Other Arduino Codes and Videos by Robojax
In this tutorial we learn how to use K-Type Thermonuclear with MAX6675 module to use it as Heater Control or Cooler Control by using a relay. With the provided code, the project can be set to work as Cooler or Heater controller and the temperature value can be set in any unit C, F or K.
/*
* Library from : // www.ladyada.net/learn/sensors/thermocouple
*
* This is Arduino code to measure MAX6675 Thermocoupler K-Type sensor
* and control realy as Heater or cooler
*
* Watch Video instrution for this code: https://youtu.be/dVh77wT-4Ao
*
* Full explanation of this code and wiring diagram is available at
* my Arduino Course at Udemy.com here: http://robojax.com/L/?id=62
* Written by Ahmad Shamshiri on May 20, 2020 at in Ajax, Ontario, Canada
* in Ajax, Ontario, Canada. www.robojax.com
*
* Get this code and other Arduino codes from Robojax.com
Learn Arduino step by step in structured course with all material, wiring diagram and library
all in once place. Purchase My course on Udemy.com http://robojax.com/L/?id=62
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Related videos:
Introduction to MAX6675 K-Type: https://youtu.be/VGqONmUinqA
Using MAX6675 K-Type thermocouple whit LED display: https://youtu.be/cD5oOu4N_AE
Using MAX6675 K-Type thermocouplewith LCD1602-I2C: https://youtu.be/BlhpktgPdKs
Using 2 or more MAX6675 K-Type thermocouple: https://youtu.be/c90NszbNG8c
Using MAX6675 K-Type thermocouple as Heater or Coller controller: [this video]
* * 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 download 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"
//Robojax.com heater/cooler with MAX6675 Thermocoupler
int GNDpin = 2;
int VCCpin =3;
int thermoCLK = 4;
int thermoCS = 5;
int thermoDO = 6;
MAX6675 thermocouple(thermoCLK, thermoCS, thermoDO);
const int relayPin =8;
const int relayON = LOW;// do not change
const int relayOFF = HIGH; //do not chage
int relayState = relayOFF;//initial state of relay
const int TEMPERATURE_UNIT =1;//1=Celsius, 2=Fahrenheit, 3=Keliven
const float START_TEMPERATURE = 80.0;//unit above
const float STOP_TEMPERATURE = 100.0;//unit above
const int CONTROL_TYPE = 1;// 1= heater, 2=cooler
float temperature;
void setup() {
//Robojax.com heater/cooler with MAX6675 Thermocoupler
Serial.begin(9600);
Serial.println("MAX6675 test with relay");
// use Arduino pins
pinMode(relayPin, OUTPUT);//pin for relay
digitalWrite(relayPin, relayState);
pinMode(VCCpin, OUTPUT);
digitalWrite(VCCpin, HIGH);
pinMode(GNDpin, OUTPUT);
digitalWrite(GNDpin, LOW);
// wait for MAX chip to stabilize
delay(500);
//Robojax.com heater/cooler with MAX6675 Thermocoupler
}
void loop() {
//Robojax.com heater/cooler with MAX6675 Thermocoupler
readTemperature();
printTemperature();
loadControl();
if(temperature >=89.5)
{
///
}
delay(1000);
//Robojax.com heater/cooler with MAX6675 Thermocoupler
}//loop
/*
* loadControl()
* @brief controls the load based
* @param state can be either : relayON or relayOFF
* @return returns none
* Written by Ahmad Shamshiri for robojax.com
* on May 20, 2020 at 15:23 in Ajax, Ontario, Canada
*/
void loadControl()
{
//Robojax.com heater/cooler with MAX6675 Thermocoupler
// Serial.print("Start: ");
// Serial.print(START_TEMPERATURE);
// Serial.print(" Stop: ");
//Serial.println(STOP_TEMPERATURE);
if(CONTROL_TYPE ==1)
{
if(START_TEMPERATURE >= temperature && STOP_TEMPERATURE >=temperature)
{
relayControl(relayON);
}
if(STOP_TEMPERATURE <=temperature)
{
relayControl(relayOFF);
}
}else{
if(START_TEMPERATURE >= temperature && STOP_TEMPERATURE >=temperature)
{
relayControl(relayOFF);
}
if(STOP_TEMPERATURE <=temperature)
{
relayControl(relayON);
}
}
//Robojax.com heater/cooler with MAX6675 Thermocoupler
}//loadControl()
/*
* relayControl(int state))
* @brief turns the relay ON or OFF
* @param state is "relayON" or "relayOFF" defined at the top of code
* @return returns none
* Written by Ahmad Shamshiri for robojax.com
* on May 20, 2020 at 15:23 in Ajax, Ontario, Canada
*/
void relayControl(int state)
{
//Robojax.com heater/cooler with MAX6675 Thermocoupler
if(state ==relayON)
{
digitalWrite(relayPin, relayON);
Serial.println("Relay ON");
}else{
digitalWrite(relayPin, relayOFF);
Serial.println("Relay OFF");
}
//Robojax.com heater/cooler with MAX6675 Thermocoupler
}//relayControl()
/*
* readTemperature()
* @brief reads the temperature based on the TEMPERATURE_UNIT
* @param average temperature
* @return returns one of the values above
* Written by Ahmad Shamshiri for robojax.com
* on May 20, 2020 at 15:23 in Ajax, Ontario, Canada
*/
void readTemperature()
{
//Robojax.com heater/cooler with MAX6675 Thermocoupler
if(TEMPERATURE_UNIT ==2)
{
temperature = thermocouple.readFahrenheit();//convert to Fahrenheit
}else if(TEMPERATURE_UNIT ==3)
{
temperature = thermocouple.readCelsius() + 273.15;//convert to Kelvin
}else{
temperature = thermocouple.readCelsius();// return Celsius
}
//Robojax.com heater/cooler with MAX6675 Thermocoupler
}// readTemperature()
/*
* printTemperature()
* @brief prints temperature on serial monitor
* @param charact type
* @param "type" is character
* C = Celsius
* K = Keliven
* F = Fahrenheit
* @return none
* Written by Ahmad Shamshiri for robojax.com
* on May 08, 2020 at 02:45 in Ajax, Ontario, Canada
*/
void printTemperature()
{
//Robojax.com heater/cooler with MAX6675 Thermocoupler
Serial.print(temperature);
printDegree();
if(TEMPERATURE_UNIT ==2)
{
Serial.print("F");
}else if(TEMPERATURE_UNIT ==3)
{
Serial.print("K");
}else{
Serial.print("C");
}
Serial.println();
//Robojax.com heater/cooler with MAX6675 Thermocoupler
}//printTemperature()
/*
* @brief prints degree symbol on serial monitor
* @param none
* @return returns nothing
* Written by Ahmad Shamshiri on July 13, 2019
* for Robojax Tutorial Robojax.com
*/
void printDegree()
{
Serial.print("\xC2");
Serial.print("\xB0");
}
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