The M5Stack Chain PIR detects human presence using a pyroelectric infrared sensor, with a programmable RGB LED and daisy-chain connectivity for linking with other Chain series devices. The M5Stack Chain PIR is a pyroelectric infrared human presence sensing node in the M5Stack Chain series. It features a built-in pyroelectric infrared sensor and an integrated programmable RGB LED. It is suitable for applications such as human activity detection, smart home automation, and security alarms. Chain PIR integrates an STM32G031G8U6 data processor and uses a UART serial daisy-chain communication protocol. Its two HY2.0-4P expansion interfaces allow additional Chain series devices to be connected, enabling richer interactive applications. Features * M5Stack Chain series * Pyroelectric infrared human presence sensing * STM32G031G8U6 main controller * UART serial daisy-chain communication protocol * 1 x RGB LED * 2 x HY2.0-4P expansion interfaces for connecting Chain series devices * Two operating modes: * Automatic reporting mode: Automatically sends data to the host when the PIR status changes * Query mode: The host initiates a query, and the slave responds with the current PIR status Specifications MCU STM32G031G8U6 Power Input DC 5V Communication UART 115200bps@8N1 Interface 2 x HY2.0-4P RGB LED 1 x WS2812C Sensor AS312 Pyroelectric Infrared Sensor Maximum Detection Distance 2.4m Detection Angle ±60° Detection Interval 2s Operating Power Consumption 5V@10.74mA Product Size 23.9 x 23.9 x 22.3mm Product Weight 6.8g Resources * Documentation Package Contents * 1x Chain PIR (STM32G031) * 1x Chain Bridge