// Original library source:
// www.ladyada.net/learn/sensors/thermocouple
/*
 * Arduino code to read temperature using two MAX6675 chips and K-type thermocouples
 * and display on one LCD1602 I2C display
 * 
 * Watch video instructions for this code: https://youtu.be/c90NszbNG8c
 * 
 * Download this code from Robojax.com
 *  
 * Updated by Ahmad Shamshiri for Robojax.com on Saturday, November 24, 2018
 * in Ajax, Ontario, Canada
 Updated on February 2, 2021, on request of Raphael M. under https://youtu.be/c90NszbNG8c
 * 
 You can get the wiring diagram and full explanation from my Arduino Course at Udemy.com.
 Learn Arduino step by step with all libraries, codes, and wiring diagrams all in one place.
 Visit my course now: http://robojax.com/L/?id=62

 If you found this tutorial helpful, please support me so I can continue creating 
 content like this. You can support me on Patreon: http://robojax.com/L/?id=63
 or make a donation using PayPal: http://robojax.com/L/?id=64

 * 
 * Code is available at: http://robojax.com/learn/arduino

 * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.
 * This code has been downloaded from Robojax.com
    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 <https://www.gnu.org/licenses/>. 
 */


#include "max6675.h"

// start of settings for LCD1602 with I2C
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd1(0x3F, 16, 2);// I2C address is 0x3F


// pins for first thermocouple
int so1Pin = 4;// SO1=Serial Out
int cs1Pin = 5;// CS1 = chip select CS pin
int sck1Pin = 6;// SCK1 = Serial Clock pin

// pins for 2nd thermocouple
int so2Pin = 8;// SO1=Serial Out
int cs2Pin = 9;// CS1 = chip select CS pin
int sck2Pin = 10;// SCK1 = Serial Clock pin


MAX6675 thermocouple1(sck1Pin, cs1Pin, so1Pin);// watch video for details
MAX6675 thermocouple2(sck2Pin, cs2Pin, so2Pin);// watch video for details

void setup() {
  // Robojax.com Dual display, dual thermocouple 20181122
  lcd1.begin();// initialize the LCD1602(LCD1)
  lcd1.backlight();// turn the backlight ON for the LCD(LCD1)

  lcd2.begin();// initialize the LCD1602 (LCD2)
  lcd2.backlight();// turn the backlight ON for the LCD  (LCD2)
  
      lcd1.print("Robojax MAX6675");//(LCD1)
      lcd1.setCursor(0,1);//(LCD1)
      lcd1.print("2 Thermocouples");//(LCD1) 

       
          
  Serial.begin(9600);// initialize serial monitor with 9600 baud
  Serial.println("Robojax MAX6675"); 
    
 delay(3000);// give time to user to read the display at the beginning
}

void loop() {
  // basic readout test, just print the current temp
  //see video for details https://youtu.be/c90NszbNG8c
   Serial.print("C_1 = "); 
   Serial.print (thermocouple1.readCelsius());
   Serial.print(" F_1 = ");
   Serial.println(thermocouple1.readFahrenheit());

   Serial.print("C_2 = "); 
   Serial.print (thermocouple2.readCelsius());
   Serial.print(" F_2 = ");
   Serial.println(thermocouple2.readFahrenheit());
   
  lcd1.clear();// clear previous values from screen (1)
  lcd2.clear();// clear previous values from screen (2) 
    
      lcd1.setCursor(0,0);// set cursor at character 0, line 1       
      lcd1.print("Tmp-1: ");

      lcd1.setCursor(8,0);// set cursor at character 8, line 1
      lcd1.print(thermocouple1.readCelsius()); // print temperature in Celsius for  thermocouple1
      lcd1.setCursor(13,0);// set cursor at character 13, line 1
      lcd1.print((char)223); 
      lcd1.print("C");    
                  
      lcd1.setCursor(0,0);// set cursor at character 0, line 2       
      lcd1.print("Tmp-1: ");

      lcd1.setCursor(8,0);// set cursor at character 8, line 2
      lcd1.print(thermocouple1.readCelsius()); // print temperature in Celsius for  thermocouple1
      lcd1.setCursor(13,0);// set cursor at character 13, line 2
      lcd1.print((char)223); 
      lcd1.print("C");     
          
   delay(1000);
}