TempLogger

// -----------------------------------------------------------------

#include <OneWire.h>
#include <DallasTemperature.h>
#include <SPI.h>
#include <SD.h>

// Data wire is plugged into pin 7 on the Arduino
#define ONE_WIRE_BUS 7

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

// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);
float temperature = 0.0;

// -----------------------------------------------------------------

#include <LiquidCrystal.h>

// Connections:
// rs (LCD pin 4) to Arduino pin 12
// rw (LCD pin 5) to Arduino pin 11
// enable (LCD pin 6) to Arduino pin 10
// LCD pin 15 to Arduino pin 13
// LCD pins d4, d5, d6, d7 to Arduino pins 5, 4, 3, 2
LiquidCrystal lcd(12, 11, 10, 5, 4, 3, 2);

int backLight = 13;    // pin 13 will control the backlight

// -----------------------------------------------------------------

//SD card
const int sdPin = 9;
File logFile;

// -----------------------------------------------------------------

void setup(void)
{
  // start serial port
  Serial.begin(9600);
  Serial.println("Dallas Temperature IC Control");
  // Start up the library
  sensors.begin();

  pinMode(backLight, OUTPUT);
  digitalWrite(backLight, HIGH); // turn backlight on. Replace 'HIGH' with 'LOW' to turn it off.
  lcd.begin(16,2);              // columns, rows.  use 16,2 for a 16x2 LCD, etc.
  lcd.clear();                  // start with a blank screen
  lcd.setCursor(0,0);           // set cursor to column 0, row 0 (the first row)
  lcd.print("Dallas Temperature IC Control");    // change this text to whatever you like. keep it clean.
  lcd.setCursor(0,1);           // set cursor to column 0, row 1
  lcd.print("DS18B20");
  delay(1000);

  if(!SD.begin(sdPin)) {
    Serial.println("Failed to initialize SD card");
//    lcd.setCursor(0,0);
//    lcd.println("Init SD failed  ");
  } else {
    Serial.println("SD initialized.");
//    lcd.setCursor(0,0);
//    lcd.println("Init SD success ");
  }
  delay(1000);
}


void loop(void)
{
  // call sensors.requestTemperatures() to issue a global temperature
  // request to all devices on the bus
  Serial.print(" Requesting temperatures...");
  sensors.requestTemperatures(); // Send the command to get temperatures
  Serial.println("DONE");
  temperature = sensors.getTempCByIndex(0);

  Serial.print("Temperature for Device 1 is: ");
  Serial.println(temperature); // Why "byIndex"?
    // You can have more than one IC on the same bus.
    // 0 refers to the first IC on the wire
  lcd.setCursor(0,0);
  lcd.print(temperature);
  lcd.print("*C         ");
  lcd.setCursor(0,1);
  lcd.print(millis()/1000);
  lcd.print(" sec                 ");

  logFile = SD.open("cookLog.txt", FILE_WRITE);
  logFile.print(millis());
  logFile.print("\t");
  logFile.println(temperature);
  logFile.close();
}