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Learn how to send data between an ESP32 / ESP8266 development board and the Arduino Cloud IoT.

LAST REVISION: 07/24/2023, 12:27 PM


In this tutorial, we will go through the steps necessary to set up an ESP32 / ESP8266 development board with the Arduino Cloud IoT. To test it out, we will send random values from the board to the cloud, and set up a switch that can enable the built-in LED on the board.

Over-the-air (OTA) uploads is now supported on ESP32 boards. You can read more about this feature in the OTA uploads article.


The goals of this project are:

  • Send data to the cloud from the board.
  • Turn ON/OFF an LED on the board through the cloud.

Hardware & Software needed

We will also need the following components for the circuit:

  • LED
  • 220 ohm resistor
  • Breadboard
  • Jumper Wires


Follow the circuit below to connect the LED to the ESP32 / ESP8266 board.

Note: if you prefer to use your board’s built-in LED, you do not need a circuit.

The circuit for this tutorial.

Setting up the Arduino Cloud IoT

To start, we will need to head over to the Arduino Cloud IoT. This is also accessible through the menu at the top right.

Navigate to the cloud.

Step 1: Setting up the device

1. Once in the cloud, click on the “Devices” tab. Then, click on the “Add device” button.

Adding a device.

2. Then, click on “Set up a 3rd party device”.

Setting up a third party device.

3. Now we need to select what board we are using. Select either ESP32 or ESP8266, and then choose the board from the drop-down menu.

Select the board.

4. Now the board needs a name. We choose My_ESP32, but you can have a lot more imagination than that!

Naming the board.

5. You will now receive your Device ID and Secret key. Please note that the secret key cannot be recovered, so make sure you note it down. You can also download a PDF with the information.

When you have saved it, tick the box at the bottom, and click on “Continue”.

Credentials of your board.

Congratulations! You have now configured your ESP32 board with the Arduino Cloud IoT. Your device will now appear in the list of devices.

Step 2: Creating a Thing

The next step is to create a Thing. This is done by navigating to the “Things” tab.

Go to the Thing tab.

Then, we need to create a new Thing, by clicking on the “Create Thing” button. We can then rename our Thing something appropriate to what we are doing, in this case we simply chose ESP32 Project.

Creating a Thing.

Now, we need to link our device with our Thing. This is done by clicking on the button in the “Device” section. This will open a window, where your ESP32 / ESP8266 should be available to select.

Select ESP32 / ESP8266 device.

Once the device is linked, we need to create two variables:




. Click on “Add variable” button. This will open a window where you need to fill in variable information. Let’s create the


first. The data type is int, permission is read only and update policy is on change.

Once done, click on the “Add variable” button.

Adding the random_value variable.

Now, let’s also add the


variable. The data type for this variable is boolean, the permission is read & write, and update policy is on change.

Once done, click on the “Add variable” button.

Adding the led_switch variable.

Step 3: Adding credentials

Now, we need to enter the credentials for our network, plus the secret key generated during the device configuration.

First, click on the button in the “Network Section”.

Open the credentials tab.

Then, enter the credentials (network name, network password and secret key). Click “Save” when finished.

Entering the credentials.

Programming the board

The next step is to program the board. To do so, we need to go to the “Sketch” tab.

Navigate to the sketch tab.

The code for this tutorial can be found in the snippet below. Upload it to the board by clicking on the “Upload” button at the top left corner.

Complete sketch

Note: in this tutorial we are using pin 13 for the LED. You can easily change this to another GPIO, by editing the LED variable.

1#include "thingProperties.h"

16 ArduinoCloud.begin(ArduinoIoTPreferredConnection);

25 setDebugMessageLevel(2);

26 ArduinoCloud.printDebugInfo();

32 random_value = random(0, 500);

37void onLedSwitchChange() {

40 digitalWrite(LED, HIGH);

If the upload was successful, we should see it printed in the console at the bottom of the editor.

Successful upload of sketch.

Creating a dashboard

Now that the sketch is running on the ESP32 / ESP8266 board, we can move on to the final step, which is creating a dashboard.

First, navigate to the “Dashboards” tab.

Navigating to the dashboards tab.

Then, click on the “Build dashboard” button.

Click on the “Build dashboard” button.

To edit the dashboard, click on the pencil icon at the top left icon, select “Things” and search for your Thing. Select it, and click on “Add widgets” as shown in the image below.

Adding widgets.

We should now have two widgets that are linked to your ESP32 / ESP8266 board.

  • random_value

    – whenever the


    updates on the board, it also updates here.

  • led_switch

    – when we activate this switch, we turn ON the LED connected to the board (pin 13).

Complete dashboard.


If you are having issues completing this tutorial, make sure that the following is correct:

  • We have entered the right secret key in the credentials window.
  • We have entered the right network name and password in the credentials window.
  • We have selected the right device (if you have multiple devices registered in the cloud, you may have selected the wrong device).

Note: The Arduino Cloud IoT’s support for the ESP32 is in an experimental stage.


In this tutorial, we went through the basics of setting up an ESP32 / ESP8266 microcontroller to communicate with the Arduino Cloud IoT. We tested this out by sending a random value from the board to the cloud, and by creating a switch that controls an LED from the cloud.

More tutorials

You can find more tutorials in the Arduino IoT Cloud documentation page.