The Chain Encoder is a Chain-series rotary encoder module with direction detection, pulse counting, push-button input and an RGB status LED. It supports UART daisy-chaining via dual HY2.0-4P ports and includes LEGO-compatible mounting holes. The Chain Encoder is a rotary encoder input node in the M5Stack Chain series, designed for reliable dial-based control in interactive projects. It includes an internal AB rotary encoder, supporting rotation direction detection and pulse counting, and the centre of the knob also works as a push-button input. A programmable RGB LED is built in for clear status indication and visual feedback. For more flexible builds, the encoder cap includes LEGO-compatible mounting holes, making it easy to integrate into creative structures or modular enclosures. It’s a good fit for applications such as human–machine interaction, control panels, and smart home control. The Chain Encoder is powered by an STM32G031G8U6 controller and communicates using a UART serial daisy-chain protocol. With two HY2.0-4P expansion ports, you can connect additional Chain series modules to build more complex and feature-rich interactive systems. Features * M5Stack Chain series * AB rotary encoder * Button input * STM32G031G8U6 core controller * 1 x RGB LED * LEGO-compatible mounting structure * Uses UART serial daisy-chain communication protocol * 2 x HY2.0-4P expansion interfaces for Chain series device expansion Specifications MCU STM32G031G8U6 Input Power DC 5V Communication UART 115200bps@8N1 Interface 2 x HY2.0-4P RGB LED 1 x WS2812B RGB On Power 22.51mA Operating Temp 0 ~ 40°C Product Size 23.9 x 23.9 x 29.8mm Product Weight 10.0g Resources * Documents Package Contents * 1x Chain Encoder * 1x Chain Bridge