The Chain Angle is a 🎛️ potentiometer‑based input node in the M5Stack Chain series. As the knob rotates, the sampling‑terminal voltage changes within a defined range. The built‑in MCU performs ADC conversion and outputs a signal with up to 12‑bit resolution. A 🌈 programmable RGB LED is integrated for status indication and interactive visual feedback, making the module ideal for human‑machine interfaces, 🏠 smart home systems, and ⚙️ motor speed control. 🧠 Core & Connectivity Powered by an STM32G031G8U6 MCU, Chain Angle communicates using a UART serial cascade protocol. With two HY2.0‑4P expansion ports, you can easily connect additional Chain‑series devices to build richer, more scalable interactive applications 🔗✨ Features 🔗 M5Stack Chain Series module 🎚️ Potentiometer knob input for smooth analog control 🧠 STM32G031G8U6 core MCU for stable, low‑power processing 🌈 1× RGB LED for status indication and interactive feedback 🔌 UART serial cascade communication protocol for easy multi‑device chaining 🔄 2× HY2.0‑4P expansion interfaces for extending additional Chain‑series devices Includes 1 x Chain Angle 1 x Chain Bridge Applications 🏠 Smart home control — intuitive knob input for lighting, scenes, HVAC, and device adjustments 🤝 Human‑machine interface (HMI) — smooth analog interaction for menus, parameter tuning, and UI navigation 🔊 Volume control — precise adjustment for speakers, audio panels, and multimedia devices ⚙️ Motor speed control — stable analog input for fans, pumps, and small motor systems Specifications Specification Parameter MCU STM32G031G8U6 Input Power DC 5V Communication UART 115200bps@8N1 Interface 2x HY2.0-4P RGB LED 1x WS2812C RGB Power On Consumption 21.13mA Rotation Angle 280° ±10° Operating Temperature 0 ~ 40°C Product Size 23.9 x 23.9 x 28.2mm Product Weight 8.4g Package Size 138.0 x 93.0 x 26.0mm Gross Weight 11.7g Learn Use the Chain Bridge connector to link the main controller Chain DualKey with other Chain‑series input modules. When making the connection, be sure to check the orientation: ➡️ The triangular arrow must point outward from the main controller (Chain DualKey), exactly as shown in the illustration below. Schematics PinMap RGB LED STM32G031 PA8 WS2812C RGB Angle STM32G031 PB0 Angle ADC_Input UART STM32G031 PB6 PB7 PA2 PA3 UART1 TXD1 RXD1 UART2 TXD2 RXD2 Model Size Softwares Arduino Chain Angle Arduino Getting Started Guide
