month);}

else if (month == 8 && day >= 1 && day <= 31 )

{adjustClock (0x05, month);}

else if (month == 9 && day >= 1 && day <= 30 )

{adjustClock (0x05, month);}

else if (month == 10 && day >= 1 && day <= 31 )

{adjustClock (0x05, month);}

else if (month == 11 && day >= 1 && day <= 30 )

{adjustClock (0x05, month);}

else if (month == 12 && day >= 1 && day <= 31 )

{adjustClock (0x05, month);}

else {Serial.println(F("Not Valid")); Serial.read(); setMonth();}

}

if (flag == 0)

{

flag=1;

Serial.read(); // Clear serial buffer

Serial.println(F("Unchanged"));

}

// Set year

void setYear (void)

{

flag=0;

counter=0;

Serial.print(F("Enter year [2014,2030]: "));

if (Serial.available() == 0)

{

for (counter=0 ; counter <=maxcounter ; counter++)

{

delay(1);

// Do not accept the entry if the introduced char is not a number (48 and 57 represents digit 0 and 9 in ASCII, respectively)

if ( (Serial.peek() >= 0 && Serial.peek() <= 47) || (Serial.peek() >= 58 && Serial.peek() <= 255) )

{

Serial.read(); // Clear serial buffer

Serial.println(F("Not valid"));

setYear();

}

if ( Serial.peek() >= 48 && Serial.peek() <= 57 )

{

year_2000 = Serial.parseInt();

if (year_2000 >= 2014 && year_2000 <= 2030)

{year = year_2000 - 2000; adjustClock (0x06, year);}

else {Serial.println(F("Not Valid")); Serial.read(); setYear();}

}

if (flag == 0)

{

flag=1;

Serial.read(); // Clear serial buffer

Serial.println(F("Unchanged"));

}

// Repetitive strings

void repetitiveStrings(void)

{

Serial.println(F("Type 'p' to print current time, date and temperature"));

Serial.println(F("Type 't' or 'd' to setup the time or date"));

Serial.println(F("Type 'm' or 'u' to mount or unmount the SD card"));

Serial.println();

}

// Write time, date and temperature into the datalog file

void temperatureLogger(void)

{

DateTime now = RTC.now();

sensors.requestTemperatures();

// Open the file. Keep in mind that only one file can be open at a time, so you have to close this one before opening another.

myFile = SD.open("datalog.txt", FILE_WRITE);

if (!myFile)

{

Serial.println(F("- Datalog status -"));

Serial.println(F("Failed - SD card was unmounted"));

Serial.println();

}

else if (myFile)

{

// Write hour into the datalog file

if (now.hour() <= 9)

{

myFile.print(F("0")); myFile.print(now.hour(), DEC); myFile.print(F(":"));

}

else { myFile.print(now.hour(), DEC); myFile.print(F(":")); }

// Write minute into the datalog file

if (now.minute() <= 9)

{

myFile.print(F("0")); myFile.print(now.minute(), DEC); myFile.print(F(":"));

}

else { myFile.print(now.minute(), DEC); myFile.print(F(":")); }

// Write second into the datalog file

if (now.second() <= 9)

{

myFile.print(F("0")); myFile.print(now.second(), DEC);

}

else { myFile.print(now.second(), DEC); }

// Write day into the datalog file

myFile.print(F(" | "));

if (now.day() <= 9)

{

myFile.print(F("0")); myFile.print(now.day(), DEC); myFile.print(F("/"));

}

else { myFile.print(now.day(), DEC); myFile.print(F("/")); }

// Write month into the datalog file

switch(now.month())

{

case 1: myFile.print(F("Jan/")); break;

case 2: myFile.print(F("Feb/")); break;

case 3: myFile.print(F("Mar/")); break;

case 4: myFile.print(F("Apr/")); break;

case 5: myFile.print(F("May/")); break;

case 6: myFile.print(F("Jun/")); break;

case 7: myFile.print(F("Jul/")); break;

case 8: myFile.print(F("Aug/")); break;

case 9: myFile.print(F("Sep/")); break;

case 10: myFile.print(F("Oct/")); break;

case 11: myFile.print(F("Nov/")); break;

case 12: myFile.print(F("Dec/")); break;

default: myFile.print(F("Err/"));

}

// Write year into the datalog file

myFile.print(now.year(), DEC);

// Write weekday into the datalog file

switch(now.dayOfTheWeek())

{

case 0: myFile.println(F(" | Sunday")); break;

case 1: myFile.println(F(" | Monday")); break;

case 2: myFile.println(F(" | Tuesday")); break;

case 3: myFile.println(F(" | Wednesday")); break;

case 4: myFile.println(F(" | Thursday")); break;

case 5: myFile.println(F(" | Friday")); break;

case 6: myFile.println(F(" | Saturday")); break;

default: myFile.println(F(" | Error"));

}

// Write temperatures into the datalog file

myFile.print(F("Device 0 Temperature: "));

writeTemperatureInC(temperatureSensor1);

myFile.print(F("Device 1 Temperature: "));

writeTemperatureInC(temperatureSensor2);

myFile.print(F("Device 2 Temperature: "));

writeTemperatureInC(temperatureSensor3);

myFile.println();

myFile.close();

Serial.println(F("- Datalog status -"));

Serial.println(F("OK"));

Serial.println();

}

// Print the address of a device in Serial Monitor

void printAddress(DeviceAddress deviceAddress)

{

for (uint8_t i = 0; i < 8; i++)

{

// Zero pad the address if necessary

if (deviceAddress[i] < 16) Serial.print(F("0"));

Serial.print(deviceAddress[i], HEX);

}

// Print the resolution of a device in Serial Monitor

void printResolution(DeviceAddress deviceAddress)

{

Serial.print(sensors.getResolution(deviceAddress), DEC);

Serial.println(F(" bit"));

}

// Print the temperature of a device in ºC in Serial Monitor

void printTemperatureInC(DeviceAddress deviceAddress)

{

float tempC = sensors.getTempC(deviceAddress);

Serial.print(tempC);

Serial.println(F(" degrees Celsius"));

}

// Write the temperature of a device in ºC into the SD memory card

void writeTemperatureInC(DeviceAddress deviceAddress)

{

float tempC = sensors.getTempC(deviceAddress);

myFile.print(tempC);

myFile.println(F(" degrees Celsius"));

}

// Initialize serial communication

void initSerialCommunication()

{

Serial.print(F("Serial communication: "));

if (!Serial)

{Serial.println(F("Failed")); delay(7000); initSerialCommunication();}

else Serial.println(F("OK"));

}

// Initialize Real Time Clock

void initRTC()

{

//RTC.adjust(DateTime(__DATE__, __TIME__)); // This line sets the RTC to the date and time this sketch was compiled

Serial.print(F("RTC: "));

if (!RTC.isrunning()) // If the clock is not running, execute the following code

{

Serial.print(F("Not Running! Restarting the RTC. "));

// Starts ticking the clock

Wire.beginTransmission(DS1307_I2C_ADDRESS);

Wire.write(0x00); // Move pointer to 0x00 byte address

Wire.write(0x00); // Sends 0x00. The whole byte is set to zero (0x00). This also means seconds will reset!! Unless you use a mask -> homework :)

Wire.endTransmission();

// Following line sets the RTC to the date & time to: 2015 January 01 - 00:00:00

RTC.adjust(DateTime(2015,1,1, 0,0,0)); // Sequence: year, month, day, hour, minute, second

}

if (RTC.isrunning())

{Serial.println(F("OK"));}

if (!RTC.isrunning())

{Serial.println(F("Failed")); delay(7000); initRTC();}

}

// Initialize SD card

void initSDcard()

{

Serial.print(F("SD card: "));

pinMode(SS, OUTPUT); // On the Ethernet Shield, Chip Select (CS) is pin 4. It's set as an output by default.

// Note that even if it's not used as the CS pin, the hardware SS pin

// (10 on most Arduino boards, 53 on the Mega) must be left as an output or the SD library functions will not work.

if (!SD.begin(chipSelect))

{Serial.println(F("Failed")); delay(7000); initSDcard();}

else Serial.println(F("OK"));

}

// Initialize OneWire devices

void initOneWire()

{

Serial.println();

Serial.println(F("DETECTING ONEWIRE DEVICES:")); // Detect all OneWire devices

// Find all devices on the bus

Serial.print(F("Devices found: "));

Serial.println(sensors.getDeviceCount(), DEC);

// Search for all devices on the bus and assign them based on an index.

if (!sensors.getAddress(temperatureSensor1, 0)) Serial.println(F("Unable to find address for Device 0"));

if (!sensors.getAddress(temperatureSensor2, 1)) Serial.println(F("Unable to find address for Device 1"));

if (!sensors.getAddress(temperatureSensor3, 2)) Serial.println(F("Unable to find address for Device 2"));

// Set the resolution of the temperature sensors

sensors.setResolution(temperatureSensor1, TEMPERATURE_PRECISION);

sensors.setResolution(temperatureSensor2, TEMPERATURE_PRECISION);

sensors.setResolution(temperatureSensor3, TEMPERATURE_PRECISION);

// Print the address and resolution of the temperature sensors found on the bus

Serial.print(F("Device 0 Address/Resolution: "));

printAddress(temperatureSensor1);

Serial.print(F(" / "));

printResolution(temperatureSensor1);

Serial.print(F("Device 1 Address/Resolution: "));

printAddress(temperatureSensor2);

Serial.print(F(" / "));

printResolution(temperatureSensor2);

Serial.print(F("Device 2 Address/Resolution: "));

printAddress(temperatureSensor3);

Serial.print(F(" / "));

printResolution(temperatureSensor3);

// Is parasite power being used? For more information about parasite power you must read the datasheet of the DS18B20 temperature sensor

Serial.print(F("Parasite power is: "));

if (sensors.isParasitePowerMode()) Serial.println(F("ON"));

else Serial.println(F("OFF"));

}

// Print free SRAM in Serial Monitor

uint16_t freeMem()

{

char top;

extern char *__brkval;

extern char __bss_end;

Serial.print(F("Available SRAM: "));

Serial.print( __brkval ? &top - __brkval : &top - &__bss_end);

Serial.println(F(" bytes"));

}

Serial Monitor: