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Short answer: choose a battery PIR sensor for inexpensive, fast motion-triggered lights in hallways and other places where people keep moving. Choose a camera-free mmWave sensor when an automation must know that someone is still in a room—for example, reading at a desk, watching television, or sleeping. For zone-aware room automation, the Aqara FP2 is the most fully documented consumer option in this comparison; the Aqara FP1E is a simpler Zigbee choice, while Everything Presence One suits people who want local ESPHome control in Home Assistant. Combining PIR and mmWave usually gives the quickest trigger and the most persistent occupancy state.
What “presence” means in a smart-home system
Room occupancy and whole-home presence are related but different problems. A room sensor answers “is somebody in this room, and sometimes where in the room?” Whole-home presence asks “who is at home and where are they?” Home Assistant uses the latter meaning for presence detection. A hallway motion event cannot identify a person or prove that a room remains occupied after movement stops.
That distinction matters when choosing hardware. A light that should turn on as soon as someone walks through a corridor needs a quick motion event. A bathroom fan, office light, heating setback, or media rule may need an occupancy state that remains true while a person is nearly motionless. No single sensor is automatically best for both jobs.
How PIR, mmWave and camera-free sensors detect people
PIR: change in body heat, not continuous occupancy
Passive infrared (PIR) sensors watch for changes in infrared energy, usually the heat pattern produced when a person moves through the sensor’s field of view. They are inexpensive, widely supported, and commonly battery powered. A moving person crossing a doorway produces a clear event with very little setup.
#1 Best Overall
- [Installation Method] With the new installation method for the FP2, you can now mount it in the corner of a room. Just attach the included angle mount and switch to the corresponding mode in the app. This setting eliminates dead zones caused by the sensor’s angle and rotates the room layout by 45 degrees, allowing for enhanced zone detection and more automation options.
- [Multi-Person &Zone Positioning] The Aqara Presence Sensor FP2 can simultaneously detect up to 5 people and trigger different scenarios and automation.Moreover, the FP2(2.4GHz Wi-Fi REQUIRED) offers significant advantages over PIR infrared motion sensors by using a single radar sensor to monitor rooms of up to 40 m² (430 sq ft). You can also divide it into up to 30 zones, such as sofa, bed or desktop, etc. and set up individual automations for each zone. It is like having several PIR sensors at the same time with one Presence Sensor FP2. Please note: the FP2 is a wired sensor that should be constantly powered.
- [Sleep monitoring& Fall Detection] You can install FP2 next to the bed and select the sleep monitoring mode to sense the human body's sleep status in real time and generate a sleep health report.Moreover, you also can mount the FP2 on the ceiling and choose the Falling Detection Mode, which will detect and alert you through the app if someone falls. (Note: The FP2 is not a medical device, and can only be used for notification purposes)
- [Multi-Ecosystem Support] The Aqara Presence Sensor FP2 is exposed as multiple sensors to HomeKit, Alexa, Samsung SmartThings and Home Assistant. (Note: The device can be added directly to Home Assistant using HomeKit Controller integration) You can integrate the sensor easily without requiring an Aqara hub, which is a great solution for smart home enthusiasts. For a stable connection, ensure the sensor is placed within 6 meters (19 feet) of your router.
- [Ultra-High Precision, Privacy, and Enhanced Features]By implementing millimeter-wave radar technology, the Presence Sensor FP2 provides precise detection of movement without false negatives, even for slight movements. No camera monitoring system maximizes privacy. With IPX5, it can be installed in wet environments. Additionally, it has a built-in light sensor for flexible lighting automations (Only available in Aqara Home, HomeKit, and IFTTT). Automations of FP2 are executed without sending to the cloud and will keep working even if there is no internet connection.
The limitation is inherent in the detection method: when a person sits still, the heat pattern changes very little. Depending on the sensor, mounting angle and timeout, motion can clear even though the person is still in the room. PIR is therefore excellent for “motion started” logic, but it is a weak sole source for “someone is still here” logic.
mmWave radar: slight movement and stationary occupancy
Millimeter-wave (mmWave) radar emits radio energy and analyzes reflections from objects in the room. It can detect small movements, such as breathing or a slight shift in a chair, so it is better suited to occupancy that must remain active while someone is seated or sleeping. Aqara describes the FP2 as detecting “the slightest movements” without a camera.
Radar does not make placement irrelevant. Reflections from walls, furniture, fans, curtains or other moving objects can produce a persistent occupied state after a person has left. Sensitivity, detection distance, mounting height and room geometry all affect the result. A reliable installation includes a deliberate exit condition and a timeout rather than assuming every radar “occupied” report is an indisputable fact.
Camera-free privacy
Camera-free sensors do not create images of the room. Aqara says the FP2 is designed for privacy-sensitive presence detection and does not require camera monitoring. That makes radar attractive for bedrooms, bathrooms, offices and other spaces where a camera would be unacceptable. Privacy is not the same as local processing, however: a device can avoid images while still using a vendor cloud service. Check the integration and data path separately.
PIR versus mmWave at a glance
| Question | PIR | Camera-free mmWave |
|---|---|---|
| Primary detection objective | Movement or a change in heat pattern | Presence and slight movement, including a person who is nearly still |
| Best room types | Hallways, entrances, stairs and pass-through areas | Offices, bedrooms, living rooms and any room where people sit or sleep |
| Stationary person | May clear after the motion timeout | Designed to maintain occupancy when slight movement is detectable |
| Spatial detail | Usually a sensor-wide motion area | Some models provide zones; others report only the room |
| Power options | Battery models are common and low maintenance | Continuous wired power is common; battery operation is not assumed |
| Setup effort | Mount and set a motion timeout | Mount, aim, tune sensitivity and calibrate around furniture and reflections |
| Typical failure mode | False “clear” when somebody stops moving | False “occupied” caused by reflections, poor placement or incomplete exit logic |
| Privacy | No camera image | No camera image; verify whether integration traffic is local or cloud-based |
There is no defensible universal accuracy percentage for PIR versus mmWave. Performance depends on the room, mounting position, firmware, sensitivity and automation logic. Treat marketing language such as “without producing false negatives” as a manufacturer claim, not an independently verified accuracy result.
Which sensor is best for common room-automation jobs?
Fast hallway and stair lighting: PIR
Use PIR when the desired sequence is simple: detect movement, turn lights on, then turn them off after a short delay. A battery PIR can be placed near a doorway without running a power cable, and its limited detection objective makes calibration straightforward. In a corridor, a person normally keeps moving, so the stationary-occupancy weakness rarely matters.
Rank #2
- [Precise AI-Powered Presence Sensor] Powered by advanced AI, PIR, and 60GHz mmWave radar, the FP300 accurately detects human presence even when you’re still. Its adaptive AI learning continuously optimizes sensitivity to reduce false triggers, ensuring lights and devices stay on even when you’re lounging on the couch, and off when they need to be.
- [Broad Compatibility] Supports Matter over Thread and Zigbee for seamless integration with major ecosystems. Works with Apple Home, Home Assistant, Alexa, Google Home, SmartThings, and Homey via Matter for flexible, reliable automation. (* For third-party Matter ecosystems, a corresponding Thread Border Router and Matter Controller are required. * For Aqara, a Zigbee 3.0 or Matter hub like M200/M3/G410/etc, except G2H, with the latest firmware is needed.)
- [5-in-1 Multi-Sensor] Combines 60GHz mmWave, PIR, light, temperature, and humidity sensors into one compact device. This all-in-one design enables precise detection of presence and environmental conditions, helping automate lighting, climate control, and security systems for a smarter and more energy-efficient home.
- [Long Battery Life & Energy Efficiency] Powered by two replaceable CR2450 batteries, the FP300 offers up to 3 years of battery life in Zigbee mode or 2 years in Thread mode. Optional sensor deactivation helps conserve energy, ensuring consistent and long-lasting performance. What's Included: FP300 Multi-Sensor × 1, Sticker × 1, User Manual × 1
- [Wire-Free & Flexible Installation] Completely wireless with a multi-axis adjustable mount for easy wall, ceiling, or corner setup. No wiring required—relocate anytime for optimal detection and coverage. Featuring a 120° field of view and up to 6 m (20 ft) of detection range, the FP300 can effectively monitor various room layouts. Its minimalist design blends seamlessly into any modern interior, delivering powerful functionality without visual clutter.
Desk, sofa and bed occupancy: mmWave
Choose mmWave when turning the light or HVAC off because somebody paused would be annoying or unsafe. A person working at a desk, reading on a sofa or sleeping may generate too little movement for PIR. Radar can keep the occupancy state alive when it detects slight movement, giving the automation a better basis for delaying shutoff.
Doorway and entry confirmation: combine both
A PIR can provide an immediate “movement began” event, while mmWave supplies the longer-lived “room remains occupied” state. This combination avoids waiting for radar processing before turning on a light and avoids relying on PIR to prove that a seated person is still present. Use one sensor as the trigger and the other as a condition, rather than allowing contradictory independent rules to fight over the same light.
Zone-specific actions: a zone-capable mmWave model
Desk, bed, sofa and doorway automations require spatial separation. A room-level occupancy sensor cannot reliably tell whether the occupant is at the desk or on the sofa. Use zones only when the selected model supports them and the mounting position gives those areas a clear radar view. More zones increase the value of careful calibration; they do not remove the need for it.
Consumer options documented for Home Assistant users
| Device | Detection and spatial capability | Integration and power | Best fit | Main trade-off |
|---|---|---|---|---|
| Aqara Presence Sensor FP2 | Camera-free mmWave; coverage up to 40 m² (430 sq ft); up to 30 customizable zones; up to five people simultaneously | Constant wired power; supports Home Assistant, HomeKit, Alexa and Google Home. Aqara says wall mounting gives the best zone positioning and multi-person results. | Zone-aware room automation and multiple occupants | Wired installation and more calibration than PIR; availability and firmware can change |
| Aqara FP1E | Zigbee mmWave for stationary room occupancy; no zones | Direct use with ZHA or Zigbee2MQTT; requires a compatible Zigbee network and powered placement | Room-level occupancy in a Zigbee-based Home Assistant setup | No zone tracking, so it cannot distinguish desk, bed or sofa reliably |
| Everything Presence One | Whole-room occupancy; no zone tracking | Native ESPHome local control; intended for Home Assistant users who accept a higher setup effort | Local, configurable occupancy logic without a vendor cloud dependency | More involved installation and configuration than a ready-made PIR |
The FP2’s published figures are product specifications from Aqara’s current product page, not a guarantee that every room will achieve those boundaries. The FP2 launch announcement dated April 20, 2023 said it used mmWave radar to address limitations of traditional PIR sensors and was available through Aqara Amazon brand stores in North America and Europe. Current stock, regional availability, firmware behavior and integration support should be checked when buying.
Choosing between the FP2, FP1E and Everything Presence One
Pick Aqara FP2 for zones and multiple people
The FP2 is the clearest choice when a single room needs several areas—such as a desk, bed and doorway—or when the automation must account for more than one person. Aqara documents up to 30 customizable zones and simultaneous detection of up to five people, with coverage up to 40 m² (430 sq ft). Wall mounting is recommended by Aqara for zone positioning and multi-person detection.
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Rank #3
- [Zone Positioning] The Aqara Presence Sensor FP2 (2.4GHz Wi-Fi REQUIRED) offers significant advantages over PIR infrared motion sensors by using a single radar sensor to monitor rooms of up to 40 m² (430 sq ft). You can also divide it into up to 30 zones, such as sofa, bed or desktop, etc. and set up individual automations for each zone. It is like having several PIR sensors at the same time with one Presence Sensor FP2. Please note: the FP2 is a WIRED sensor that should be constantly powered.
- [Multi-Person & Fall Detection] The FP2 can simultaneously detect up to 5 people and trigger different scenarios and automation. Moreover, you can mount the FP2 on the ceiling and choose the Falling Detection Mode, which will detect and alert you through the app if someone falls. (Note: The Falling Detection Mode is only availabe when you mount the FP2 on the ceiling. The FP2 is not a medical device, and can only be used for notification purposes)
- [Multi-Ecosystem Support] The Aqara Presence Sensor FP2 is exposed as multiple sensors to HomeKit, Alexa, Google Home and Home Assistant. (Note: The device can be added directly to Home Assistant using HomeKit Controller integration. Please connect the FP2 to Aqara home before enabling skills in Google Home and Alexa.) You can integrate the sensor easily without requiring an Aqara hub, which is a great solution for smart home enthusiasts. The dimension of Aqara FP2: 2.51*2.51*1.14 inch.
- 【Super-Crisp 2K Resolution & 360° Viewing and Night Vision】(Note: A 5V 2A USB-A power supply is required and is not included.) Experience crystal-clear surveillance with a high-resolution 2304 × 1296 pixel sensor and a wide-angle f/2.0 lens. The Pan/Tilt motor allows for a full 360° viewing angle which enhances the person tracking feature. The E1 also includes a 940 nm infrared backlight designed not to disrupt your sleep during nighttime use. (The Camera E1 uses an industry-standard USB-C port.
- 【HomeKit Support & Wide Compatibility】The Camera E1 provides full support for HomeKit Secure Video (An active iCloud subscription and an Apple Home hub is required), including end-to-end encryption and local recognition, which ensures protection against data theft and safeguards your privacy at home. Moreover, thanks to Aqara Home scenes, the Pan&Tilt mechanism, Privacy Mode, and other functionalities can be controlled on third-party platforms like HomeKit, Alexa and IFTTT.
Pick FP1E for straightforward Zigbee room occupancy
The FP1E is appropriate when the requirement is simply “keep this room occupied while someone is sitting still” and the home already uses Zigbee. It can be used directly through ZHA or Zigbee2MQTT and does not provide zones. That limitation is useful to state up front: it can support room-level lights or climate rules, but not dependable desk-versus-sofa decisions from one device.
Pick Everything Presence One for a local ESPHome path
Everything Presence One is aimed at users who prefer native ESPHome local control and whole-room occupancy in Home Assistant. It offers no zone tracking, and the comparative documentation describes a higher setup effort. In return, the local architecture can be attractive when resilience during an internet outage, inspectable configuration and long-term control matter more than appliance-style simplicity.
How to design reliable automations
1. Define the state you actually need
Write the requirement as a state transition before choosing hardware. “Turn the hall light on when motion starts” is a PIR problem. “Do not turn the office light off while anyone is at the desk” is a stationary-occupancy problem. “Turn on the lamp only when the sofa is occupied” is a zone problem. “Know which household member is home” is whole-home presence and needs identity-capable signals in addition to room sensors.
2. Put the fast trigger and the persistent condition in separate roles
For a combined installation, let PIR start the light quickly. Let mmWave occupancy prevent shutoff while the room remains occupied. This avoids a slow or overly conservative initial response while protecting against the classic PIR failure in which a seated person is treated as gone.
3. Add an explicit exit and timeout policy
Radar can continue to report occupancy after somebody leaves if a reflection, fan, curtain or unsuitable angle is being interpreted as movement. Build a clear path to “vacant”: require the occupancy signal to be clear for a defined period, and include a maximum runtime or an independent doorway event where the consequence of a stuck state is costly. The exact timeout depends on the room and the automation; a bedroom light, bathroom fan and heater should not necessarily share one value.
4. Use zones only for decisions they can support
Create a desk zone only if the sensor can separate the desk from nearby furniture at its installed angle. Keep the doorway or hallway out of a zone if passers-by would constantly count as desk occupancy. For multi-person rooms, test each person’s likely path and seating position rather than assuming the maximum published person count applies equally in every layout.
Rank #4
- [Zone Positioning] The Aqara Presence Sensor FP2 (2.4GHz Wi-Fi REQUIRED) offers significant advantages over PIR infrared motion sensors by using a single radar sensor to monitor rooms of up to 40 m² (430 sq ft). You can also divide it into up to 30 zones, such as sofa, bed or desktop, etc. and set up individual automations for each zone. It is like having several PIR sensors at the same time with one Presence Sensor FP2. Please note: the FP2 is a WIRED sensor that should be constantly powered.
- [Multi-Person & Fall Detection] The FP2 can simultaneously detect up to 5 people and trigger different scenarios and automation. Moreover, you can mount the FP2 on the ceiling and choose the Falling Detection Mode, which will detect and alert you through the app if someone falls. (Note: The Falling Detection Mode is only availabe when you mount the FP2 on the ceiling. The FP2 is not a medical device, and can only be used for notification purposes)
- [Multi-Ecosystem Support] The Aqara Presence Sensor FP2 is exposed as multiple sensors to HomeKit, Alexa, Google Home and Home Assistant. (Note: The device can be added directly to Home Assistant using HomeKit Controller integration. Please connect the FP2 to Aqara home before enabling skills in Google Home and Alexa.) You can integrate the sensor easily without requiring an Aqara hub, which is a great solution for smart home enthusiasts. The dimension of Aqara FP2: 2.51*2.51*1.14 inch.
- [Note] The Aqara Hub M1S Gen 2 requires a secure 2.4 GHz Wi-Fi network connection. Each Aqara Hub M1S Gen 2 can link with up to 128 Aqara devices, requiring Aqara Zigbee repeaters. Utilizing the latest Zigbee 3.0 protocol ensures compatibility with all existing and newest Aqara devices based on the quickest, most stable, and energy-efficient technology. Additionally, the M1S Gen 2 supports WPA3, the latest Wi-Fi security specification, enhancing security and reliability.
- [Wireless Command Center] The Hub M1S Gen 2 seamlessly connects all Aqara devices, enabling integration across Aqara’s sensors and home automation devices. It facilitates control of connected lights and appliances from your smartphone. Use the Aqara Home app to set schedules, timers, and scenes, simplifying home management. The Hub M1S Gen 2 collaborates with all Aqara devices (excluding devices from other brands) to establish a comprehensive, smart home automation system.
5. Prefer local control when the requirement is privacy or resilience
Local integrations keep automations working when the internet or a vendor service is unavailable and reduce the amount of room-state data sent outside the home. Home Assistant users should verify the current integration path, firmware requirements and whether each entity is available locally. “No camera” describes the sensing modality; it does not by itself prove that all telemetry is local.
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- Map the room: mark the bed, desk, sofa, doorway, fans, curtains and reflective surfaces before fixing the sensor.
- Use the manufacturer’s recommended orientation: Aqara says FP2 wall mounting provides the best zone positioning and multi-person detection.
- Keep the field of view intentional: avoid including a busy corridor or an adjacent room unless that area is meant to count as occupied.
- Power for the real installation: the FP2 needs constant wired power; battery PIR is easier where no cable is available.
- Calibrate with normal furniture in place: moving a chair, screen or cabinet after calibration can change radar reflections and zone boundaries.
- Test stillness: sit at the desk, lie in bed and remain quiet long enough to exceed the PIR timeout. Confirm that the mmWave occupancy state remains active.
- Test departure: leave by the normal doorway, close doors and wait through the intended clear period. Check for a stuck occupied state.
- Test false triggers: run fans, HVAC, curtains and other moving equipment; adjust placement or sensitivity if those activities hold occupancy indefinitely.
- Record recovery behavior: decide what the light, fan or climate device should do if the sensor becomes unavailable or reports occupied for an unusually long time.
Common failure modes and fixes
“The PIR turns the light off while I am reading.”
The sensor has correctly stopped seeing enough movement for its configured timeout. Replace it with mmWave for that room, or use mmWave occupancy as the condition that blocks shutoff. Extending a PIR timeout can reduce annoyance but also leaves lights on after a genuine departure and does not create true stationary detection.
“The mmWave sensor says occupied after everyone leaves.”
Check mounting angle, detection boundaries and nearby moving objects first. Fans, curtains, HVAC airflow and reflections can keep radar active. Recalibrate with the room in its normal arrangement, exclude the offending area if the model supports it, and require a sustained clear state before declaring the room vacant.
“My zone automations confuse the desk and sofa.”
Zone accuracy is a geometry problem, not just a software setting. Reposition the sensor so the two areas are separated in its view, reduce overlapping zones and keep furniture layout stable. If the room cannot provide clean spatial separation, use room-level occupancy instead of pretending the zone result is precise.
“The sensor works in the vendor app but not in Home Assistant.”
Check whether the device is using a cloud integration, a local integration, Zigbee, or ESPHome, and confirm firmware compatibility. FP1E is documented for direct ZHA or Zigbee2MQTT use; Everything Presence One is documented around native ESPHome local control; FP2 supports Home Assistant among its listed ecosystems. Integration behavior can change with firmware and platform updates.
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Radar processing generally needs more continuous power than a simple PIR design. The FP2 specifically requires constant wired power. Use a battery PIR for low-maintenance door and hallway placements, or provide a permanent outlet and cable path for mmWave where stationary occupancy is the priority.
Decision guide
| Your requirement | Recommended approach | Why |
|---|---|---|
| Low-cost hallway lights | Battery PIR | Fast movement trigger, simple setup and no cable |
| Office or bedroom where people sit or sleep | Camera-free mmWave | Maintains occupancy from slight movement |
| Immediate light-on plus reliable keep-on state | PIR plus mmWave | Combines fast activation with stationary occupancy |
| Desk, bed, sofa or doorway automations | Aqara FP2, if its wall-mounted view fits the room | Up to 30 documented zones and up to five simultaneous people |
| Room-level Zigbee occupancy without zones | Aqara FP1E | Direct ZHA/Zigbee2MQTT path and stationary occupancy detection |
| Local ESPHome/Home Assistant control | Everything Presence One | Native ESPHome local control and whole-room occupancy |
| Whole-home “who is home?” presence | Use room sensors as one input, not the entire solution | Room occupancy does not identify people or provide whole-home location by itself |
What to verify before purchase
- Whether the device is room-level or zone-capable, and how many people it is documented to track.
- Whether it needs continuous wired power, a Zigbee coordinator, an ESPHome-capable network, or a vendor account.
- Whether your preferred Home Assistant integration is local, cloud-based, or dependent on a particular firmware version.
- Whether the mounting position covers only the intended room and avoids fans, curtains and adjacent traffic.
- Whether current regional availability and software support match the product documentation; these details are volatile.
Verdict
For motion-triggered lights in places where people keep moving, PIR remains the sensible low-cost choice. For room automation that must recognize a person who is seated, reading or sleeping, camera-free mmWave is the better technology. Choose the FP2 when zones and multiple occupants justify wired installation and calibration, the FP1E when straightforward Zigbee room occupancy is enough, and Everything Presence One when local ESPHome control is the priority. In demanding rooms, use PIR for the immediate trigger and mmWave for the occupancy hold, with deliberate clear-time and timeout logic to handle radar false occupancy.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
