Getting started with ESP32-S3 and EzloPi

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

This project aims to interface a door sensor magnetic switch with the EzloPi device, which is based on the ESP32-S3 microcontroller board for this project. The primary goal is to develop a reliable door status monitoring system. The project will involve configuring the ESP32-S3 to read the magnetic switch status, which indicates whether a door is open or closed. The EzloPi device is equipped with enhanced processing capabilities and wireless connectivity, and will transmit this status data over Wi-Fi for integration with home automation systems or for alerts. Furthermore, the implementation includes configuring the web flashed to the ESP32-S3 to handle the sensor data efficiently and securely.

Benefits of using ESP32-S3 Over ESP32:

  • Enhanced security features: ESP32-S3 offers advanced security features including AES-XTS hardware encryption, secure boot, and flash encryption, making it more suitable for applications requiring data protection.
  • Improved processing power: The ESP32-S3 is equipped with a dual-core processor and has a higher clock speed compared to the ESP32, which enhances its capability to handle more complex algorithms and faster data processing.
  • Better peripheral support: With additional GPIOs and support for USB OTG, the ESP32-S3 is more versatile for interfacing with various sensors and devices, expanding its usability in diverse IoT applications.

2. Project Video Demonstration

Welcome to the project demonstration video section. The following video showcases the key aspects of Getting started with ESP32-S3 and EzloPi, providing a visual walkthrough of its implementation.

3. Circuit Setup & Interfacing

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

  • ESP32-S3 as an EzloPi smart device.
  • MC-38 Magnetic Door Switch.

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-S3 to the MC-38 Magnetic Door Switch:

  • Connect the 3V3 of the ESP32-S3 with any one wire of the MC-38 Magnetic Door Switch.
  • Connect the D4 pin of the ESP32-S3 to another wire of MC-38 Magnetic Door Switch.

4. Interfacing the MC-38 Magnetic Door Switch module using the EzloPi Web Flasher:

1. 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. Enter Wifi SSID and Wifi Password.
  2. In the Device Configuration, tab click on Digital Input.
  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 Door Sensor
  • Set the INPUT GPIO input pin to 4.
  • Set device Subtype to Reed Switch.
  • Set the Resistor Setting to PULL DOWN.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 MiOS mobile dashboard, you will be able to see the tile of your connected device. As you can see in the example given above, we can see the door sensor tile. It shows a “Closed” message on the tile as the sensor is detecting that the door is closed.
  1. Now as shown above, an “Open” message on the tile when the sensor detects no magnetic fields implying that the door is open.

6. 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. Now, you will see a tile labeled as Door sensor on the MiOS web application dashboard. Currently, As you can see above, It shows a “Closed” message on the tile as the sensor is detecting that the door is closed.


  1. Now as shown above, an “Open” message on the tile when the sensor detects no magnetic fields implying that the door is open.
Buy Components

eZlopie Products A single-channel 5V relay module $00.00

eZlopie Products Momentary switch $00.00

eZlopie Products Level Shifter Module (BSS138) $00.00

eZlopie Products ESP32

eZlopie Products AC Lamp and Holder