Chain Mechanical Key Button (STM32G031)

Description

Chain Key is a single-button input node in the M5Stack Chain series. The button adopts a hot-swappable mechanical keyboard design with a blue tactile switch and integrates a programmable RGB LED. It is suitable for human-machine interaction and smart home control scenarios.

Chain Key integrates an STM32G031G8U6 core MCU and uses a UART serial cascading communication protocol. Through two HY2.0-4P expansion interfaces, it can connect more Chain series devices, enabling more complex and interactive applications.

Features

• M5Stack Chain series
• Single button input
• STM32G031G8U6 core MCU
• Hot-swappable mechanical keyboard blue switch
• 2x RGB LED
• Uses UART cascading communication protocol
• 2x HY2.0-4P expansion interfaces to extend Chain series devices

Includes

• 1 x Chain Key
• 1 x Chain Bridge
• 1 x Keycap Sticker

Applications

• Smart home control
• Human-machine interaction

Specifications

Specification	Parameter
MCU	STM32G031G8U6
Input Power	DC 5V
Communication Interface	UART
Interface Spec	2x HY2.0-4P
RGB LED	2x WS2812B
Working Power Consumption	28.24mA
Working Temperature	0 ~ 40°C
Product Size	23.9 x 23.9 x 34.4mm
Product Weight	9.1g
Package Size	138.0 x 93.0 x 26.0mm
Gross Weight	14.4g

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