Implementing tank full alert with P45 float switch and buzzer

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Implementing tank full alert with P45 float switch and buzzer

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 P45 float switch and a buzzer with the EzloPi device for efficient water tank level monitoring. The float switch is a simple yet effective liquid level sensor, which is integrated with the EzloPi device to enable real-time monitoring of water levels in various applications for users. This smart monitoring is done by utilizing the MiOS smart platform for allowing the users to monitor and notify them about various water level conditions. We have implemented the float switch in such a way that when the water tank is close to getting full or gets full, the buzzer will be triggered to alert the user to turn off the water pump.

2. Project Video Demonstration

Welcome to the project demonstration video section. The following video showcases the key aspects of Implementing tank full alert with P45 float switch and buzzer, 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.
P45 float switch.
MH-FMD Buzzer.

The wiring diagram is represented as follows:

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

From ESP32 to the Float Switch:

ESP32	Float switch
GND	1st terminal
D5	2nd terminal

From ESP32 to the MH-FMD Buzzer:

ESP32	Buzzer
VIN	VCC
GND	GND
D4	I/O

4. Interfacing the float switch with the EzloPi Web Flasher

1. 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 Digital Input.

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 Float Switch.
Set the Input GPIO to 5.
Set Device Subtype to Float Switch.
Set Default Value to LOW.
Now Click the Apply button.

In the Device Configuration, tab click on Digital Output.

A Digital Output window will open for inputting the following parameters:

Set a device name of your choosing. In our case, we set it to Buzzer.
Set Device subtype to LED.
Set OUT GPIO to 4.
Set Resistor to PULL UP.
Set the default value to LOW.
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.

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

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 Web Dashboard

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.

Now, on the MiOS web dashboard, you will be able to see the tile for the float switch.

MeshBots:

On the right side of the screen under Automation, click on MeshBots.

On meshbot screen, click on Create new MeshBot button present on the top right corner of the screen.
After clicking on Create new MeshBot you will see new options, now under Automation MeshBot click on Local.

On the next screen you will see that we can create a name of our choosing, in this case we write it as Test01.

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.

Set these things in TRIGGER section:

Set Node Type to Device.
Set the Node to Proximity Float Switch.
Set the Capability to Water level alarm.
Set the Value to water_level_ok.

Set these values in the True part of the ACTION section.

Set Controllable Type to Device.
Set the Controllable to Buzzer.
Set the Capability to switch.
Set the Value to true.

Set these values in the False part of the ACTION section.

Set Controllable Type to Device.
Set the Controllable to Buzzer.
Set the Capability to switch.
Set the Value to false.

After clicking the save button you can see this screen on the top right corner of the screen.

Here you can see your saved MeshBot. Now click on Dashboard.

Now, on the MiOS web dashboard, you will be able to see the tile for the float switch and buzzer.

When the water level is below the threshold which is set for the float switch, the tile will display “water level ok” message and when the water level increases and rises above the specific threshold that we have set for the tank, the tile will display “water level above high threshold” message and the buzzer alarm will be triggered as we have set the meshbot conditions.

6. 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:

Now, on the MiOS mobile dashboard, you will be able to see the tile for the float switch and buzzer. They will function according to rules we have set in meshbot.

As you can see in the MiOS mobile dashboard, we can see the float switch tile. When the water level is below the threshold which is set for the float switch, the tile will display “water level ok” message and when the water level increases and rises above the specific threshold that we have set for the tank, the tile will display “water level above high threshold” message and buzzer alarm will be triggered as we have set the meshbot conditions.

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