FAQ
Product and Variants
What is UltimateSensor v2?
UltimateSensor v2 is the full room sensor for Home Assistant with air quality, climate, dual mmWave presence, PIR, microphone, speaker and standard local wake word support.
What is the difference between UltimateSensor v2 and Mini v2?
| Feature | UltimateSensor v2 | UltimateSensor Mini v2 |
|---|---|---|
| Microphone | Yes | No |
| Speaker / media player | Yes | No |
| Voice assistant | Yes, standard local wake word | No |
| PIR sensor | Yes | No |
| ESP platform | ESP32-S3 | ESP32-C6 |
| Current firmware builds | WiFi/Ethernet | WiFi/Ethernet/Thread |
| Standard LD2412 + LD2450 | Yes | Yes |
| Optional LD2460 upgrade | Yes, replaces LD2450 | Yes, replaces LD2450 |
| SCD41 / SGP41 / BH1750 | Yes | Yes |
| Optional SPS30 | Yes | Yes |
| Barometric pressure | No | No |
Choose UltimateSensor v2 if you want voice assistant, speaker, microphone or PIR. Choose Mini v2 if you want the compact ESP32-C6 sensor without voice hardware.
What is the difference between Basic and Complete firmware?
| Name | Webshop Variant | Meaning |
|---|---|---|
| Basic | Without SPS30 | All standard v2 sensors, no particulate matter module |
| Complete | With SPS30 | Standard v2 sensors plus SPS30 particulate matter |
Can I add SPS30 later?
Yes. If you add the SPS30 module later, switch to the matching Complete firmware.
Sensors
Which sensors are included?
UltimateSensor v2 includes:
- SCD41 for CO2, temperature and humidity.
- SGP41 for VOC and NOx index.
- BH1750 for illuminance.
- HLK-LD2412 for sensitive presence and still detection.
- HLK-LD2450 for zones and target tracking on standard hardware.
- Optional HLK-LD2460 upgrade as a physical replacement for LD2450.
- Panasonic PIR for fast first motion.
- Microphone and speaker for voice assistant.
- Optional SPS30 for particulate matter.
Does UltimateSensor v2 have a barometric pressure sensor?
No. UltimateSensor v2 does not include barometric pressure entities.
What is LD2412 used for?
LD2412 is used for reliable occupancy, moving target and still target detection. It is best for knowing whether someone is still in the room.
What is LD2450 used for?
LD2450 is the standard tracking radar. It adds target coordinates, zones and position tracking. Use it for desk, couch, bed or doorway zones.
What is LD2460 used for?
LD2460 is an optional tracking radar upgrade. It physically replaces the LD2450 module and requires the matching *-ld2460.yaml firmware. LD2412 stays installed as the sensitive presence fallback. LD2460 exposes target 1-5 X/Y/Distance/Angle entities and shared Room Designer polygon and exclusion zones, but not the LD2450-specific zone, speed or resolution entities.
What is PIR used for?
PIR is a fast first-motion trigger. It is useful for quickly turning lights on when someone enters. mmWave is better for continued occupancy and still presence.
Can it detect through walls?
Yes, 24 GHz mmWave can detect through thin walls and some materials. Lower LD2412 Maximum Distance Gate and tighten LD2450 zones. With LD2460, reduce the hardware detection sector and tighten the shared Room Designer polygon or exclusion zones.
Voice Assistant
Does UltimateSensor v2 support local wake word?
Yes. UltimateSensor v2 has standard local wake word support. The wake word is Okay Nabu and it runs on the device.
Does voice processing happen locally?
The wake word always runs on the device. The rest depends on your setup. With Home Assistant Voice and local Whisper and Piper, voice processing can be fully local. With SmartHomeShop Cloud Voice, your spoken request is processed in SmartHomeShop Cloud.
Can I play TTS or alerts?
Yes. Use the media player entity for TTS, alarms and voice responses.
Air Quality
How accurate is CO2?
The SCD41 measures 400-5000 ppm and is suitable for ventilation automations. For best results, run manual fresh-air calibration when needed.
What can I do with VOC and NOx?
Use VOC and NOx as trend indexes for air-quality changes from cooking, cleaning products, poor ventilation or outdoor pollution.
What can I do with SPS30?
With SPS30 installed, you can monitor PM2.5 and PM10, trigger air purifier automations or show air-quality alerts.
Connectivity
Does UltimateSensor v2 support Ethernet and PoE?
Yes. UltimateSensor v2 supports WiFi, Ethernet and PoE when using the matching firmware and hardware connection.
Does it require internet?
No. UltimateSensor v2 works locally with Home Assistant through ESPHome.
Setup and Tuning
Why does it always show occupied?
Run LD2412 Dynamic Background Correction with the room empty, lower the maximum distance gate and tighten the active radar zones. With LD2460, also verify mounting height, angle and the hardware detection sector. See Calibration.
Why are my zones wrong?
LD2450 zones use X/Y boundaries in millimeters. Walk through the room while watching target X/Y values, then set zone boundaries around the area you actually want. LD2460 firmware uses its target X/Y/Distance/Angle entities with the shared Room Designer polygon and exclusion zones described in the LD2460 Upgrade Guide.
Where should I place it?
Place it where the front faces the area you want to monitor. For voice assistant, avoid constant noise sources such as TVs, fans and speakers.
Support
Where can I get help?
Use the Support Portal or join the Discord community.