The Chain Angle features a built-in AB rotary encoder, supporting rotation direction detection and pulse counting, along with a center button for diverse input operations. It integrates a programmable RGB LED for customizable status indicators and interactive feedback, enhancing the user experience. Equipped with two HY2.0-4P expansion interfaces, it can connect to the main Chain DualKey controller and other Chain series devices via Chain Bridge to build an interconnected system. Compatible with for LEGO-compatible brick structures, supporting creative physical assembly and adapting to diverse installation and combination scenarios. Employing an STM32G031GBU6 core controller, it achieves stable data communication via UART serial port (115200bps@8N1). RGB startup power consumption is as low as 21.13mA, suitable for lightweight deployment requirements. Suitable for smart home control scenarios, enabling functions such as knob adjustment and button operation. Adaptable to human-computer interaction and smart home control scenarios, meeting diverse needs for creative interaction and intelligent control. Specifications: MCU: STM32G031G8U6 Input power: DC 5V Communication method: UART 115200bps@8N1 Interface specifications: 2x HY2.0-4P RGB LED: 1x WS2812C RGB power consumption: 21.13mA Rotation angle: 280°±10° Operating temperature: 0~40°C Color: As Shown Material: Plastic Package Contents: 1 * Chain Angle 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.