Wiring Thermocouple MAX6675 on ESP8266 12E NodeMCU

In this illustration we will going to wire a Thermocouple, i2C OLED Screen and ESP8266 NodeMCU Board, as you can see the source code it is using a C Sketch code not a LUA script, if you don’t have ESP8266 integration on your Arduino IDE Please follow this link.

The MAX6675 performs cold-junction compensation and digitize the signal from a type-K thermocouple. The data is output in a 12-bit resolution, SPI compatible read only format. This conversion resolves temperatures to 0.25 Degree, allows reading as high as + 1024 degree Celsius and exhibits thermocouple accuracy of 8LSBs for temperature ranging from 0 degree to + 700 degree Celsius. This device mostly used in Industrial, Appliances, Heating, Ventilating, and air conditioning.

Configuring the correct ESP8266 Board in Arduino IDE

Component Required

ESP8266 12E, 13 NodeMCU Board
I2C 0.96” OLED Screen
K TYPE MAX6675 Thermocouple
Jumper Wires / DuPont Wires
Solder Less / Bread Board

Wiring Guide

Code

#include <max6675.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <ESP_Adafruit_SSD1306.h>

#define OLED_RESET 4

int ktcSO = 12;
int ktcCS = 13;
int ktcCLK = 14;

MAX6675 ktc(ktcCLK, ktcCS, ktcSO);
Adafruit_SSD1306 display(OLED_RESET);
  
void setup() {
  Serial.begin(9600);
  //delay(500);
  display.begin(SSD1306_SWITCHCAPVCC, 0x78>>1);
  display.display();
  delay(2000);
  display.clearDisplay();
}

void loop() {
  // basic readout test
//  
//  display.setTextSize(2);
//  display.setTextColor(WHITE);
//  display.setCursor(52,10);
//  display.print((char)223); 
//  display.print("C = "); 
//  display.print(ktc.readCelsius());
//  display.print((char)223); 
//  display.print("\t F = ");
//  display.setCursor(52,30);
//  display.println(ktc.readFahrenheit());

  float DC = ktc.readCelsius();
  // Read temperature as Celsius
  float DF = ktc.readFahrenheit();
  
   Serial.print("C = "); 
   Serial.print(ktc.readCelsius());
   Serial.print("\t F = ");
   Serial.println(ktc.readFahrenheit());
// 

 delay(1000);
 displayData();
}

void displayData(){
  display.setTextSize(1);
  display.setCursor(5,1);
  display.println("14CORE|THERMOCOUPLE");
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(18,20);
  display.print((char)248); 
  display.print("C:"); 
  display.print(ktc.readCelsius());
  
    
  display.setCursor(18,40);
  display.print((char)248); 
  display.print("F:");
  display.println(ktc.readFahrenheit());
  display.display();
  display.clearDisplay();
}

#include <max6675.h>

#include <Wire.h>

#include <Adafruit_GFX.h>

#include <ESP_Adafruit_SSD1306.h>

#define OLED_RESET 4

int ktcSO = 12;

int ktcCS = 13;

int ktcCLK = 14;

MAX6675 ktc(ktcCLK, ktcCS, ktcSO);

Adafruit_SSD1306 display(OLED_RESET);

void setup() {

Serial.begin(9600);

//delay(500);

display.begin(SSD1306_SWITCHCAPVCC, 0x78>>1);

display.display();

delay(2000);

display.clearDisplay();

}

void loop() {

// basic readout test

// display.setTextSize(2);

// display.setTextColor(WHITE);

// display.setCursor(52,10);

// display.print((char)223);

// display.print("C = ");

// display.print(ktc.readCelsius());

// display.print((char)223);

// display.print("\t F = ");

// display.setCursor(52,30);

// display.println(ktc.readFahrenheit());

float DC = ktc.readCelsius();

// Read temperature as Celsius

float DF = ktc.readFahrenheit();

Serial.print("C = ");

Serial.print(ktc.readCelsius());

Serial.print("\t F = ");

Serial.println(ktc.readFahrenheit());

delay(1000);

displayData();

}

void displayData(){

display.setTextSize(1);

display.setCursor(5,1);

display.println("14CORE|THERMOCOUPLE");

display.setTextSize(2);

display.setTextColor(WHITE);

display.setCursor(18,20);

display.print((char)248);

display.print("C:");

display.print(ktc.readCelsius());

display.setCursor(18,40);

display.print((char)248);

display.print("F:");

display.println(ktc.readFahrenheit());

display.display();

display.clearDisplay();

}

Wiring Thermocouple MAX6675 on ESP8266 12E NodeMCU

Tagged on: 14CORE ESP8266 NodeMCU

14 thoughts on “Wiring Thermocouple MAX6675 on ESP8266 12E NodeMCU”

Bjorn Thornqvist
at
Permalink

Nice!
How can I use the WiFi to get this info to a webbrowser?
Reply
- 14core EditorPost author
  at
  Permalink
  
  ESP8266, ENC28J60, WIZNET, RPI, LINKIT, BAGELBONE, ANDROID, Arduino ETHERNET, etc..
  Reply
  - Bjorn Thornqvist
    at
    Permalink
    
    ?
    I thought the best option would be to use integrated TCP/IP.
    Reply
  - Bjorn Thornqvist
    at
    Permalink
    
    Cant I use the self contained SOC with integrated TCP/IP protocol stack?
    Reply
- Dave
  at
  Permalink
  
  I REALLY want to know how to send this data with this exact setup via WiFi to a web browser!! I am going to set this up as soon as the parts arrive on my wood stove!
  Reply
asd
at
Permalink

hey

this script wont work for me. cant compile it
Reply
- 14core EditorPost author
  at
  Permalink
  
  Check the code libraries required.
  #include http://www.14core.com/wp-content/uploads/2016/01/Adafruit_ESP8266.zip
  #include http://www.14core.com/wp-content/uploads/2016/01/Adafruit_SSD1306.zip
  Reply
Stefan Sinner
at
Permalink

Hello, I’m having a big problem compiling with “delay” & “pgmspace.h” can you provide all the required compatible libs?
Reply
- 14core EditorPost author
  at
  Permalink
  
  Integrate Properly the ESP8266 Arduino core to your IDE
  Make it sure your using Arduino IDE Version 1.6
  
  ESP8266 Arduino Core > https://github.com/esp8266/Arduino
  SSD1306 > https://14core.com/wp-content/uploads/2017/11/ESP_Adafruit_SSD1306.zip
  Reply
Ceil122
at
Permalink

this was very interestic idea, first time i try this, got alot problem, and repeat couple time, and got succed,
can u help me how if i want to cobine this with blynk? soo i can monitor via blynk app. thanks
Reply
daniel
at
Permalink

can use 2 max6675 on one nodemcu?
Reply
- 14core EditorPost author
  at
  Permalink
  
  Yes, daniel.. its uses ESP8266 see the pinout diagram of your nodeMCU should be connected to Analog Pin.
  Reply
Jon
at
Permalink

Will this configuration work with a type T thermocouple?
Reply
Jon
at
Permalink

Will this configuration work with a type T thermocouple? UK
Reply

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