5/5 beoordeling
Shipped by the next business day.*

CeilSense.nl

Important Product Update - Improved Connection (June 27, 2025)

Great news! Based on your feedback, we've made important improvements to CeilSense:
• Connections moved from side to top for easier installation • BMP388 pressure sensor added for more accurate CO₂ calibration
Note: For UTP use, add ~15mm connector length to the 45mm installation depth.

CeilSense

New

Your All-in-One
Built-in Smart Sensor

CeilSense combines powerful sensor technology with an elegant built-in solution for your ceiling or wall. Perfect for installation in a standard 68mm ceiling opening or junction box, powered via mains voltage, USB-C or PoE for a fully integrated smart home solution.

Made for
🏠 Home Assistant Compatible ⚡ Built on ESPHome
CeilSense

Discover the CeilSense: A carefully handcrafted Dutch creation, fully developed and designed for your needs.

Specially designed for Home Assistant & ESPHome: The CeilSense is specially designed to integrate seamlessly with Home Assistant & ESPHome.

Choose your CeilSense experience

CeilSense is available in two variants and different timelines. Choose the configuration that best fits your needs.

CeilSense Basic

Motion and status lighting

Perfect motion detection and ambient lighting

– mmWave radar motion sensor (detection even when sitting still)

– 16 RGB LED status & ambient lighting

– Lux sensor for automatic light measurement

– Plug & play installation

From €55

⚡ Perfect entry model for motion & ambient lighting!

Beta closed

🔬 Beta Test Basic

Beta program ended

€45,-

(Reduced beta rate)

Beta closed

The beta program has ended. Choose the launch edition.

Pre-order

🚀 Launch Edition Basic

Order for August delivery

€55,-

(Intro price - later €60)

Pre-order now for delivery in August 2025

Pre-order now

CeilSense Complete

Recommended

Complete environmental monitoring

Complete environmental monitoring and automation

✓ Everything from Basic +

– Air quality (CO₂ measurement)

– Climate (temp + humidity)

– Smart automation

From €75

💰 Only €20 extra for 3 climate sensors!

Beta closed

🔬 Beta Test Complete

Beta program ended

€65,-

(Reduced beta rate)

Beta closed

The beta program has ended. Choose the launch edition.

Pre-order

🚀 Launch Edition Complete

Order for August delivery

€75,-

(Intro price - later €80)

Pre-order now for delivery in August 2025

Pre-order now

Smart home. Smart sensors.

Everything you need in one sensor

CeilSense integrates multiple advanced sensors into one elegant built-in device. Detect movement (even breathing), measure environmental factors and create ambience with 16 RGB LEDs - all installed in a standard spot hole in your ceiling or junction box in your wall.

Advanced motion detection

The HLK-LD2412 24GHz FMCW mmWave sensor detects even the smallest movements, such as breathing, through obstacles. With a range up to 9 meters, ±75° detection angle and 0.75m resolution, lights and devices stay on even when you're sitting still.

Indoor climate monitoring

The built-in SCD41 module accurately measures CO₂ concentration, humidity and temperature. Create a healthier living climate by linking automatic ventilation to your measurements.

Smart RGB lighting

16 individually addressable WS2812 RGB LEDs that you can use as mood lighting, status indicator for air quality, alarm notifications, reminders, or subtle night light. Fully programmable via Home Assistant.

Flexible power options

Choose from three power options: mains voltage (110-240 VAC) when replacing a spot, USB-C (5V) for easy installation, or Power over Ethernet (PoE) for combined data and power.

Seamless integration

Directly connects to Home Assistant via WiFi or Ethernet. Thanks to ESPHome support, all sensors are automatically recognized and you can quickly set up dashboards and automations.

Elegant built-in

Fits perfectly in standard 68mm openings (standard GU10 spot hole). Simply replace existing spots or use junction boxes in ceiling or wall. Spring clips ensure a sturdy, neat finish that barely stands out in your interior.

Illuminate and communicate

16 individually addressable WS2812 RGB LEDs

Use the built-in LEDs as mood lighting, status indicator for air quality (like red for poor CO₂ levels, green for optimal) or as a subtle night light. Fully customizable and programmable via Home Assistant for every room in your home.

RGB LED visualisatie
WS2812 LEDs

Versatile applications

Night light

A soft, warm light that automatically activates with motion detection at night - perfect for hallways, staircases and bathrooms, without having to turn on bright lights.

Status indicator

Visualize environmental values and notifications through color changes: green for optimal air quality, red for poor CO₂ levels or alarms, orange for reminders (waste collection), blue for cooling active - make data and alerts instantly understandable.

Ambient lighting

Create the perfect mood with subtle ambient lighting in any desired color, automatically tuned to the time of day or events in your smart home.

Note for prolonged LED use

The LEDs can generate heat that affects temperature measurement and therefore other sensor values (CO₂, humidity). Keep this in mind during prolonged intensive use.

Compact design

Powerful technology in an elegant housing

With dimensions of only Ø 68 × 45 mm, CeilSense fits perfectly in any standard GU10 spot hole. The thoughtful design combines all advanced sensor technology in one compact unit that seamlessly blends into your interior.

Top view

CeilSense bovenaanzicht
16 RGB LEDs in a ring for perfect light distribution
Central mmWave sensor for ±75° coverage
Minimalist white finish

Bottom view

CeilSense onderaanzicht
Robust spring clips for easy installation
Multiple connection options (AC/USB-C/PoE)
Dutch designed and manufactured

Technical highlights

All specifications in one overview

Dimensions:

Ø 68 × 45 mm

Connectivity:

WiFi 2.4 GHz / Ethernet

RGB Verlichting

16 LED ring

Firmware:

ESPHome (WiFi/Ethernet switch)

Dutch designed • CE certified

Revolutionary motion detection

Advanced mmWave technology & sensor choices

Detect even the slightest movements with advanced 24GHz FMCW mmWave sensors. Unlike traditional PIR sensors, this technology can detect movement through obstacles and even register small movements like breathing. Choose the sensor that best fits your application.

Advantages over traditional PIR sensors

  • Detects movement through obstacles and walls
  • Registers even subtle movements like breathing
  • Not sensitive to temperature changes (like sunlight)
  • Perfect for energy-saving automations that stay active, even when someone sits still
mmWave sensor radar detectie visualisatie
🔍 CeilSense Radar
24.125 GHz mmWave
9m range • ±75° coverage
●
CeilSense

From presence to position tracking

Choose between simple presence detection that registers whether someone is in the room, or advanced position tracking that shows exactly where someone is located. All sensors fit in the same CeilSense housing.

STANDARD

HLK-LD2412

Wide presence detection (±75°) that only detects if someone is in the room (yes/no). Ideal for light switches and general automation.

Wide coverage: ±75° detection angle
Simple: presence yes/no signal
Range up to 9 meters
Included with every CeilSense
COMING SOON

LD2450 Upgrade

Advanced position tracking that knows exactly where people are located in the room. Narrow, focused beam for zone-specific automation and unique possibilities.

Narrow beam: targeted zone detection
Positional data: X,Y coordinates
Multi-zone automation possible
Upgrade price: Coming soon
IN DEVELOPMENT

Other mmWave Variants

We are developing software support for 3 additional mmWave sensor types that can be directly installed in the existing CeilSense hardware.

Different detection patterns per sensor type
Plug & play sensor changes
Same housing, better performance

Flexible installation

Universal built-in for every situation

CeilSense offers three flexible power options:

  • 110-240V mains voltage - ideal when replacing an existing spot
  • USB-C (5V, minimum 1A) - for flexible power
  • Power over Ethernet (PoE) - for combined data and power

Ethernet without PoE? No problem! You can simply use Ethernet for the data connection and power the CeilSense via USB-C or mains voltage.

Note: When using UTP cable, add the length of the UTP connector (~15mm) to the required installation depth.

Installatie illustratie
68mm opening
Spring clips
Elegant finish

Three flexible power options

110-240V AC

Ideal when replacing an existing spot. Dutch designed circuit with galvanic isolation for optimal safety.

USB-C

Flexible 5V (minimum 1A) power via a standard USB-C connection for easy installation.

Power over Ethernet

Combined power and data via one network cable for a stable and neat installation.

Seamless integration

Ready for Home Assistant out of the box

CeilSense connects directly to your Home Assistant installation via WiFi or wired Ethernet+PoE. Thanks to ESPHome support, all sensors and functions are automatically detected, allowing you to build dashboards and set up automations within minutes without complex configuration.

Plug & Play configuration

Automatic detection of all sensors and functions via ESPHome

Real-time data

Live monitoring of motion, CO₂, temperature and humidity

Advanced automation

Create complex scenes and triggers based on multiple sensors

Home Assistant integratie dashboard
Live Data
Home Assistant

CeilSense has taken my smart home to the next level. The combination of invisible installation with comprehensive sensor data gives me complete control over every space, and the low energy consumption makes it a sustainable choice.

Convinced of the quality? Order now!

Transform your smart home with CeilSense. Advanced sensor technology, elegant integration and Dutch quality - everything you need for the ultimate home automation.

Frequently Asked Questions

What exactly is CeilSense and where can I install it?

CeilSense is an all-in-one built-in smart sensor that fits perfectly in a ceiling or wall. For ceiling mounting, a hole of 68mm diameter and at least 45mm installation depth is required - exactly the size of a standard GU10 spot opening. The visible outer ring has a diameter of 82mm and provides a neat finish. In existing situations, you can simply remove a spot and install CeilSense in its place. Have a concrete ceiling? Then you can also place the sensor in a junction box. For wall mounting, CeilSense can be installed in a standard junction box in place of existing switch gear. The ideal height for wall mounting is 1 to 1.5 meters. Due to the elegant design, the sensor is barely noticeable in your interior while still collecting extensive data about your living environment.

Which power options does CeilSense support?

CeilSense offers three flexible power options: 110-240 VAC mains voltage, USB-C, or Power over Ethernet (PoE). Important update: all connections (USB-C and Ethernet) are now located on the top of CeilSense instead of on the side. This makes installation easier and prevents problems with long ethernet cables through ceiling holes. When using UTP, you need to add the length of the UTP connector (about 15mm) to the required installation depth. This makes it possible to choose the connection that best suits your situation, whether you're replacing an existing spot (mains voltage), want to use USB power, or prefer a stable network cable with PoE for both power and data.

How does CeilSense motion detection work?

CeilSense uses advanced HLK-LD2412 mmWave technology that transmits and receives radio waves. This system can detect even the smallest movements, such as breathing, and works through obstacles. Unlike traditional PIR sensors, which only detect large movements, CeilSense can detect presence even when someone is sitting still, which is ideal for energy-saving automations in your smart home.

Which parameters does the SCD41 module in CeilSense measure?

The built-in SCD41 module in CeilSense measures three crucial environmental parameters: CO₂ concentration (400-40,000 ppm), relative humidity (0-100% RH) and temperature (-10°C to +60°C). The BH1750 light sensor also measures light intensity (0-65,535 lux). These sensors give you a complete picture of your indoor climate for optimal living conditions.

What is the detection range of CeilSense?

The HLK-LD2412 mmWave sensor in CeilSense has a range of 9 meters with a detection angle of ±75°. This means the sensor can cover a wide area from a central position. The sensor detects movement and presence through obstacles and can even perceive small movements like breathing. For optimal coverage, place CeilSense centrally in the room, preferably in the ceiling.

In which rooms can I best use CeilSense?

CeilSense is ideal for living rooms, bedrooms, offices, meeting rooms and other indoor spaces where you want environmental monitoring and presence detection. Due to the IP20 classification, it is suitable for dry indoor spaces. Avoid installation in very humid rooms like bathrooms or directly above cooktops where a lot of steam is released. For best performance, choose a central position with a clear view of the room.

Does CeilSense only work with Home Assistant?

CeilSense is primarily designed for Home Assistant via ESPHome firmware, which provides the best integration and functionality. Technically, the sensor can also work with other systems that support ESPHome, but Home Assistant offers the most complete experience with automatic detection, dashboards and advanced automations. For other platforms, custom configuration would be required.

Can I integrate CeilSense with my Home Assistant system?

Yes, CeilSense is fully optimized for Home Assistant integration via ESPHome. The sensor is automatically detected and all measurement data and functions are immediately available in your dashboard. You can use the data for automations, graphs and notifications without requiring complex configuration.

How can I use and control the RGB LEDs of CeilSense?

CeilSense contains 16 individually addressable WS2812 RGB LEDs that you can control via Home Assistant. You can use them as mood lighting, status indicator (for example red for poor air quality, green for good), circadian lighting, or as a subtle night light. The LEDs are fully programmable and can respond to sensor data or other triggers in your smart home system.

Does the built-in installation affect temperature measurement?

Yes, due to the built-in installation in ceiling or wall, the temperature measurement can be slightly influenced by heat from surrounding materials and electronics. The SCD41 sensor remains accurate for CO₂ and humidity. For the most accurate temperature measurements, we recommend combining CeilSense with a separate temperature sensor in the room, or using the temperature data for relative measurements and trends instead of absolute values.

What does the BMP388 barometric pressure sensor do in CeilSense?

CeilSense has a standard built-in BMP388 barometric pressure sensor that plays a crucial role in improving CO₂ measurements. This sensor measures atmospheric pressure and helps calibrate the SCD41 CO₂ sensor for more accurate results. CO₂ sensors are sensitive to air pressure changes, and by measuring the current barometric pressure, the SCD41 can compensate its measurements for these variations. This results in more stable and reliable CO₂ values, especially during weather changes or seasonal air pressure fluctuations. The automatic pressure compensation ensures you always get accurate CO₂ measurements without manual calibration.

What is the difference between the standard mmWave (HLK-LD2412) and the optional LD2450?

The standard built-in HLK-LD2412 mmWave sensor offers excellent presence detection with ±75° coverage and 9 meter range. The optional LD2450 mmWave sensor offers advanced position tracking and can detect multiple people, but is still in development. Both sensors detect even small movements like breathing and are ideal for accurate presence detection.

Can multiple CeilSense sensors work together in one home?

Absolutely! You can install multiple CeilSense sensors throughout your home. They all communicate with your Home Assistant system and can collectively provide a detailed picture of the climate and occupancy in different rooms. This enables advanced scenarios such as room-specific lighting, heating and ventilation based on presence and environmental conditions.

Are there future plans for CeilSense?

Yes, CeilSense is designed with future-proofing in mind. We are working on expanding the mmWave sensors, including the LD2450 for advanced position tracking and future variants for even more functionalities. Software updates are regularly released via OTA (Over The Air) to add new features and improve performance. The modular design makes it possible to integrate new sensor technologies as they become available.

What are the complete dimensions of CeilSense?

CeilSense has installation dimensions of 68mm diameter and 45mm height, perfect for standard GU10 spot holes. The visible outer ring has a diameter of 82mm and provides a neat finish that completely covers the edges of the installation hole. For the total required installation depth, you need to account for the connections on top: WiFi only 45mm, USB-C about 55mm total, and for UTP use about 60mm total due to the length of the UTP connector.

Have the connections been moved to the top?

Yes, this is an important update! Based on user feedback, we have moved the USB-C and Ethernet connections from the side to the top of CeilSense. This offers many advantages: easier installation especially with longer ethernet cables, no more problems with cables with large connectors through ceiling holes, enables surface mounting, and provides neater cable routing. When using UTP, you do need to add the length of the UTP connector (about 15mm) to the required installation depth of 45mm. All pre-order customers are being informed about this.

How much installation depth do I need for CeilSense?

The total height of CeilSense remains 45mm, but the required installation depth depends on your connection: WiFi use: 45mm (just the CeilSense itself) USB-C use: 45mm + ~10mm for USB-C connector = ~55mm total Ethernet/UTP use: 45mm + ~15mm for UTP connector = ~60mm total For installation in a ceiling, ensure at least 60mm of space to be able to use all connection options.

What are the complete dimensions of CeilSense?

Complete dimensions overview: Installation size: Ø 68mm (fits in standard GU10 spot hole) Height/depth: 45mm (CeilSense itself) Visible outer ring: Ø 82mm (the part you see in your ceiling) Required installation depth (including connections): - WiFi use: 45mm - USB-C use: ~55mm - Ethernet/UTP use: ~60mm Note: The 82mm outer ring provides a neat finish and completely covers the edges of the 68mm installation hole.

What exactly does CeilSense measure?

CeilSense measures various aspects of your living environment: Motion detection: - mmWave radar (HLK-LD2412) detects motion up to 9 meters - ±75° detection angle - Detects even breathing and small movements - Works through obstacles (no PIR limitations) Environmental sensors (Complete version): - CO₂ concentration (SCD41 sensor, 400-40,000 ppm) - Temperature (-10°C to +60°C, ±0.5°C accuracy) - Humidity (0-100% RH, ±6% accuracy) Light & Lighting: - Light sensor (0-65,535 lux) for automatic brightness adjustment - 16 individually addressable RGB LEDs for mood lighting and status indication

How do I integrate CeilSense with Home Assistant?

CeilSense integrates seamlessly with Home Assistant via ESPHome: Connection options: - WiFi 2.4 GHz (WPA/WPA2 security) - Ethernet with optional PoE power - Switch between WiFi and Ethernet firmware at any time Automatic detection: All sensors and functions are automatically detected by Home Assistant Real-time data: Live monitoring of motion, CO₂, temperature, humidity and light intensity Advanced automation: Create complex scenes based on multiple sensor values

What installation tips are there for CeilSense?

For the best CeilSense installation: Choosing location: - Central in the room for optimal mmWave coverage - At least 0.5m from walls for accurate detection - Avoid installation directly above heat sources Installation preparation: - Check 68mm hole size and 60mm installation depth - Ensure stable power supply - Test WiFi signal strength at installation location After installation: - Let sensor stabilize for 24-48 hours for optimal CO₂ measurements - Calibrate motion detection in Home Assistant - Test all sensor functions before setting up automations

Can I use Ethernet without PoE (Power over Ethernet)?

Yes, absolutely! You can simply use the Ethernet connection for the data connection without PoE. In that case, you power the CeilSense via one of the other options: USB-C (5V, minimum 1A) or mains voltage (110-240V). This gives you the benefits of a stable wired network connection without needing a PoE switch. Many users choose this combination: Ethernet for reliable data and USB-C for easy power.

Technical Specifications

Dimensions
Ø 68 × 45 mm - fits perfectly in standard GU10 spot holes
Network Connection
- Wi-Fi IEEE 802.11 b/g/n (2.4 GHz), supports WPA/WPA2 security
- Ethernet (RJ45) with Power over Ethernet (PoE) support for stable network connection
mmWave Sensors
Standard: HLK-LD2412 mmWave radar for accurate presence detection (±75° coverage, 9m range)
Optional: LD2450 mmWave sensor for advanced position tracking and multiple person detection
Future variants: In development for extended functionalities
Environmental Sensors
- SCD41 module for CO₂ measurement (400-40,000 ppm)
- Temperature measurement (-10°C to +60°C, ±0.5°C accuracy)
- Humidity (0-100% RH, ±6% accuracy)
- BH1750 light sensor (0-65,535 lux)
RGB Lighting
16 individually addressable WS2812 RGB LEDs for ambient lighting, status indication, circadian lighting and subtle night light. Note: Prolonged LED use may affect temperature measurements due to heat generation.
Power Options
- 110-240 VAC mains voltage via high-quality, CE-certified power supply with galvanic isolation
- USB-C port for power supply (5V, minimum 1A)
- Power over Ethernet (PoE) for combined power and data
Installation
- Requires a 68mm diameter hole and minimum 45mm installation depth in ceiling or wall
- Fits perfectly in existing GU10, MR16 or other spot holes
- Easy mounting with spring clips that automatically expand
- Suitable for both round and square junction boxes
- Ideal mounting height: ceiling or wall at 1-1.5m height
Operational Classification
IP20 (suitable for indoor use)
Software
Fully integrated with Home Assistant via ESPHome firmware, including support for OTA (Over The Air) firmware updates
Detection Range
- HLK-LD2412: 9 meter range with ±75° detection angle, detects even small movements like breathing
- LD2450 (optional): 9 meter range with ±75° detection angle, with advanced position tracking
Certification
European designed and manufactured • CE certified for safety and quality
Expandability
Modular design for future-proofing with planned support for additional sensors and functionalities
CeilSense