Atmospheric pressure measurement using BME280 sensor

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

The following project aims to integrate the BME280 atmospheric sensor with the EzloPi device to enhance environmental monitoring capabilities. Here, we will be monitoring the atmospheric pressure using this sensor. The BME280 sensor measures temperature, humidity, and barometric pressure, providing valuable data for various applications such as weather forecasting, indoor climate control, and IoT environmental monitoring.

By interfacing this sensor with the EzloPi device, users can access and monitor real-time atmospheric data through the MiOS user-friendly interface. This project will empower users to make informed decisions based on accurate environmental information, contributing to improved efficiency and comfort in diverse settings. Additionally, it opens avenues for further expansion and customization of IoT applications leveraging atmospheric data.

2. Project Video Demonstration

Welcome to the project demonstration video section. The following video showcases the key aspects of Atmospheric pressure measurement using BME280 sensor, providing a visual walkthrough of its implementation.

Project Video Demonstration

3. Circuit Setup & Interfacing

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

  • ESP32 as an EzloPi smart device.
  • 5V BME280 Barometric Pressure & humidity sensor.

The wiring diagram of ESP32 30 pin is represented as follows:

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

From ESP32 to the BMP280::


4. Interfacing the BMP280 Pressure Sensor using the EzloPi Web Flasher

1. First setup your MiOS account by visiting and set up your device/hardware by visiting

  1. Log in using the credentials which you just set earlier while signing up.
  1. Now, click on the Connect Device button and a pop-up window will appear.
  1. Now, select COM Port to which your ESP32 device is connected. In our case, the COM3 port is used.

Click Connect

  1. If you are new to this and it's your first time configuring, select Create new Device ID. Click on the Configure Wifi button. Enter Wifi SSID and Wifi Password.
  2. In the Device Configuration, tab click on I2C.
  1. A Digital Input window will open for inputting the following parameters:
  • Set a device name of your choosing. In our case, we set it to BME280.
  • Set Device Sub Type to BME280 I2C.
  • Set the Slave Address to 118.
  • Set the SDA pin to 21.
  • Set the SCL pin to 22.
  • Tick the “Enable Pullup” for both the SDA and SCL
  • 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.
  1. A window will appear on the bottom right side of the screen displaying “Please press BOOT button while flashing begins.”
  1. 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.”
  1. Release the BOOT button from your ESP32 when this pop-up on the bottom right window appears.
  1. 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.

Google PlayApple App Store

  1. After downloading the app, proceed to install the application and open it.
  1. 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.
  1. 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:
  1. 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:
  1. After opening the dashboard, you will be able to see the tile of your connected device. As we can see above in the MiOS mobile dashboard, the BMP280 sensor module tile is showing the current pressure and temperature values.

5. MiOS Web Dashboard

  1. After configuring the controller with the EzloPi web flasher, head to
  1. Use the same credentials to log in that you used for configuring the controller with the web flasher.
  1. After opening the MiOS web dashboard, you will be able to see the tile of your connected device. As we can see above, the BMP280 sensor module tile is showing the current pressure and temperature values.
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