CeilSense: Built-in Smart Sensor with mmWave & RGB | SmartHomeShop

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!

NOW AVAILABLE

🔬 Beta Test Basic

Delivery: Mid June 2025

€45,-

(Reduced beta rate)

Limited beta units available

Order now

LAUNCH PRICING

🚀 Launch Edition Basic

Delivery: End July/early August 2025

€55,-

(Intro price - later €60)

Pre-order for launch edition

Product will be launched on June 10. For updates: smarthomeshop.io/discord

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!

NOW AVAILABLE

🔬 Beta Test Complete

Delivery: Mid June 2025

€65,-

(Reduced beta rate)

Limited beta units available

Order now

LAUNCH PRICING

🚀 Launch Edition Complete

Delivery: End July/early August 2025

€75,-

(Intro price - later €80)

Pre-order for launch edition

Product will be launched on June 10. For updates: smarthomeshop.io/discord

🧪

Beta package includes:

• Working CeilSense beta unit

• Beta community access

• Direct contact development team

• €15 discount on final version

Beta version - direct support, no warranty

🚀

Launch package includes:

• CeilSense in official packaging

• Complete manual + accessories

• 2 year warranty + premium support

Launch benefit: €5 discount vs normal price

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.

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.

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

Frequently Asked Questions

What exactly is the CeilSense and where can I install it?

The 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 minimum 45mm installation depth is required - exactly the size of a standard GU10 spot opening. In existing situations, you can simply remove a spot and install the CeilSense in its place. Do you have a concrete ceiling? Then you can also place the sensor in a junction box. For wall mounting, the CeilSense can be installed in a standard junction box in place of existing switch material. The ideal height for wall mounting is 1 to 1.5 meters. Due to its elegant design, the sensor barely stands out in your interior while still collecting extensive data about your living environment.

What power options does the CeilSense support?

The CeilSense offers three flexible power options: 110-240 VAC mains voltage, USB-C, or Power over Ethernet (PoE). This makes it possible to choose the connection that best suits your situation, whether you are 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 the motion detection of the CeilSense work?

The 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 capture large movements, the CeilSense can detect presence even when someone sits still, which is ideal for energy-saving automations in your smart home.

What parameters does the SCD41 module in the CeilSense measure?

The built-in SCD41 module in the 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 the CeilSense?

The HLK-LD2412 mmWave sensor in the 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 the CeilSense centrally in the room, preferably in the ceiling.

In which rooms can I best use the CeilSense?

The 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 stoves where a lot of steam is released. For the best performance, choose a central position with a clear view of the room.

Does the CeilSense only work with Home Assistant?

The 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 the CeilSense with my Home Assistant system?

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

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

The CeilSense contains 16 individually controllable WS2812 RGB LEDs that you can operate via Home Assistant. You can use them as ambient 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, temperature measurement can be slightly affected 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 the CeilSense with a separate temperature sensor in the room, or using the temperature data for relative measurements and trends instead of absolute values.

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

The standard built-in HLK-LD2412 mmWave sensor provides 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 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 the CeilSense?

Yes, the 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.

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.nl

CeilSense

Your All-in-OneBuilt-in Smart Sensor

Choose your CeilSense experience

CeilSense Basic

🔬 Beta Test Basic

🚀 Launch Edition Basic

CeilSense Complete

🔬 Beta Test Complete

🚀 Launch Edition Complete

Beta package includes:

Launch package includes:

Smart home. Smart sensors.

Illuminate and communicate

Versatile applications

Note for prolonged LED use

Compact design

Top view

Bottom view

Technical highlights

Revolutionary motion detection

Advantages over traditional PIR sensors

From presence to position tracking

HLK-LD2412

LD2450 Upgrade

Other mmWave Variants

Flexible installation

Three flexible power options

110-240V AC

USB-C

Power over Ethernet

Seamless integration

Plug & Play configuration

Real-time data

Advanced automation

Convinced of the quality? Order now!