IoT Based Temperature and Humidity Monitoring over ThingSpeak using Arduino UNO and ESP8266

IoT based Temperature and Humidity Monitoring System on Thingspeak using Arduino and ESP8266

In this project, we are using the DHT11 sensor for sending Temperature and Humidity data to Thingspeak using Arduino and ESP8266. By this method, we can monitor our DHT11 sensor’s temperature and humidity data over the internet using the ThingSpeak IoT server. And we can view the logged data and graph overtime on the Thingspeak website.

Here Arduino Uno reads the current temperature and humidity data from DHT11 and sends it to the ThingSpeak server for live monitoring from anywhere in the world. We previously used ThingSpeak with Raspberry Pi and ESP32 to upload the data on the cloud. ThingSpeak is an open data platform for monitoring your data online where you can set the data as private or public according to your choice. ThingSpeak takes a minimum of 15 seconds to update your readings. It's a great and very easy-to-use platform for building IoT projects.


Components Required

  • Arduino Uno
  • ESP8266 WiFi Module
  • DHT11 Sensor
  • Breadboard
  • Jumper Wires


Temperature and Humidity Monitoring System Circuit Diagram

ESP8266 Data logger Circuit Diagram

Data Monitoring over ThingSpeak using Arduino UNO and ESP826


Connections are given in below table: 


Pin Name

Arduino Pin











ESP8266 RX



ESP8266 TX









DHT-11 Data






Step 1: ThingSpeak Setup for Temperature and Humidity Monitoring

For creating your channel on Thingspeak, you first need to Sign up on Thingspeak. In case if you already have an account on Thingspeak, just sign in using your id and password.

For creating your account go to



Click on Sing up if you don’t have account and if you already have an account, then click on sign in.

After clicking on signup, fill in your details.

Sign up for ThingSpeak

After this, verify your E-mail id and click on continue.


Step 2: Create a Channel for Your Data

Once you Sign in after your account verification, Create a new channel by clicking “New Channel” button.

ThingSpeak Channel


After clicking on “New Channel”, enter the Name and Description of the data you want to upload on this channel. For example, I am sending my DHT11 sensor data, so I named it DHT11 data.

Enter the name of your data ‘Temperature’ in Field1 and ‘Humidity’ in Field2. If you want to use more Fields, you can check the box next to Field option and enter the name and description of your data.

After this, click on the save channel button to save your details.


Step 3: API Key

To send data to Thingspeak, we need a unique API key, which we will use later in our code to upload our sensor data to Thingspeak Website.

Click on “API Keys” button to get your unique API key for uploading your sensor data.

ThingSpeak API Key

Now copy your “Write API Key”. We will use this API key in our code.


Programming Arduino for Sending data to ThingSpeak

To program Arduino, open Arduino IDE and choose the correct board and port from the ‘tool’ menu.

Complete code is given at the end of this tutorial. Upload it in Arduino UNO. If you successfully upload your program, Serial monitor will look like this:

Programming Arduino for Sending data to ThingSpeak


After this navigate to your Thingspeak page and open your channel at Thingspeak and output will be shown as below:

ThingSpeak Data Monitoring

Hence, we have successfully monitored Temperature and Humidity data over ThingSpeak using Arudino and ESP32.


#include <stdlib.h>

#include <DHT.h>

#define DHTPIN 5         // DHT data pin connected to Arduino pin 5

#define DHTTYPE DHT11     // DHT11 (DHT Sensor Type )

DHT dht(DHTPIN, DHTTYPE); // Initialize the DHT sensor

#define SSID "WiFi Name"     // "WiFi Name"

#define PASS "WiFi Password"       // "Password"

#define IP ""// ip

String msg = "GET /update?key=Your API Key"; //change it with your key...

float temp;

int hum;

String tempC;

int error;

void setup()


  Serial.begin(115200); // use default 115200.







void loop(){



  temp = dht.readTemperature();

  hum = dht.readHumidity();

  char buffer[10];

  tempC = dtostrf(temp, 4, 1, buffer);


  if (error==1){

    goto start;





void updateTemp(){

  String cmd = "AT+CIPSTART=\"TCP\",\"";

  cmd += IP;

  cmd += "\",80";






  cmd = msg ;

  cmd += "&field1=";  

  cmd += tempC;

  cmd += "&field2="; 

  cmd += String(hum);

  cmd += "\r\n";












  boolean connectWiFi(){



  String cmd="AT+CWJAP=\"";








    return true;


    return false;




he seguido las instrucciones del post, pero en el monitor serial no me aparece igual al ejemplo. 


estas lineas son las que obtengo 

You can add more fields as shown below:

cmd = msg ;

cmd += "&field1=";

cmd += tempC;

cmd += "&field2=";

cmd += String(hum);

cmd += "&field3=";

cmd += String(data);



My ESP8266 has the following pins: Gr,Tx, IO2, En, IO0, Rst, Rx, 3V3.
Can you please help me with the proper UNO pin connections for this ESP8266?

Thank you,


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