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Reading Temperature Wirelessly over WiFi with DHT11, DHT22 and ESP8266 NodeMCU

Reading Temperature Wirelessly over WiFi with DHT11, DHT22 and ESP8266 NodeMCU

This this video shows you how to use DHT11 and DHT11 with ESP8266 to read temperature over WiFi on Computer or mobile device in Home Wifi Network.

URL to enter into Preferences of Arduion IDE: https://arduino.esp8266.com/stable/package_esp8266com_index.json Network.

Topics covered in this video

DHT code for ESP8266 and Arduino IDE

 * Display temperature using DHT11, DHT22 with NodeMCU ESP8266 with Arduino IDE
 * Written by Ahmad Shamshiri on Sep 27, 2019
 * in Ajax, Ontario, Canada
 * Watch video instruciton for this video: https://youtu.be/1A4-6hDARQc
 * I have combined DHT library of Adafruit with ESP8266 WebServer both links 
 * Adafruit DHT library on GitHub: https://github.com/adafruit/DHT-sensor-library
 * and 
 * ESP8266 on GitHub : https://github.com/esp8266/Arduino
Get this code and other Arduono codes from Robojax.com
You can get the wiring diagram from my Arduino Course at Udemy.com
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 * 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 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
    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/>. 


const int refresh=3;//3 seconds
// DHT settings starts
#include "DHT.h"
#define DHTPIN 2     // what digital pin we're connected to
// Uncomment whatever type you're using!
//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)
float tValue;// 
// ****** DHT settings end (Robojax.com )

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>

#ifndef STASSID
#define STASSID "Wifi SSID" // Your WiFi SSID
#define STAPSK  "Secrete Wifi password" //Your WiFi password

const char* ssid = STASSID;
const char* password = STAPSK;

ESP8266WebServer server(80);

void sendTemp() {

  String page = "<!DOCTYPE html>

  page +="    <meta http-equiv='refresh' content='";
  page += String(refresh);// how often temperature is read
  page +="'/>
  page +="<html>
  page +="<body>
  page +="<h1>Robojax.com DHT Code</h1>
  page +="<p style=\"font-size:50px;\">Temperature<br/>
  page +="<p style=\"color:red; font-size:50px;\">";
  page += String(tValue, 2);
  page +="</p>
  page +="</body>
  page +="</html>
 server.send(200,  "text/html",page);


void handleNotFound() {
  String message = "File Not Found

  message += "URI: ";
  message += server.uri();
  message += "
Method: ";
  message += (server.method() == HTTP_GET) ? "GET" : "POST";
  message += "
Arguments: ";
  message += server.args();
  message += "
  for (uint8_t i = 0; i < server.args(); i++) {
    message += " " + server.argName(i) + ": " + server.arg(i) + "
  server.send(404, "text/plain", message);


void setup(void) {
  // Robojax.com code for ESP8266 and DHT11 DHT22
  WiFi.begin(ssid, password);

  // Wait for connection
  while (WiFi.status() != WL_CONNECTED) {
  if (WiFi.status() == WL_CONNECTED)
    uint8_t macAddr[6];
    Serial.printf("Connected, mac address: %02x:%02x:%02x:%02x:%02x:%02x
", macAddr[0], macAddr[1], macAddr[2], macAddr[3], macAddr[4], macAddr[5]);
  Serial.print("Connected to ");
  Serial.print("IP address: ");

  if (MDNS.begin("robojaxDHT")) {
    Serial.println("MDNS responder started");

  server.on("/", sendTemp);

  server.on("/inline", []() {
    server.send(200, "text/plain", "this works as well");


  Serial.println("HTTP server started");

void loop(void) {
  // Robojax.com code for ESP8266 and DHT11 DHT22
  float c = dht.readTemperature();// Read temperature as Celsius (the default)
  float h = dht.readHumidity();// Reading humidity 
  float f = dht.readTemperature(true);// Read temperature as Fahrenheit (isFahrenheit = true)
 tValue =c;
  delay(300);// change this to larger value (1000 or more) if you don't need very often reading
  // Robojax.com code for ESP8266 and DHT11 DHT22

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