The Unit Step16 is a 16-position rotary encoder with STM32G031G8U6, displaying real-time 0–F hex values on a 7-segment display. It communicates over I2C with configurable direction, modes, RGB LED colour, and address for multi-device setups.
M5 Stack Step16 Unit with 16-bit Rotary Encoder (GSMR-16) is a 16-position rotary encoder control unit based on the STM32G031G8U6 microcontroller. Its core function is to acquire the BCD value of the rotary encoder in real time and visualise the 0–F hex value through the integrated 7-segment display.
The device communicates via an I2C interface and supports configuration of the rotation increment direction, display operating mode, RGB LED colour, and I2C address, allowing multiple encoder units to be used on the same bus.
Featuring a clean and efficient design, it provides effective physical interaction control and real-time visual feedback, making it ideal for smart interactive devices (e.g., smart-home control panels), control interfaces (e.g., volume adjustment, RGB lighting control, motor speed regulation), and STEAM education hardware prototyping and teaching.
Features
16-position BCD rotary encoder
Integrated numeric display for encoder value
Adjustable display brightness and operating mode
Configurable clockwise/counter-clockwise direction
Programmable RGB LED colour/brightness
I2C communication with configurable address
Development Platform
UiFlow1
UiFlow2
Arduino IDE
Specifications
MCU
STM32G031G8U6, 32-bit ARM Cortex-M0+, 64 MHz
Step Encoder
16 positions, 8421 BCD code
Encoder Display
7-segment display
Programmable RGB
1 x WS2812
Value Update Cycle
100 ms
Interface
I2C @0x48, address range 0x08 ~ 0x77, data retained after power-off
Standby Current
DC 5 V @ 5.85 mA
Operating Current
Display LEDs 60%: DC 5 V @ 14.76 mA Display LEDs 100%: DC 5 V @ 24.13 mA RGB LED 100%: DC 5 V @ 18.9 mA Display LED + RGB: DC 5 V @ 29.91 mA
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