Rain Detection Alerts using Rain sensor and EzloPi meshbot

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 objective of this project is to interface an FC-37 rain sensor FC-37 to integrate rain sensing capabilities to the EzloPi device, allowing users real-time monitoring of precipitation levels.

FC-37 is a simple rain detection sensor that can measure the presence of rain. By interfacing the FC-37 rain sensor with the EzloPi, users will be able to receive rainfall alerts, enabling various applications such as automated alerts, weather monitoring for smart homes, and smart irrigation systems, and ultimately enhance the user experience. With the EzloPi automation meshbots, users can assign tasks or actions to certain rules and conditions to automate various functions such as alerting the user when it starts raining, etc.

2. Project Video Demonstration

Welcome to the project demonstration video section. The following video showcases the key aspects of Automate your Rain sensor email alerts with meshbots on EzloPi Platform, providing a visual walkthrough of its implementation.

3. Circuit Setup & Interfacing

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

  • ESP32 as an EzloPi smart device.
  • LM393 comparator IC module.
  • FC-37 rain sensor module.

The wiring diagram of ESP32 is represented as follows:

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

From ESP32 to the LM393 comparator module:

From the LM393 module to the Rain sensor:

4. Interfacing the Rain Sensor with the EzloPi Web Flasher:

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

  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 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 the Rain Sensor.
  • Set device Subtype to Water Leak Sensor.
  • Set the 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 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 Web Application

  1. After configuring the controller with the EzloPi web flasher, head to ezlogic.mios.com
  1. Use the same credential to log in that you used for configuring the controller with the web flasher.
  1. Here, as you can see in the MiOS web dashboard, we can see the motion sensor tile. The above figure is indicating that motion is not being detected by the sensor.


  1. On the right side of the screen under Automation, click on MeshBots.
  1. On meshbot screen, click on Create new MeshBot button present on the top right corner of the screen.
  1. After clicking on Create new MeshBot you will see this now under Automation MeshBot click on Cloud.
  1. On the next screen you will see that we can create a name of our choosing, in this case we write it as Test01 Sensor.
  1. In the trigger tab you can set the TRIGGER for your device and in the ACTION tab you can set the action to be performed based on the trigger which you have created.
  1. Set these things in TRIGGER section:
  • Set Node Type to Device.
  • Set the Node to Rain sensor.
  • Set the Capability to Water leak alarm.
  • Set the Value to water_leak_detected.
  1. Set these values in the ACTION section.
  • Set Controllable Type to Notification.
  • Set the User to Your user account but in our case the user account is Tayyab.
  • Set the Channels to email,push.
  • Set the Subject to Rain Update.
  • Set the Message body info to Rain is detected.
  • After clicking the apply button you can see a table of your setting in the Current configuration tab.
  1. After clicking the save button you can see this screen on the top right corner of the screen.
  1. Here you can see your saved MeshBot. Now click on Dashboard.
  1. It shows a “Rain Detected” or “Leak detected” message on the tile when the sensor detects any raindrops or rain water. Therefore, an email is sent to the user to notify them about the rain.

6. 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. Currently, no rain drops are detected by the sensor therefore the rain sensor tiles show the “No Rain" or “No Leak” message.
  1. It shows a “Rain Detected” or “Leak detected” message on the tile when the sensor detects any raindrops or rain water. Therefore, an email is sent to the user to notify them about the rain.
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