Motion sensing using PIR sensor and Buzzer with meshbot implementation

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.

In the ever-growing vast field of IoT and home automation, the integration of sensors and actuators plays a crucial role in enhancing the overall security and convenience of smart homes and industries. This project focuses on interfacing the HC-SR501 Passive Infrared (PIR) sensor and a buzzer with the EzloPi device to create an intelligent alarm system for detecting motion and triggering the alarm. The project leverages meshbot automation rules to further extend the capabilities of the smart home ecosystem.

The following components are required:

• ESP32 as an EzloPi smart device.
• Generic KG001 HC-SR501 PIR sensor.
• Buzzer.

The wiring diagram for ESP32 30 pins is represented as below:

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

From ESP32 (30 pins) to PIR sensor module:

• Connect 3V3 from the ESP32 to the VCC of the PIR module.
• Connect GND from the ESP32 to the GND pin of the PIR module.
• Connect D5 from the ESP32 to the D0 pin of the PIR module.

From ESP32 (30 pins) to the Buzzer:

• Connect the D2 pin from the ESP32 to the Signal pin of the buzzer.
• Connect the GND from the ESP32 to the negative pin of the buzzer.

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 Digital Input.

7. 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 PIR.
• Set the Input GPIO to 5.
• Set Device Subtype to PIR Sensor.
• Now Click the Apply button.

8. Again 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.
• Set Device subtype to LED.
• Set OUT GPIO to 2.
• 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.

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

3. Now, on the MiOS web dashboard, you will be able to see the tile for the PIR sensor and the buzzer alarm. The tile will indicate the status of the buzzer depending on the motion being detected by the sensor.

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 Test004.

8. 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.

9. Set these things in TRIGGER section:

• Set Node Type to Device.
• Set the Node to PIR.
• Set the Category to motion_sensor.
• Set the variables to status.
• Set the Comparator to Equal (==).
• Set the Value Type to true.
• Set the value to true.

10. Set these values in the ACTION section.

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

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. Here in the MiOS web dashboard, you can see that when the PIR gets triggered or detects motion, the buzzer turns on because of the rules we have set in 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. Here, as seen on the MiOS mobile dashboard, when the PIR sensor gets triggered or detects motion, it turns the buzzer on because of the rules we have set in meshbot.