//Jeremy Blum's Arduino Tutorial Series - Episode 13 - LCDs
//Sample Code - LCD Temperature Display
//http://www.jeremyblum.com
//Debouncing code from Tutorial 2: http://jeremyblum.com/2011/01/10/arduino-tutorial-2-now-with-more-blinky-things/
//I2C Code from Tutorial 7: http://jeremyblum.com/2011/02/13/arduino-tutorial-7-i2c-and-processing/
//LiquidCrystal library by David A. Mellis, Limor Fried (http://www.ladyada.net), and Tom Igoe
//http://www.arduino.cc/en/Tutorial/LiquidCrystal

//Include Wire I2C Library
//#include  <Wire.h>        flag
#include  <OneWire.h>

//int temp_address = 72;    flag

OneWire ds(SensorPin);


int SensorPin = 7;


// include the library code:
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(8, 9, 10, 11, 12, 13);


byte degree[8] = {
  B00110,
  B01001,
  B01001,
  B00110,
  B00000,
  B00000,
  B00000,
};

int switchPin = 16;
boolean lastButton = LOW;
boolean currentButton = LOW;
boolean celcius = true;

void setup() {
  //Mode Button
  pinMode(switchPin, INPUT);

   //Create a Wire Object
  //Wire.begin();

  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("ROOM TEMPERATURE");

  lcd.setCursor(11,1);
  lcd.print("mode>");

  //Make progress characters
  lcd.createChar(0, degree);
}

boolean debounce(boolean last)
{
  boolean current = digitalRead(switchPin);
  if (last != current)
  {
    delay(5);
    current = digitalRead(switchPin);
  }
  return current;
}

void loop() {

  //Handle Temperature
  //Send Request
//  Wire.beginTransmission(temp_address); //Start talking        flag
//  Wire.write(0); //Ask for Register zero
//  Wire.endTransmission(); //Complete Transmission
//  Wire.requestFrom(temp_address, 1); //Request 1 Byte
//  while(Wire.available() == 0); //wait for response
//  int c = Wire.read(); // Get the temp in c
//  //do some math...                 flag

float c = getTemp();
int f = round(c*9.0/5.0 +32.0);                          //    flag

delay(100);

  currentButton = debounce(lastButton);
  if (lastButton == LOW && currentButton == HIGH)
  {
    if (celcius) celcius = false;
    else celcius = true;

    //Erase old characters
    lcd.setCursor(0,1);
    lcd.print("           ");
  }
  lastButton = currentButton;


 lcd.setCursor(1,1);
 if (celcius)
 {
   lcd.print(c);
   lcd.write((byte)0);
   lcd.print("C");
 }
 else
 {
   lcd.print(f);
   lcd.write((byte)0);
   lcd.print("F");
 }
//Serial.println(temp);

delay(100);

}


float getTemp(){
  //returns the temperature from one DS18S20 in DEG Celsius

  byte data[12];
  byte addr[8];

 // if ( !ds.search(addr)) {
      //no more sensors on chain, reset search
 //     ds.reset_search();
//return -1000;
 // }

//  if ( OneWire::crc8( addr, 7) != addr[7]) {
     // Serial.println("CRC is not valid!");
      //return -1000;
//  }

  //if ( addr[0] != 0x10 && addr[0] != 0x28) {
    //  Serial.print("Device is not recognized");
     // return -1000;
 // }

  ds.reset();
  ds.select(addr);
  ds.write(0x44,1); // start conversion, with parasite power on at the end

  byte present = ds.reset();
  ds.select(addr);
  ds.write(0xBE); // Read Scratchpad


  for (int i = 0; i < 9; i++) { // we need 9 bytes
    data[i] = ds.read();
  }

  ds.reset_search();

  byte MSB = data[1];
  byte LSB = data[0];

  float tempRead = ((MSB << 8) | LSB); //using two's compliment
  float TemperatureSum = tempRead / 16;

  return TemperatureSum;





}