Real-time gas monitoring with email alerts using MQ-9 gas 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.

The project aims to enhance air quality monitoring capabilities by interfacing the MQ-9 gas sensor with the EzloPi smart device. This integration enables real-time detection of various gases present in the environment, allowing users to monitor air quality levels efficiently. Moreover, this smart gas detection system is designed to send instant notification alerts via email when the sensor detects any hazardous gases, ensuring timely response to potential safety hazards. This project can be deployed anywhere whether it be your home for smart safety, office or industrial environment.

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

• ESP32 as an EzloPi smart device.
• MQ-9 Combustible gas sensor.

The wiring diagram for the ESP32 30 pin is represented as below:

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

From ESP32 to the MQ-9 gas sensor:

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

2. Log in using the credentials which you just set earlier while signing up.

3. Now, click on the Connect Device button and a pop-up window will appear.

4. Now, select COM Port to which your ESP32 device is connected. In our case, the COM3 port is used.

Click Connect.

5. If you are new to this and it's your first time configuring, select Create new Device ID. Enter Wifi SSID and Wifi Password.
6. In the Device Configuration, tab click on Other.

7. A window will open for inputting the following parameters:

• Set a device name of your choosing. In our case, we set it to MQ9 Gas Sensor.
• Set Device subtype to MQ9 LPG Flammable Gas Sensor.
• Check the box of GPIO 1.
• Set GPIO 1 to 25.
• Check the box of GPIO 2.
• Set GPIO 2 to 33.
• 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.

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

9. 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.”

13. Release the BOOT button from your ESP32 when this pop-up on the bottom right window appears.

14. After some time, a popup will appear saying Device Flashed Successfully! This means that your device has been set up successfully.

1. After configuring the controller with the EzloPi web flasher, head to ezlogic.mios.com

2. Use the same credential to log in that you used for configuring the controller with the web flasher.

3. Here, on the MiOS web dashboard, you will be able to see the tiles for the MQ9 gas sensor which is showing gas concentration levels being detected by the sensor.

MeshBots:

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

5. On meshbot screen, click on Create new MeshBot button present on the top right corner of the screen.

6. After clicking on Create new MeshBot you will see this now under Automation MeshBot click on Cloud.

7. On the next screen you will see that we can create a name of our choosing, in this case we write it as MQ9 Gas Sensor..

8. 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.

9. Set these things in TRIGGER section:

Set Node Type to Device. Set the Node to MQ9 Gas Sensor. Set the Capability to Gas alarm. Set the value to dw_is_closed.

10. Set these values in the ACTION section.

• Set Controllable Type to Notification.
• Set the User to Your user account.
• Set the Channels to email, push.
• Set the Subject to MQ9 Gas Sensor Update.
• Write the suitable Message body that you want to receive in your email. As you can see, we write, Combustible gas detected.
• After clicking the apply button you can see a table of your setting in the Current configuration tab.

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

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

13. As seen in the MiOS web dashboard above, the MQ9 Gas Sensor tile is showing the concentration levels being detected by the sensor therefore an email notification is sent to alert the user when a certain specified concentration levels are detected.

You can download the MIOS Android app from the Google Play Store and Apple App Store.

1. After downloading the app, proceed to install the application and open it.

2. 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.

3. 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:

4. 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:

5. Here, on the MiOS mobile dashboard, you will be able to see the tiles for the MQ9 gas sensor gas concentration levels being detected by the sensor.

6. In the above condition, you can see that when certain concentration levels of gas are detected by the gas sensor, an email is sent to alert the user about the conditions due to the rule set on the meshbot.