#include "max6675.h"
#include "LiquidCrystal_I2C.h"
#include "Wire.h"
#include "Keypad.h"

LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);

long setTemp = 0;
long tempTol = 3;

const byte numRows = 4;
const byte numCols = 4;

char keymap[numRows][numCols] = 
{
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
}; 
//letting arduino to identify pad bottons

byte rowPins[numRows] = {9,8,7,6};
byte colPins[numCols] = {5,4,3,2};

int ktcSO = 11;
int ktcCLK = 12;
int ktcCS = A0;
MAX6675 ktc(ktcCLK, ktcCS, ktcSO);

Keypad keypad = Keypad( makeKeymap(keymap), rowPins, colPins, numRows, numCols );

char key = keypad.getKey();

void setup() {
  // put your setup code here, to run once:
  pinMode(10,OUTPUT);
  Serial.begin(9600); //Start serial
  lcd.begin(16,2); //Set the available spaces
  lcd.noAutoscroll();
  lcd.setCursor(0,1); //Set the cursor to the next row
  lcd.print("Set (C):"); //This the temp. that was set
  lcd.setCursor(0,2); //Set the cursor to the next row
  lcd.print("Temp(C):"); //This is the current temp.
  lcd.setCursor(8,2);
  lcd.print(ktc.readCelsius());
  }

void loop() {
  // put your main code here, to run repeatedly:
  
  goto TempSetting;
 
  MainA:{
    if (key = 'C') 
    {
      lcd.setCursor(8,2);
      lcd.print("              ");
      digitalWrite(10,LOW);
      setTemp = 0;
      goto TempSetting;
    }
    else {
          if ((ktc.readCelsius()) > setTemp + tempTol)
            {
             digitalWrite(10,LOW);
            }
            else {
                  if ((ktc.readCelsius()) < setTemp + tempTol)
                    {
                      digitalWrite(10,HIGH);
                    }
                    else {
                          goto MainA;
                         }
                  }
           }
  }
  TempSetting:{
        lcd.setCursor(8,2);
        lcd.print(ktc.readCelsius());
        lcd.setCursor(8,1);
    switch(key)
  {
    case '0' ... '9':
      {
        delay(20);
        lcd.setCursor(8,1);
        setTemp = setTemp * 10 + (key);
        lcd.print(setTemp);
        break;
      }
    case 'A' :
      {
        lcd.setCursor(8,2);
        lcd.print("                ");
        lcd.setCursor(8,2);
        lcd.print(ktc.readCelsius());
        delay(750);
        digitalWrite(10,HIGH);
        goto MainA;
      }
  }
 }
}