Overview

White	Black

The UltimateSensor v2 is our most complete modular room sensor for Home Assistant. It combines air quality, dual mmWave presence detection, fast PIR motion triggers, Ethernet/PoE, and built-in microphone + speaker hardware with standard local wake word support for local voice assistant use.

Have UltimateSensor v1? Use the UltimateSensor v1 documentation. v1 and v2 use different hardware and firmware packages.

Looking for the compact model without microphone and speaker? See UltimateSensor Mini v2.

Key Features

Feature	Description
CO2, temperature, humidity	Sensirion SCD41
VOC & NOx	Sensirion SGP41 air quality index
Light intensity	BH1750 lux sensor
Dual mmWave	HLK-LD2412 for sensitive presence + standard HLK-LD2450 for tracking and zones
PIR motion	Panasonic EKMC1603111 for fast first motion triggers
Voice assistant	Built-in microphone, speaker, media player and on-device `Okay Nabu` wake word, for Home Assistant voice or SmartHomeShop Cloud Voice
Particulate Matter	Optional Sensirion SPS30 module
Modular upgrades	Optional LD2460 radar upgrade replacing LD2450, plus click-in SPS30 module
Connectivity	WiFi, Bluetooth, Ethernet and PoE
Power	USB-C or PoE
Integration	ESPHome + Home Assistant

Product Variants

Variant	Included
Without SPS30	All standard v2 sensors, no particulate matter module
With SPS30	All standard v2 sensors + particulate matter measurements

Both variants are available in white or black. If you start without SPS30, you can add the module later and switch to the Complete firmware.

Voice Assistant

UltimateSensor v2 is the voice-focused model in the v2 lineup. It includes:

Built-in microphone
Built-in speaker
Media player entity for TTS, alarms and voice responses
Standard local wake word: Okay Nabu runs on the device itself
SmartHomeShop Cloud Voice with cloud firmware, without Home Assistant

👉 See the Voice Assistant Guide.

Mini v2 Difference

The UltimateSensor Mini v2 shares the same core climate and presence stack, but it is designed to be compact:

No microphone
No speaker
No media player
No PIR sensor
ESP32-C6 hardware

👉 See Hardware Versions for the full comparison.

Documentation

Hardware Versions: UltimateSensor v2 vs Mini v1/v2 notes
Installation Guide: Unboxing, power, WiFi setup, Home Assistant
LD2460 Upgrade: module replacement, orientation, mounting and range configuration
Usage Guide: Monitoring, automations, dashboard ideas
Automatic LED Lighting: Motion light, night light, and CO2 warnings
Voice Assistant: Wake word, TTS and media player setup
Sensor Definitions: All entities explained
Calibration: CO2, temperature, humidity and radar calibration
Network Configuration: WiFi/Ethernet setup and switching
Troubleshooting: Common issues and solutions
Technical Specifications: Detailed specs
FAQ: Frequently asked questions
Firmware: Firmware updates and flashing
Home Assistant Integration: Custom dashboard card
SmartHomeShop App: cloud firmware, remote monitoring and Cloud Voice
Warranty and Support: Warranty info and contact

Local Operation

UltimateSensor v2 works locally with Home Assistant. Sensor data stays on your network. Local wake word support is standard, and with a local Home Assistant voice pipeline, voice processing can run fully locally.

Need Help?

Discord: smarthomeshop.io/discord
Support Portal: support.smarthomeshop.io
GitHub: github.com/smarthomeshop/ultimatesensor