The TMOS PIR Unit is a high-sensitivity infrared sensor for detecting presence and motion. Using the STHS34PF80 chip, it communicates with M5 devices via I2C (default address: 0x5A). The sensor can monitor ambient temperature, and detect human presence and motion.
It can differentiate between stationary and moving objects and has an 80-degree field of view, providing a broad detection range. The unit also supports adjustable sampling frequency and gain modes, allowing it to adapt to various projects. It is ideal for use in alarm systems, smart lighting, and occupancy detection.
Notes
1. Set the TMOS gain mode: Default gain mode: High sensitivity, but it may cause sensor saturation. Saturation can lead to delayed updates of the motion/presence detection flag; Wide mode: Shorter detection distance, but avoids sensor saturation. 2. Sensitivity to temperature differences: The output signal of the TMOS sensor is very sensitive to the temperature difference between the sensor's own ambient temperature and the ambient temperature of the measurement room. This temperature difference can affect the sensor's measurement. 3. Power-down mode settings: When the device is in power-down mode, the register resets to its default value each time the device is started or restarted. The calibration temperature needs to be reset. Therefore, if the application requires covering a wide operating temperature range and the temperature difference between the room and the sensor's thermal coupling environment, you need to set the wide mode when the device starts.
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