Description The M5Stack TMOS PIR Unit is a compact infrared presence sensor built around the STHS34PF80 chip for human presence, proximity, and motion detection. Unlike a simple motion trigger, the STHS34PF80 presence sensor uses thermal infrared sensing based on blackbody radiation principles, so it can detect both stationary and moving objects in smart devices. Designed for Grove-style M5Stack projects, the M5Stack TMOS PIR Unit communicates over I2C at the default 0x5A address and offers an 80-degree field of view with a detection range over 2 meters. This infrared presence sensor is useful when a project needs reliable occupancy awareness for lighting, security, lockers, furniture automation, or low-power IoT nodes. The official M5Stack sale page includes an MP4 demonstration video. It is embedded here after the description so customers can review how the STHS34PF80 presence sensor behaves before checking the detailed features and specifications. Features Thermal infrared detection: the infrared presence sensor detects human presence and motion through thermal radiation differences. STHS34PF80 sensing chip: the STHS34PF80 presence sensor supports presence detection, motion detection, ambient temperature monitoring, and object discrimination. Wide sensing view: 80-degree field of view helps the M5Stack TMOS PIR Unit cover doors, desks, shelves, and compact rooms. I2C interface: default I2C address is 0x5A, making integration simple with M5Stack controllers and custom MCU boards. Programmable output rate: 0.25Hz to 30Hz output data rate allows low-power monitoring or faster response. Configurable gain modes: default gain mode gives high sensitivity, while wide mode reduces saturation in demanding scenes. Small unit format: 32.0 x 24.0 x 5.2mm size keeps the M5Stack TMOS PIR Unit easy to mount in embedded enclosures. Presence and Motion Awareness The STHS34PF80 presence sensor can distinguish stationary and moving objects, giving a device more context than a conventional PIR motion-only module. For a smart lighting node, the infrared presence sensor can help keep lights active while a person remains nearby. Specifications Sensor Chip STHS34PF80 Communication Interface I2C @ 0x5A Detection Principle Thermal infrared sensing based on blackbody radiation Detection Type Presence detection, motion detection, proximity sensing, ambient temperature monitoring Measurement Range Over 2 meters Minimum Detectable Size 70 x 25 cm2 Field of View 80 degrees Programmable Output Data Rate 0.25Hz to 30Hz Infrared Wavelength 5 to 20 micrometers Infrared Sensitivity 2000 LSB/C Sensor Accuracy +/-0.3 C Gain Modes Default gain mode, wide mode Product Size 32.0 x 24.0 x 5.2mm Product Weight 4.5g Package Size 138.0 x 93.0 x 6.2mm Gross Weight 10.0g Applications Smart lighting: use the M5Stack TMOS PIR Unit to detect room occupancy and trigger lighting logic. Security and alarm systems: the STHS34PF80 presence sensor can monitor human presence in compact protected spaces. Furniture automation: integrate the infrared presence sensor into desks, cabinets, seats, or display fixtures. Smart lockers: add proximity and presence sensing for user detection near locker doors. IoT occupancy nodes: combine I2C sensing, small size, and programmable output data rate for compact connected devices. Human-machine interfaces: detect nearby users before activating displays, indicators, or control panels. Product List 1 Unit TMOS PIR 1 HY2.0-4P Grove cable, 20cm Other Content Gain Mode Notes Default gain mode gives the M5Stack TMOS PIR Unit high sensitivity, but saturation may delay updates to motion or presence flags. Wide mode shortens the sensing range but helps the STHS34PF80 presence sensor avoid saturation in scenes with strong thermal contrast. Temperature Difference Notes The output of the infrared presence sensor is sensitive to the temperature difference between the sensor environment and the measured room environment. For wide operating temperature ranges, the application should consider calibration and gain mode settings at startup. Installation Notes For best results, mount the STHS34PF80 presence sensor with a clear view of the target area. Keep the infrared presence sensor away from strong heat sources, then test the STHS34PF80 presence sensor response after the enclosure is assembled. In battery projects, tune the infrared presence sensor output data rate for the preferred balance between response speed and power use. Product Comparison TMOS PIR Unit U185 STHS34PF80, I2C 0x5A, 80-degree FOV, presence and motion detection PIR Unit U004 AS312, IO output, 100-degree FOV, motion detection Thermal2 Unit U149 MLX90640, I2C 0x52, 32 x 24 thermal imaging NCIR2 Unit U150 MLX90614, I2C 0x5A, single-point non-contact temperature sensing Resources Official M5Stack product documentation Official MP4 demonstration video FAQ What does this unit detect? The M5Stack TMOS PIR Unit detects human presence, proximity, motion, and ambient temperature changes through thermal infrared sensing. Which chip does it use? It uses the STHS34PF80 presence sensor, a thermal infrared sensor designed for presence and motion detection. How does it connect to a controller? The unit uses I2C communication with a default address of 0x5A. Is it only for moving people? No. This infrared presence sensor can help detect both stationary and moving objects, which is useful for occupancy sensing. What is included in the package? The package includes the Unit TMOS PIR and one 20cm HY2.0-4P Grove cable. Is there an official video? Yes. The official MP4 video is embedded directly after the Description section for the M5Stack TMOS PIR Unit.
