Magnet Detection and email notification based on ESP32 Internal Hall Effect 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 Hall effect sensor is a transducer that detects changes in magnetic fields. When a magnetic field is present, it generates a voltage proportional to the strength of the field. This voltage can be used to determine the presence, strength, or orientation of a magnet or magnetic field source.

The EzloPi device based on ESP32 comes equipped with a built-in Hall effect sensor, which can prove to be a valuable component for detecting magnetic fields and various applications like proximity sensing, rotation measurement, and more.

Welcome to the project demonstration video section. The following video showcases the key aspects of Magnet Detection and email notification based on ESP32 Internal Hall Effect Sensor on EzloPi, providing a visual walkthrough of its implementation.

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

• ESP32 as an EzloPi smart device.
• A small magnet.

The wiring diagram of ESP32 30 pin is represented as follows:

Note: There is no need for connections because we are using the built-in Hall effect sensor.

1. 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. The Other window will open for inputting the following parameters:

• Set a device name of your choosing. In our case, we set it to the Hall Effect Sensor.
• Set Device Subtype to Internal Hall Effect Sensor.
• Leave the GPIO settings without making any changes. As we are using the built-in Hall effect sensor, we don’t have to set any GPIO.
• 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.

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

16. 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.”

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

18. 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 credentials to log in that you used for configuring the controller with the web flasher.

3. As seen in the MiOS web dashboard above, the Hall effect sensor tile is visible with the message “Closed” which means that the built-in hall effect sensor is detecting magnetic fields or a magnetic object is placed near the ESP32 based EzloPi device.
4. As seen in the MiOS web dashboard above, the Hall effect sensor tile is visible with the message “Open” which means that the built-in hall effect sensor is not detecting magnetic fields.

MeshBots:

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

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

8. On the next screen you will see that we can create a name of our choosing, in this case we write it as Test001.

9. In the trigger tap 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.

10. Set these values in TRIGGER section:

• Set Node Type to Device.
• Set the Node to Hall Effect Sensor.
• Set the Capability to contact_sensor.
• Set the variables to status.
• Set the Comparator to On change.

11. Set these values in ACTION section.

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

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

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

14. As seen in the MiOS web dashboard above, the Hall effect sensor tile is visible with the message “Closed” which means that the built-in hall effect sensor is detecting magnetic fields.

14. As we can see we have received email through Meshbot when a magnet is placed near ESP32 based EzloPi device.

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. After opening the dashboard, you will be able to see the tile of your connected device.
6. When the ESP32 does not detect any magnetic field or object, the tile will display the “Open” message as depicted in the above image.

7. When the ESP32 detects a magnetic field or object, such as a little magnet, we receive an email via meshbot, as shown in the MiOS mobile dashboard.