Description The Mini Scales Unit is a compact 5kg weighing unit for M5Stack projects. It combines a load cell, HX711 ADC acquisition chip, and STM32F030F4P6 protocol conversion MCU so the HX711 weighing module can output weighing results directly through I2C instead of requiring raw ADC handling on the host controller. With I2C communication at address 0x26, the Mini Scales Unit supports multiple modules working in parallel. The onboard SK6812 RGB indicator and function button make zero calibration and tare adjustment easier, while the reserved M3 mounting holes help the I2C weighing sensor fit experimental fixtures, small production jigs, and embedded weighing stations. The HX711 weighing module is suitable for scientific experiments, industrial production, sample weighing, and compact automation projects. When a design needs a small I2C weighing sensor with a direct digital interface, the Mini Scales Unit provides a ready M5Stack-friendly path from load cell to host software. Features Integrated weighing path: the Mini Scales Unit combines a 5kg load cell, HX711 ADC, and STM32 protocol MCU. I2C output: the HX711 weighing module communicates over I2C at address 0x26 and supports multi-unit parallel use. Simple calibration: the function button supports zeroing and tare adjustment for practical weighing workflows. Status feedback: SK6812 RGB programmable LED indication helps show operating state and user feedback. Mounting options: reserved M3 nut holes make the I2C weighing sensor easier to install in test fixtures. Development support: Arduino, UiFlow, Python workflows, internal firmware resources, and protocol documentation are available. Compact installation: the Mini Scales Unit measures 40 x 24 x 18mm and fits small embedded measurement projects. Specifications Sensor ADC Chip HX711 Microcontroller STM32F030F4P6, 32-bit Arm Cortex-M0 processor Communication Interface I2C communication @ 0x26 LED Indicator SK6812 RGB programmable Function Button Zero calibration and tare adjustment Weighing Capacity 5kg Bottom Mounting Nut M3 Product Size 40 x 24 x 18mm Package Size 136 x 92 x 24mm Product Weight 15.3g Gross Weight 22g Applications Scientific experiments: use the Mini Scales Unit for small-sample measurement and repeatable lab workflows. Industrial production: the HX711 weighing module can support small fixture weighing, verification, and process checks. Automation prototypes: add an I2C weighing sensor to compact M5Stack control nodes. Education: demonstrate load-cell measurement, tare adjustment, and I2C data reading with the Mini Scales Unit. Inventory and dispensing: use the HX711 weighing module for small-item weight detection in custom devices. Fixture monitoring: integrate the I2C weighing sensor into jigs that need a small digital weighing interface. Product List 1 Unit Mini Scales 4 M3 Nut (Hexagon 6 x 2.25mm) 1 HY2.0-4P Grove Cable (20cm) Other Content Weighing Board Note The official documentation notes that a weighing board should be installed onto the Mini Scales Unit to perform weighing. The top M3 mounting holes help fasten that board or a custom platform over the load-cell area, turning the HX711 weighing module into a more practical fixture-mounted I2C weighing sensor. I2C and Calibration Planning The HX711 weighing module communicates through Grove wiring with GND, 5V, SDA, and SCL. Address 0x26 allows the I2C weighing sensor to be read by an M5Stack host while the function button handles zero calibration and tare workflows. This lets the HX711 weighing module stay simple to wire while the I2C weighing sensor remains easy to integrate in software. Firmware and Protocol The internal firmware resources describe protocol behavior, including the update where v4 removed the absolute value limit of ADC changes to allow negative weight measurements while keeping the v3 protocol unchanged. This helps the Mini Scales Unit support more flexible weighing applications. Resources M5Stack Unit Mini Scales documentation Unit Mini Scales schematic PDF Unit Mini Scales model size PDF Load cell module datasheet PDF Unit Mini Scales Arduino library Unit Mini Scales UiFlow2 documentation Unit Mini Scales internal firmware Unit Mini Scales I2C protocol PDF FAQ What is the maximum weighing capacity? The Mini Scales Unit is specified for a maximum weighing capacity of 5kg. Which interface does it use? The HX711 weighing module outputs data through I2C communication at address 0x26. Can multiple units work together? Yes. The official feature list notes I2C communication with support for multiple parallel connections, which is useful for multi-point weighing layouts. What is included in the package? The official product list includes one Unit Mini Scales, four M3 nuts, and one HY2.0-4P Grove Cable (20cm). Is the official sale-page video included? Yes. The official MP4 demonstration video is embedded after the Description section, while the media gallery remains image-only.
