M5Stack TMOS PIR (U185) – presence sensor for people sitting still (STHS34PF80)

Regular PIR sensors have a well-known problem: sit still and the light goes out. The TMOS PIR solves it differently from mmWave radar. It measures infrared radiation with a thermal sensor (ST STHS34PF80) and can therefore tell an empty chair from a chair with a person in it.

It is a good choice in rooms where you don't want radar, such as bedrooms, or where an mmWave sensor triggers on movement through walls.

This is the sensor in M5Stack's official Home Assistant guide, together with the AtomS3R.

Works with

• Home Assistant (M5Stack's official example)
• ESPHome via I2C
• All M5Stack controllers with a Grove port

You also need

A controller and a Grove cable.

mmWave or TMOS?

mmWave (LD2410C) sees through thin materials and has a longer range, which suits living rooms and offices. TMOS reacts to body heat, doesn't trigger through walls and is more stable in small rooms.

Specifications

• Sensor: STHS34PF80, thermal infrared
• Range: up to approx. 4 m
• Detects: motion, presence without motion, temperature difference
• Interface: I2C (Grove), address 0x5A

Documentation and certification

• Product documentation (M5Stack)
• Home Assistant guide from M5Stack
• Manufacturer certifications (CE/RoHS)

Manufacturer: M5Stack Technology Co., Ltd, Block A10, Expo Bay South Coast, Fuhai Street, Bao'an District, Shenzhen, China, [email protected]. EU representative: Success Courier SL, Calle Rio Tormes 1, Planta 1, Derecha, Oficina 3, 28947 Fuenlabrada, Madrid, Spain, [email protected].

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