Uploaded July 2026 | Updated September 2026, 3 weeks ago

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Chain PIR is a pyroelectric infrared human presence sensing node in the M5Stack Chain series.
✨Features
✅STM32G031G8U6 main controller, Pyroelectric infrared human presence sensing
✅UART serial daisy-chain communication protocol & 1 x RGB LED
✅Supports two operating modes: Automatic reporting & Query
✅2 x HY2.0-4P expansion interfaces for connecting Chain series devices
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