Chain Key
SKU:U206
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 |
Schematics
1/1
PinMap
RGB LED
| STM32G031 | PA8 |
|---|---|
| WS2812C | RGB |
Button
| STM32G031 | PB0 |
|---|---|
| Button | Input |
UART
| STM32G031 | PB6 | PB7 | PA2 | PA3 |
|---|---|---|---|---|
| UART1 | TXD1 | RXD1 | ||
| UART2 | TXD2 | RXD2 |
Model Size
Softwares
Arduino
Protocol
Video
- Chain Key product introduction and functionality demonstration