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24-Bit I2C Load-Cell Interface with HX711 and STM32F030 for Multi-Point Weighing
The M5Stack U180 Unit Weight-I2C is a compact weighing-acquisition transmitter designed for interfacing external strain-gauge load cells with M5Stack controllers. It combines an HX711 24-bit analogue-to-digital converter with an STM32F030F4P6 32-bit microcontroller, converting low-level load-cell measurements into weight data that can be accessed through a standard I2C interface.
Unlike direct HX711 modules that require dedicated clock and data GPIOs, Unit Weight-I2C provides an I2C interface with a default address of 0x26 and supports address configuration for multi-device operation on the same bus. Software functions support calibration, tare/offset reset, averaging, EMA filtering, and low-pass filtering for practical weighing applications. The measurement range depends on the connected strain-gauge/load-cell sensor, allowing the unit to be adapted to weighing systems with different capacities.
Key Features
- Weighing Controller: STM32F030F4P6 32-bit ARM microcontroller
- ADC: Integrated HX711 weighing ADC
- Resolution: 24-bit analogue-to-digital conversion
- I2C Communication: Provides convenient digital weight data acquisition
- Default I2C Address: 0x26
- Programmable Address: Supports changing the I2C address for multi-unit installations
- Multi-Device Operation: Multiple Weight-I2C units can share the same I2C bus using different addresses
- External Load Cell: Compatible with suitable strain-gauge/load-cell sensors
- Flexible Capacity: Measurement range depends on the connected load cell and calibration
- Calibration Support: Software-configurable weight calibration
- Tare Function: Supports offset reset for zero-weight adjustment
- Digital Filtering: Supports averaging, EMA, and low-pass filtering
- Grove Interface: HY2.0-4P connection for I2C and 5V power
- Load-Cell Terminal: Includes 4-pin 3.96 mm terminal connector
- Development Support: Arduino, UiFlow1, and UiFlow2
Applications
- Miniature weighing scales
- Industrial weighing systems
- Food-processing equipment
- Logistics and package weighing
- Laboratory measurement
- Inventory monitoring
- Smart storage systems
- Load-cell data acquisition
- Automated dispensing systems
- Production-line weighing
- IoT weighing terminals
- Multi-point weight monitoring
Model Size
Package Includes:
- 1 x Unit Weight-I2C
- 1 x HY2.0-4P Grove Cable (20cm)
- 1 x HT3.96-4P
