Efficient gas monitoring

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Efficient gas monitoring

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 leverages the MQ2 gas sensor and ACS712 current sensor with the EzloPi device for a reliable, real-time gas leakage and usage monitoring system. The MQ2 sensor detects gas concentrations, including propane, methane, and smoke, while the ACS712 sensor monitors the appliance’s power consumption. Together, they enhance safety by triggering an LED alert when gas levels exceed a safe threshold due to irregular power usage suggesting a malfunction. This system provides a simple yet effective solution for preventive safety in household appliances, ensuring user safety and resource efficiency.

3. Circuit Diagram & Interface

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

ESP32 as an EzloPi smart device.
MQ2 gas sensor with two 1K Ohm resistors.
ACS712 Current sensor.
LED with 100 Ohm Resistor.

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 MQ2 Gas sensor:

ESP32	MQ2	Resistor 1	Resistor 2
VIN	VCC	-	-
GND	GND	-	-
D13	D0	-	-
-	A0	Terminal 1	-
D33	-	Terminal 2	Terminal 1
GND	-	-	Terminal 2

From ESP32 to the FC-51 Proximity sensor:

ESP32	ACS712
VIN	VCC
GND	GND
D33	OUT

From ESP32 to the LED & Resistor:

ESP32	LED	Resistor
D15	-	Terminal 1
GND	Cathode	-
-	Anode	Terminal 2

4. Interfacing the Current Sensor & Gas sensor using 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 Other.

An Other window will be opened for inputting the following parameters:

Set a Device name of your choosing. In our case, we set it to MQ2.
Set Device subtype to MQ2 LPG Gas Sensor.
Tick mark the boxes of GPIO 1 & GPIO2.
Set the GPIO 1 to 13.
Set the GPIO 2 to 32.
Then Click Apply Button.

In the Device Configuration, tab click on Analog Input.

An Analog Input window will be opened for inputting the following parameters:

Set a Device Name of your choosing. In our case, we set it to Current Sensor.
Set Device Subtype to CS712TELC 05B Current Sensor
Set the ADC input pin to 33.
Set the Resolution to 10-bit.
Then Click Apply Button.

In the Device Configuration, tab click on Digital Output

A Digital Output window will be opened for inputting the following parameters:

Set a Device name of your choosing. In our case, we set it to the LED.
Set Device Subtype to LED.
Set the OUT GPIO to 15.
Set the Resistor to PULL UP.
Then Click 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 credential to log in that you used for configuring the controller with the web flasher.

Here, on the MiOS web dashboard, you will be able to see the tiles of connected devices. In our case, we have an ACS712 current sensor, MQ2 gas sensor and LED tile. The LED tile will indicate the status of the gas sensor and current sensor whether or not the sensor's values are within the set threshold.

MeshBots:

On the left 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 this 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 Test011.

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 MQ2_digi..
Set the Capability to parent_abstract.
Set the variables to uuid.
Set the Comparator to Greater(>).
Set the Value Type to value.
Set the value to 400.
Add another trigger by pressing the Add Trigger button.
Set Node Type to Device.
Set the Node to Current Sensor.
Set the Capability to parent_abstract.
Set the variables to uuid.
Set the Comparator to Greater(>).
Set the Value Type to value.
Set the value to 4.00.

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

Set Controllable Type to Device.
Set the Controllable to LED.
Set the Capability to power_command.
Set the Value Type to set.
Set the Value to true.
Now Click the Save button.

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, in the MiOS web dashboard, we can see that when the current passing through current sensor is normal value and within in our range whereas gas sensor value is also in the normal range, therefore our LED is OFF according to the condition set in the meshbot.

Here in the above picture, it now shows that when the gas concentration becomes very high and also current value gets out of the set limit, the LED turns ON because of our meshbot settings.

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:

On the MiOS mobile app, you will be able to see the tiles of connected devices. In our case, we have an ACS712 current sensor, MQ2 gas sensor and LED tile. The LED tile will indicate the status of the gas sensor and current sensor whether or not the sensor's values are within the set threshold.

Here in the above picture, it now shows that when the gas concentration becomes very high and also current value gets out of the set limit, the LED turns ON because of our meshbot settings.