Soil Moisture 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

This example aims to demonstrate how we can interface the Soil Moisture Sensor with the EzloPi device to transform the sensor into a smart device.

By interfacing the sensor to the EzloPi device, we can remotely monitor the moisture levels of the soil through the MiOS user-friendly interface. This integration can allow for automated watering systems, providing an efficient and convenient way to maintain optimal soil conditions for plants.

2. Circuit Setup & Interfacing

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

  • ESP32 as EzloPi smart device.
  • FC-28 Soil Moisture Sensor Module.

The wiring diagram is represented as follows:

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

From ESP32 to the Soil Moisture Sensor Module:

  • Connect the 3v3 pin from ESP32 to the VCC terminal on the moisture sensor module.
  • Connect GND to the GND Pin.
  • Connect D33 from the ESP to the signal (A0) pin.

From the Sensor Module to the FC-28:

  • Connect the (+) from Soil Moisture Sensor Module to one side of FC-28
  • Connect the (-) from Soil Moisture Sensor Module to the other side of FC-28

3. Interfacing the Touch Sensor using 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 Connect Device 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 Analog Input.
  1. An Analog Input window will open for inputting the following parameters:
  • Set a device name of your choosing. In our case we set it to Soil Moisture Sensor.
  • Set device Sub Type to Soil Moisture Sensor
  • Set ADC input pin to 33.
  • Set the Resolution to 10-bit
  • 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 left side of the screen displaying “Please press BOOT button while flashing begins.”
  2. Hold the BOOT button down until the next window appears on the bottom left 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.

4. 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.
MiOS Installed App
  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.
MiOS Login
  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.
  2. Here, as you can see in the MiOS mobile app dashboard, the soil moisture sensor tile, which shows the moisture level as 63% of the soil sample on which the sensor was used.

5. MiOS Web Application

  1. After configuring the controller with the EzloPi web flasher, head to
Login MiOS
  1. Use the same credentials to log in that you used for configuring the controller with the web flasher.
  1. In the web dashboard, you can see the tile labeled as soil moisture sensor. At this instance, the sensor is showing a moisture level of 41% of the soil.
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