UltimateSensor Mini Overview
The UltimateSensor Mini is a compact all-in-one room sensor with built-in voice assistant support. Monitor CO₂, temperature, humidity, light, and VOCs while detecting presence with mmWave radar. The integrated speaker and microphone enable voice commands through Home Assistant.
🌟 Key Features
| Feature | Description |
|---|---|
| CO₂ Monitoring | SCD41 sensor (400-5,000 ppm) |
| Temperature | ±0.5°C accuracy |
| Humidity | 0-100% RH |
| Light Intensity | BH1750 lux sensor |
| VOC & NOx | SGP41 air quality index |
| mmWave Radar | LD2450 — track up to 3 people, 4 zones |
| Voice Assistant | Built-in speaker & microphone |
| Media Player | Play sounds, TTS, alarms |
| RGB LEDs | Front + back LED for status/alerts |
| Connectivity | WiFi only |
| Power | USB-C |
| Integration | ESPHome + Home Assistant |
📦 Product Variants
| Variant | Sensors Included |
|---|---|
| Basic | CO₂, Temp, Humidity, Light, VOC, NOx, mmWave, Voice |
| Complete | All Basic + additional features (beta) |
📚 Documentation
- Installation Guide — Unboxing, power, WiFi setup, Home Assistant
- Usage Guide — Monitoring, automations, dashboard ideas
- Sensor Definitions — All entities explained
- Voice Assistant — Setup wake word and voice commands
- Calibration — CO₂, temperature, humidity calibration
- Troubleshooting — Common issues and solutions
- Technical Specifications — Detailed specs
- FAQ — Frequently asked questions
- Home Assistant Card — Custom dashboard card
- Firmware & Software — Updates and customization
- Warranty and Support — Warranty info and contact
🎤 Voice Assistant
The UltimateSensor Mini has a built-in speaker and microphone for Home Assistant voice commands:
- Wake word detection via Home Assistant
- Text-to-speech for announcements
- Media playback for alarms and sounds
- LED feedback during voice interactions
👉 See the Voice Assistant Guide for setup instructions.
🏠 100% Local Operation
The UltimateSensor Mini works entirely locally with Home Assistant. No cloud account, no subscriptions, no data leaving your network. Voice processing happens in Home Assistant, not in the cloud.
💬 Need Help?
- Discord: smarthomeshop.io/discord — Community support with 7,500+ members
- Contact: smarthomeshop.io/contact — Direct support
- GitHub: github.com/smarthomeshop/ultimatesensor-mini — Source code