Light Monitoring with alerts using LDR analog 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 following project involves interfacing an LDR sensor module with the EzloPi device for real-time light monitoring and alerts the user by utilizing a buzzer. The sensor captures ambient light and provides analog values, allowing real-time tracking of light intensity. This integration enables applications such as automated lighting control, energy efficiency optimization, or security systems based on environmental light conditions. The EzloPi device offers a unique solution for smart home, office or industrial automation setups.

Welcome to the project demonstration video section. The following video showcases the key aspects of Light Monitoring with alerts using LDR analog sensor, providing a visual walkthrough of its implementation.

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

• ESP32 as an EzloPi smart device.
• LM393 Photoresistor module.
• MH-FMD Buzzer

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 LDR module:

From ESP32 to Buzzer:

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 Analog Input.

7. 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 LDR.
• Set Device subtype to LDR Sensor (Analog).
• Set OUT GPIO to 33.
• Set Resolution to 10-bit.
• Then Click Apply Button.

8. In the Device Configuration, tab click on Digital Output.

9. 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 Alarm.
• Set Device subtype to LED.
• Set OUT GPIO to 4.
• Set Resistor to PULL UP.
• Set Default value to LOW.
• 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.

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

11. 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.”

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

13. 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. After opening the MiOS web dashboard, you will be able to see the tile of your connected devices. For now, the LDR tile is showing light intensity value and the buzzer tile is also visible which shows its current state as OFF.

MeshBots

4. On the left 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 new options, click on EzloPi.

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

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 values in TRIGGER section:

• Set Node Type to Device.
• Set the Node to LDR.
• Set the Capability to Light alarm.
• Set the value to no_light.

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

• Set Node Type to Device.
• Set Controllable Type to Buzzer Alarm.
• Set the Capability to Switch.
• Set the value to true.

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

• Set Node Type to Device.
• Set Controllable Type to Buzzer Alarm.
• Set the Capability to Switch.
• Set the value to false.
• After clicking the apply button you can see a table of your setting in the Current configuration tab.

12. Now, it can be seen that when the intensity of light incident on the LDR sensor is very low, the buzzer alarm turns on because of the rules we have set in the meshbot.

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 MiOS mobile dashboard, you will be able to see the tile of your connected devices. For now, the LDR tile is showing light intensity value and the buzzer tile is also visible which shows its current state as OFF.

6. Now, it can be seen that when the intensity of light incident on the LDR sensor is very low, the buzzer alarm turns on because of the rules we have set in the meshbot.