Arduino Nano ESP32 and DHT22 Temperature and Humidity Sensor (Replace Arduino with ESP-based board)

The best of both worlds combined – Arduino Nano & ESP32!

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Arduino Nano ESP32 and DHT22 Temperature and Humidity Sensor (Replace Arduino with ESP-based board)

The EzloPi smart devices provide automation through simple, customizable use with our open-source EzloPi platform, making daily life easier and improving human-machine interactions.

Before moving into this example, it is very important to know about the device registration, provisioning and converting the ESP32 device into an EzloPi device along with knowledge of Web Flasher, MiOS Mobile Application for Android/iOS and the MiOS Web Application.

1. About this example

In this project demonstration, we will show you how to convert an existing project into a smart project using the ESP32 development board. The ESP-based EzloPi device provides the capabilities to convert your hardware (projects or devices/sensors) into IoT capable devices.

This following user guide will take you through the steps to make existing Arduino projects into smart projects using ESP MCU based boards. We can get an understanding for this easy process of converting existing or new projects into smart EzloPi projects.

Arduino Nano ESP32 combines the form factor and ease of use of the Arduino Nano with the processing power and wireless capabilities of the ESP32. This combination allows you to create projects that take advantage of the Arduino ecosystem and libraries while also incorporating Wi-Fi and Bluetooth connectivity for various IoT applications. We have demonstrated the Arduino Nano ESP32 as our EzloPi device by interfacing the DHT22 temperature and humidity sensor.

2. Project Video Demonstration

Welcome to the project demonstration video section. The following video showcases the key aspects of Arduino Nano ESP32 and DHT22 Temperature and Humidity Sensor (Replace Arduino with ESP-based board), providing a visual walkthrough of its implementation.

3. Circuit Setup & Interfacing

The following components are required for interfacing with the EzloPi device:

Arduino Nano ESP32 as an EzloPi smart device.
DHT22 Temperature & Humidity Sensor.

The wiring diagram for Arduino Nano ESP32 is represented as follows:

The following connections are made in order to complete the entire circuit setup.

From Arduino Nano ESP32 to DHT22 sensor:

Connect 3V3 from the Arduino Nano ESP32 to the VCC of the sensor.
Connect GND from the Arduino Nano ESP32 to the GND pin of the sensor.
Connect D4 from the Arduino Nano ESP32 to the DATA pin of the sensor.

4. Interfacing the DHT22 sensor using the EzloPi Web Flasher:

Set up your device/hardware by visiting config.ezlopi.com

Now, click on the Connect Device button and a pop-up window will appear.

Now, select COM Port to which your ESP32 device is connected. In our case, the COM3 port is used.

Click Connect

If you are new to this and it’s your first time configuring, select Create new Device ID. Enter Wifi SSID and Wifi Password.
In the Device Configuration, tab click on One Wire.

7. An One Wire window will open for inputting the following parameters:

Set a device name of your choosing. In our case, we set it to DHT22.
Set OUT GPIO to 4.
Set Device subtype to DHT22 Temperature Humidity Sensor.
Now Click the Apply button.
After clicking the apply button you can see a table of your setting in the device configuration tab.
Press the Flash Device button.

8. A window will appear on the bottom right side of the screen displaying “Please press BOOT button while flashing begins.”

9. Hold the BOOT button down until the next window appears on the bottom right side of the screen which says “Installation prepared. Please release the boot button now.”

Release the BOOT button from your ESP32 when this pop-up on the bottom right window appears.

After some time, a popup will appear saying Device Flashed Successfully! This means that your device has been set up successfully.

5. MiOS App

You can download the MIOS Android app from the Google Play Store and Apple App Store.

After downloading the app, proceed to install the application and open it.

Using the MIOS mobile application, create a new Ezlo Cloud account using the sign-up option. If you already have an account, you may proceed to log in.

After successfully logging in, you will be able to see the number of controllers connected such as a lamp, fan, or any other device in the MiOS app. Tap on any controller of your desired ID:

You will be able to see the status of your controller whether it is online or offline. Access the device dashboard, and tap the device. The following view of the dashboard will appear:

As seen in the MiOS mobile app above, two tiles for the DHT22 sensor are being displayed. The first tile shows the humidity being detected by the sensor and the second tile shows the temperature levels being detected by the sensor.
Here, it can be seen that we have successfully converted an Arduino project without any smart capabilities into a smart project by using an ESP-based development board.

6. MiOS Web Application

After configuring the controller with the EzloPi web flasher, head to ezlogic.mios.com

Use the same credentials to log in that you used for configuring the controller with the web flasher.

As seen in the MiOS dashboard, two tiles for the DHT22 sensor are being displayed. The first tile shows the humidity being detected by the sensor and the second tile shows the temperature levels being detected by the sensor.
Here, it can be seen that we have successfully converted an Arduino project without any smart capabilities into a smart project by using an ESP-based development board.

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