#include <max6675.h>
//#include "max6675.h"
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

int thermoDO = 12;
int thermoCS = 10;
int thermoCLK = 13;
MAX6675 thermocouple(thermoCLK, thermoCS, thermoDO);

// Button configuration
const int
DECREMENT_BTN_PIN = 7,
INCREMENT_BTN_PIN = 8;

// "Heater" and "cooler" configuration
const int
RELAY_PIN = 4,
COOLER_PIN = 4;

int relayState = digitalRead(RELAY_PIN);

//----------------------------------------------------------------------------
// Controls
int targetC =100;       // why Target Set....must Follow whatever Setpoint is????
//------------------------------------------------------------------------------------------------
void setup() {
  // Serial (for logging)
  Serial.begin (9600);
  Serial.print("setup()\n");

  // LCD
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.backlight();      // Make sure backlight is on
  Serial.print("\tLCD initialized\n");

  // Buttons
  pinMode(INCREMENT_BTN_PIN, INPUT_PULLUP);
  pinMode(DECREMENT_BTN_PIN, INPUT_PULLUP);

  // Temperature Controllers
  pinMode(RELAY_PIN, OUTPUT);

}
//------------------------------------------------------------------------------------------------
void loop() {

  // Read Button State
  bool incrementTarget = digitalRead(INCREMENT_BTN_PIN);
  bool decrementTarget = digitalRead(DECREMENT_BTN_PIN);
  bool wait = incrementTarget || decrementTarget;

  // Configure
  if (incrementTarget) {
    targetC += 10;
  }
  //  if (targetC > 250 ){targetC = 250;}
  if (decrementTarget) {
    targetC -= 10;
  }
  //  if (targetC < 10 ) {targetC = 10;}
  const char symbol = 'C';
  const int target = targetC;
//------------------------------------------------------------------------------
  // Read Sensor Data
  float temperature = thermocouple.readCelsius();// return Celsius
  Serial.print("\t" + String(temperature) + "°" + symbol + "% \n");
//-----------------------------------------------------------------------------

  // Write out to LCD
  lcd.setCursor(0, 0);
  Serial.print ("Temp: " + String(temperature));
  lcd.print ("Temp:  ");
  lcd.print(round(temperature));
  lcd.print(" / ");
  Serial.print ("Target: " + String(target) + ".00" + symbol);
  lcd.print (target);

  // Activate Temperature Control
  if (round(target) > round(temperature)) 
  digitalWrite(RELAY_PIN, LOW);

  else //digitalWrite(HEATER_PIN, LOW);


    if (round(target) < round(temperature)) 
    digitalWrite(RELAY_PIN, HIGH);

int relayState = digitalRead(4);
if (relayState == HIGH)
{
  Serial.println("LOW");
} else {
  Serial.println("HIGH");
}
lcd.setCursor(0, 1);
if (relayState== HIGH)
{
  lcd.print ("Relay OFF");

} else {
  
  lcd.print ("Relay  ON");
  
}
  // Pause to allow finger to lift from button(s)
  if (wait) delay(500);
}