This roller unit is a compact development board designed around high-precision rotary encoders, making it an ideal choice for interactive control, menu navigation, and parameter adjustment in embedded projects. This unit integrates the STM32F030 microcontroller, which enables local processing, signal decoding, and advanced control logic without overloading the main controller, thereby improving the responsiveness and flexibility of the system. This module is equipped with a standard I2C port, which can easily and reliably connect to cores for Arduino, ESP32, and other microcontroller platforms, reducing wiring complexity and simplifying system expansion. The built-in WS2812C RGB LED provides vivid visual feedback for status indication, mode display, progress bar, or user interaction prompts, helping you create a more intuitive and attractive interface. The roller unit has a compact appearance compatible with the M5Stack ecosystem, making it easy to integrate into existing projects, dashboards, control panels, and DIY electronic products. Color: As Shown Material: plastic Package Contents: 1 * roller unit development board 1 * line Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.