MAX6675 Thermocouple Temperature over Wi-Fi with ESP8266 NodeMCU D1 Mini
In this tutorial, we learn how to use a MAX6674 K-type thermocouple sensor with an ESP8266 NodeMCU and D1 Mini to measure temperature over WiFi on a desktop, tablet, and mobile phone. The code can use Ajax, which requires your router to be connected to WiFi, and without Ajax, which does not require WiFi.
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Browser screen on Desktop
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Browser screen on MObile Phone
340-MAX6675 Thermocouple Temperature over WiFi with ESP8266 NodeMCU D1 Mini
语言: C++
/*
*
* This is Arduino code to measure a MAX6675 K-Type thermocouple sensor
* over Wifi using an ESP8266 NodeMCU and D1 Mini.
* This code can work with and without Ajax. See the video for details.
*
* Watch the video instruction for this code: https://youtu.be/sS5apP9vqak
*
* 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 July 06, 2020 in Ajax, Ontario, Canada
* www.robojax.com
*
* Get this code and other Arduino codes from Robojax.com.
Learn Arduino step by step in a structured course with all materials, wiring diagrams and libraries
all in one place.
If you found this tutorial helpful, please support me so I can continue creating
content like this.
or make a donation using PayPal http://robojax.com/L/?id=64
Related videos:
Introduction to MAX6675 K-Type: https://youtu.be/VGqONmUinqA
Using MAX6675 K-Type thermocouple with an LED display: https://youtu.be/cD5oOu4N_AE
Using MAX6675 K-Type thermocouple with an LCD1602-I2C: https://youtu.be/BlhpktgPdKs
Using 2 or more MAX6675 K-Type thermocouples: https://youtu.be/c90NszbNG8c
Using MAX6675 K-Type thermocouple as a heater or cooler 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 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/>.
*/
//Watch the video for details of the lines below
static const uint8_t D0 = 16;
static const uint8_t D1 = 5;
static const uint8_t D2 = 4;
static const uint8_t D3 = 0;
static const uint8_t D4 = 2;
static const uint8_t D5 = 14;
static const uint8_t D6 = 12;
static const uint8_t D7 = 13;
static const uint8_t D8 = 15;
static const uint8_t D9 = 3;
static const uint8_t D10 = 1;
///////// Start of MAX6675 settings
#include "max6675.h"
//Robojax.com MAX6675 Thermocouple
int thermoCLK = D4;
int thermoCS = D3;
int thermoDO = D2;
MAX6675 thermocouple(thermoCLK, thermoCS, thermoDO);
float tempC, tempF, tempK;
char type='C';//default temperature type C
char *titleMain="Using ESP8266";
char *titleTemp="Temperature: ";
int refreshTime =5000;
const bool useAjax=false;//set to "true" or "false". if set to "true" then internet connection is needed
/////////////// end of MAX6675 settings
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#ifndef STASSID
#define STASSID "Robojax"//your Wifi SSID (case sensitive)
#define STAPSK "YouTube2020"//your WiFi password
#endif
const char *ssid = STASSID;
const char *password = STAPSK;
ESP8266WebServer server(80);
void handleRoot() {
//Robojax.com MLX90614 with ESP8622 with Ajax
String HTML ="<!DOCTYPE html>\
<html>\
<head>\
\t\n<title>Robojax MAX6675 Thermocouple</title>\
\t\n<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">\
\n<style>\
\nhtml,body{\t\nwidth:100%\;\nheight:100%\;\nmargin:0}\n*{box-sizing:border-box}\n.colorAll{\n\tbackground-color:#90ee90}\n.colorBtn{\n\tbackground-color:#add8e6}\n.angleButtdon,a{\n\tfont-size:30px\;\nborder:1px solid #ccc\;\ndisplay:table-caption\;\npadding:7px 10px\;\ntext-decoration:none\;\ncursor:pointer\;\npadding:5px 6px 7px 10px}a{\n\tdisplay:block}\n.btn{\n\tmargin:5px\;\nborder:none\;\ndisplay:inline-block\;\nvertical-align:middle\;\ntext-align:center\;\nwhite-space:nowrap}\n";
HTML +=".button {\n";
HTML +=" border: none\;\n color: white\;\n padding: 15px 32px\;\n";
HTML +=" text-align: center\;\n";
HTML +=" text-decoration: none\;\n";
HTML +=" display: inline-block\;\n";
HTML +=" font-size: 25px\;\n";
HTML +=" margin: 4px 2px\;\n";
HTML +=" cursor: pointer\;\n";
HTML +="} \n";
HTML +="</style>\n\n";
if(useAjax)
{
HTML +="<script src=\"https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js\"></script>\n\n";
HTML +="<script>\n";
HTML +="$(document).ready(function(){\n";
HTML +="function loadTemp(){\n";
HTML +=" $('#div1').load(";
if(type =='C'){
HTML +="\"\/c\"\n";
}else if(type =='F')
{
HTML +="\"\/f\"\n";
}else{
HTML +="\"\/k\"\n";
}
HTML +=",function () {\n";
HTML +=" $(this).unwrap()\;\n";
HTML +=" })\;\n";
HTML +="}\n";
HTML +="loadTemp()\;\n";
HTML +="setInterval(function(){\n";
HTML +=" loadTemp() \n";
HTML +="}, 5000)\;\n";
HTML +="})\; </script> \n";
}
HTML +="</head>\n\n<body>\n<h1>Robojax MAX6675 Thermocouple</h1>\n";
HTML +="<h1>";
HTML +=titleMain;
HTML +="</h1>\n";
HTML +="<div id=\"div1\" style=\"background-color: #aecbd6 !important\; display: inline-block\; margin: 10px\"><h2>";
if(useAjax)
{
HTML +="<div id=\"div1\"><h2>";
HTML +=titleTemp;
HTML +="</h2></div>\n";
}else{
if(type =='C'){
HTML +="<span style=\"font-size: 28px\">\n";
HTML +=titleTemp;
HTML +=tempC;
HTML +="°C</span><br/>\n";
}
if(type =='F')
{
HTML +="<span style=\"font-size: 28px\">\n";
HTML +=titleTemp;
HTML +=tempF;
HTML +="°F</span><br/>\n";
}
if(type =='K')
{
HTML +="<span style=\"font-size: 28px\">\n";
HTML +=titleTemp;
HTML +=tempK;
HTML +="°K</span><br/>\n";
}
}//if ajax
HTML +="<br/>";
if(!useAjax)
{
HTML +="<a href=\"/c\" class=\"button\" style=\"background-color: #4CAF50\">Get °C</a>\n";
HTML +="<a href=\"/f\" class=\"button\" style=\"background-color: #4389fa\">Get °F</a>\n";
HTML +="<a href=\"/k\" class=\"button\" style=\"background-color: #fa5e43\">Get °K</a>\n";
}
HTML +="</div>\n"; //background color div
HTML +="\t\n</body>\n</html>\n";
server.send(200, "text/html", HTML);
//Robojax.com MAX6675 with ESP8622 with Ajax
}//handleRoot()
void handleNotFound() {
//Robojax.com MAX6675 with ESP8622 with Ajax
String message = "File Not Found\n\n";
message += "URI: ";
message += server.uri();
message += "\nMethod: ";
message += (server.method() == HTTP_GET) ? "GET" : "POST";
message += "\nArguments: ";
message += server.args();
message += "\n";
for (uint8_t i = 0; i < server.args(); i++) {
message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
}
server.send(404, "text/plain", message);
}//handleNotFound()
void setup() {
//Robojax.com MAX6675 Thermocouple
Serial.begin(115200);
Serial.println("MAX6675 with ESP8266");
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
Serial.println("");
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: http://");
Serial.println(WiFi.localIP());
//multicast DNS //Robojax.com Tutorial
if (MDNS.begin("robojaxESP8266")) {
Serial.println("MDNS responder started");
Serial.println("access via http://robojaxESP8266");
}
server.on("/", handleRoot);
if(useAjax)
{
server.on("/c", displayTempCA);
server.on("/f", displayTempFA);
server.on("/k", displayTempKA);
}else{
server.on("/c", displayTempC);
server.on("/f", displayTempF);
server.on("/k", displayTempK);
}
server.on("/inline", []() {
server.send(200, "text/plain", "this works as well");
});
server.onNotFound(handleNotFound);
server.begin();
Serial.println("HTTP server started");
//Robojax.com MLX90614 with ESP8622
// wait for MAX chip to stabilize
delay(500);
//Robojax.com MAX6675 Thermocouple
}// end of setup
void loop() {
//Robojax.com MAX6675 Thermocouple
server.handleClient();
MDNS.update();
readTemperature();
if(tempC >=89.5)
{
///do something here
}
handleRoot();
delay(1000);
//Robojax.com MAX6675 Thermocouple
}//loop
/*
* 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 with MAX6675 Thermocouple
tempF = thermocouple.readFahrenheit();//convert to Fahrenheit
tempK= thermocouple.readCelsius() + 273.15;//convert to Kelvin
tempC = thermocouple.readCelsius();// return Celsius
//Robojax.com MAX6675 Thermocouple
}// readTemperature()
void displayTempC()
{
//Robojax.com MAX6675 with ESP8622
type ='C';
handleRoot();
}//displayTempC()
void displayTempF()
{
//Robojax.com MAX6675 with ESP8622
type ='F';
handleRoot();
}//displayTempF()
void displayTempK()
{
//Robojax.com MAX6675 with ESP8622
type ='K';
handleRoot();
}//displayTempK()
/////////////////// functions for Ajax
void displayTempCA()
{
//Robojax.com MAX6675 with ESP8622
String HTML ="<span style=\"font-size: 28px\">\n";
HTML +=titleTemp;
HTML +=tempC;
HTML +="°C</span><br/>\n";
server.send(200, "text/html", HTML);
}//displayTemp()
void displayTempFA()
{
//Robojax.com MAX6675 with ESP8622
String HTML ="<span style=\"font-size: 28px\">\n";
HTML +=titleTemp;
HTML +=tempF;
HTML +="°F</span><br/>\n";
server.send(200, "text/html", HTML);
}//displayTemp()
void displayTempKA()
{
//Robojax.com MAX6675 with ESP8622 with Ajax
String HTML ="<span style=\"font-size: 28px\">\n";
HTML +=titleTemp;
HTML +=tempK;
HTML +="°K</span><br/>\n";
server.send(200, "text/html", HTML);
}//displayTempKA()文件📁
没有可用的文件。
