
Smart monitoring with EzloPi
Battery-powered smart load Indicator with LED
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 battery-powered smart load indicator is a compact and efficient solution for real-time weight monitoring using a load cell with an HX711 weight sensor module. Powered by a 3.7V LiPo battery, the system incorporates a step-up boost converter to ensure stable voltage supply for the components. Two LEDs, connected via 120-ohm resistors, visually indicate weight thresholds, providing an intuitive alert system. Designed to interface seamlessly with the EzloPi device, this setup is ideal for portable weight monitoring applications, combining low power consumption with reliable performance.
3. Circuit Diagram & Interface
The following components are required for interfacing with the EzloPi device:
- ESP32 as an EzloPi smart device.
- MT3608 Step-up DC-DC boost converter
- Load cell with HX711 weight sensor module.
- Two LEDs with 120 Ohms Resistor.
- 3.7V Lipo battery
The wiring diagram of ESP32 30 pin is represented as follows:


The following connections are made in order to complete the circuit setup.
From Battery to Boost Converter:
Battery | MT3608 |
BAT+ | VIN+ |
BAT- | VIN- |
From Boost Converter to ESP32:
MT3608 | ESP32 |
VOUT+ | VIN |
VOUT- | GND |
From ESP32 to the HX711 module:
MT3608 | HX711 |
VIN | VCC |
GND | GND |
D12 | CK |
D13 | DO |
From HX711to the Load cell:
HX711 | Load Cell |
E+ | Red |
E- | Black |
A+ | Green |
A- | White |
From ESP32 to the LED & Resistor:
ESP32 | LED1 | Resistor1 | LED2 | Resistor2 |
D15 | - | Terminal 1 | - | - |
D4 | - | - | - | Terminal 1 |
GND | Cathode1 | - | Cathode2 | - |
- | Anode1 | Terminal 2 | - | - |
- | - | - | Anode2 | Terminal 2 |
4. Interfacing the load cell, weight sensor module & LEDs using the EzloPi Web Flasher:
1. Set up your device/hardware by visiting config.ezlopi.com

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

- 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.

- Other window will be opened for inputting the following parameters:
- Set a Device name of your choosing. In our case, we set it to HX711.
- Set Device Subtype to HX711 LOADCELL.
- Tick mark the GPIO1 and GPIO2 boxes.
- Set the GPIO1 pin to 12.
- Set the GPIO1 pin to 13.
- 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 1.
- Set Device Subtype to LED.
- Set the OUT GPIO to 15.
- Set the Resistor to PULL UP.
- 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 2.
- Set Device Subtype to LED.
- Set the OUT GPIO to 4.
- 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.
- Now 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.

- On the MiOS web dashboard, you will be able to see the tiles of connected devices. In our case we have a load sensor or weight sensor with two LED tiles for different load indications.
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 Cloud.

- On the next screen you will see that we can create a name of our choosing, in this case we write it as Test016.

- 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 HX711.
- Set the Capability to parent_abstract.
- Set the Variables to uuid.
- Set the Comparator to Less (<).
- Set the Value Type to value.
- Set the Value to 0.25.
- Set these values in the ACTION section.
- Set Controllable Type to Device.
- Set the Controllable to LED 1.
- 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.

- Again Click on Create new Meshbot and under Automation MeshBot click on Cloud.
- On the next screen you will see that we can create a name of our choosing, in this case we write it as Test017.

- 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 HX711.
- 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 0.25.
- Set these values in the ACTION section.
- Set Controllable Type to Device.
- Set the Controllable to LED 2.
- 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.

- In the MiOS web dashboard, it can be seen that the load sensor is showing some load value because we have placed an empty glass on the base of load cell that is why LED1 is triggered ON while LED2 remained OFF due to condition we have set in the meshbot.

- Here in the above picture, it shows that when we have placed a full glass of water on the base of the load cell then it shows a different load reading on it, so now LED2 is triggered ON while LED1 now turned OFF because of our meshbot setting.
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, it can be seen that the load sensor is showing some load value because we have placed an empty glass on the base of load cell that is why LED1 is triggered ON while LED2 remained OFF due to condition we have set in the meshbot.

- Here in the above picture, it shows that when we have placed a full glass of water on the base of the load cell then it shows a different load reading on it, so now LED2 is triggered ON while LED1 now turned OFF because of our meshbot setting.

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