描述
Motion sensors have a fundamental flaw: they only see movement. A person reading in a chair is invisible to them, and the lights go out on someone who has not moved a muscle for four minutes. The Sentinel replaces motion with presence. A 24 GHz millimetre wave radar reads micro-movement, including breathing, so a room stays lit while a body is in it and darkens only when the room is genuinely empty.
The radar is paired with passive infrared and a light sensor, and the three inputs are weighted rather than stacked. Detection reaches six metres with a 120 degree field, the beam spreads 94 degrees on the horizontal plane and 114 on the vertical, and the light sensor reads ambient conditions from zero to twelve thousand lux so a bright afternoon does not trigger the same response as a dark evening. Hold time is adjustable from ten seconds to ten minutes, which is the difference between a corridor light and a bathroom light.
Power comes from a single CR2450 coin cell, and average draw sits at or below fifty microamps, so the device runs for months rather than days on a battery it does not have to announce. It joins a Tuya or Smart Life Zigbee network, which means it can drive automations directly: presence in the study dims the hallway, presence in the hallway raises the kitchen light to a working level, and absence closes everything down without a schedule being written for it.
A room that knows you are in it is not a luxury. It is the first honest form of automation.
Key Features
- ✦24 GHz mmWave radar detecting presence through micro-movement, not motion alone
- ✦Combined radar, PIR and 0 to 12000 lux light sensing in one housing
- ✦Six metre detection radius with a 120 degree field of view
- ✦Adjustable hold time from 10 seconds to 10 minutes per zone
- ✦CR2450 coin cell with average draw at or below 50 microamps
- ✦Tuya Smart and Smart Life Zigbee integration for scene and automation triggers
- ✦Ambient light gating so daylight does not fire the same automation as night
- ✦IP20 rated housing for interior mounting at 1.2 to 2 metres
Technical Specifications
- Sensing technology: 24 GHz mmWave radar with PIR and light sensor
- Detection range: Up to 6 m, adjustable
- Detection angle: 120 degrees
- Beam angle: 94 degrees XZ plane, 114 degrees YZ plane
- Light sensing: 0 to 12000 lux
- Delay time: 10 to 600 seconds, adjustable
- Protocol: ZigBee 2.4 to 2.425 GHz
- Platform: Tuya Smart, Smart Life
- Power: CR2450 coin cell, 2 to 3.3V DC
- Consumption: Average operating current at or below 50 microamps, 150 microwatt
- Mounting height: Side mount 1.2 to 2 m
- Operating range: Minus 10 to plus 50 degrees Celsius, up to 95 percent RH
- Rating: IP20, interior use
Where It Belongs
This is a sensor for the rooms where people sit still. Home offices, reading corners, bathrooms and nurseries are the four places PIR sensors fail most often, because stillness is normal behaviour there rather than absence. Commercial buyers fit it in meeting rooms and washrooms where a schedule-based lighting system wastes energy on empty hours, and in retail fitting rooms where a light must stay on for the person inside and switch off the moment they leave. Because the light sensor is part of the same device, one unit can hold a room at a comfortable level instead of switching hard on and off.
Frequently Asked Questions
Q: How is this different from a normal PIR motion sensor?
A PIR sensor detects heat movement, so it drops a still person after its timer expires. The Sentinel adds 24 GHz radar that reads micro-movement such as breathing, so presence is maintained while someone sits, reads or works at a desk without moving their torso.
Q: Does it need a hub or a neutral wire?
It needs a Tuya or Smart Life Zigbee gateway to join your network, and no neutral wire because it runs from a coin cell. Pairing is done by holding the button until the LED indicates pairing mode, then confirming in the app.
Q: How often do I need to change the battery?
Average draw sits at or below fifty microamps, so a CR2450 typically lasts months of normal use rather than weeks. The app reports battery level, and the device warns before the cell drops below a workable threshold.
Q: Can it tell the difference between a person and a pet?
The radar distinguishes presence from absence rather than species. For rooms where pets move freely, raise the mounting height within the supported 1.2 to 2 metre range and reduce detection sensitivity so smaller bodies at floor level fall outside the primary detection lobe.
Q: Will bright daylight trigger the automation?
No. The light sensor reads ambient conditions up to twelve thousand lux and gates the automation accordingly, so a sunlit room does not fire a lighting scene. Set the lux threshold in the app to match the room.
Q: Can it trigger different scenes for different rooms?
Yes. Each device is an independent Zigbee node in the Tuya app, so hold time, lux threshold and the scenes it triggers are configured per sensor. One gateway can run several Sentinels on separate automations.
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