ESPHome USB CO₂ Sensor
Real NDIR Carbon Dioxide Monitoring with Built-in Bluetooth Proxy
Monitor your indoor air quality with confidence using our ESPHome USB CO₂ Sensor, powered by the ESP32-C3 and the genuine Sensirion SCD40 NDIR CO₂ sensor. Designed for seamless integration with Home Assistant, this compact USB sensor not only delivers accurate CO₂ measurements but also functions as a Bluetooth Proxy by default, extending the reach of your Bluetooth smart home devices.
Perfect for homes, offices, classrooms, bedrooms, greenhouses, and anywhere indoor air quality matters.
Why Monitor CO₂?
High indoor CO₂ levels can reduce concentration, cause fatigue, and impact overall comfort. Monitoring CO₂ helps you know exactly when it's time to improve ventilation and maintain a healthier indoor environment.
Unlike inexpensive VOC-based "equivalent CO₂" sensors, this device uses a genuine Sensirion SCD40 NDIR CO₂ sensor for true carbon dioxide measurement.
Key Features
✅ ESPHome Pre-installed
Native ESPHome firmware
Ready for Home Assistant
Local control with no cloud dependency
OTA firmware updates
Fully customizable through ESPHome
✅ Built-in Bluetooth Proxy
The ESP32-C3 comes with Bluetooth Proxy enabled by default, allowing the device to extend Bluetooth coverage throughout your Home Assistant network.
Benefits include:
Extend Bluetooth device range
Improve Bluetooth connectivity
Connect BLE sensors in distant rooms
Support BTHome devices
No additional Bluetooth gateway required
One device, two functions—CO₂ monitoring and Bluetooth Proxy.
✅ Genuine Sensirion SCD40 CO₂ Sensor
Built with the original Sensirion SCD40 photoacoustic NDIR sensor for reliable and accurate indoor air quality monitoring.
Real NDIR CO₂ measurement
High accuracy
Excellent long-term stability
Factory calibrated
Fast response time
✅ ESP32-C3 Performance
Powered by the efficient ESP32-C3 wireless MCU.
2.4 GHz Wi-Fi
Bluetooth Low Energy (BLE)
Low power consumption
Reliable wireless connection
OTA firmware upgrade support
✅ Plug & Play USB Design
Simply plug it into any standard 5V USB power source.
Compatible with:
USB wall chargers
Computer USB ports
USB hubs
Phone chargers
Power banks
No additional power adapter required.
✅ Home Assistant Ready
Automatically integrates with Home Assistant via ESPHome.
Ideal for:
CO₂ monitoring
Dashboard visualization
Historical data logging
Automation triggers
Smart ventilation control
Bluetooth Proxy network expansion
Typical Applications
Smart Home
Office
Bedroom
Classroom
Meeting Room
Greenhouse
Studio
Indoor Air Quality Monitoring
Product Specifications
| Item | Specification |
|---|---|
| Firmware | ESPHome |
| MCU | ESP32-C3 |
| CO₂ Sensor | Sensirion SCD40 |
| Measurement Technology | NDIR CO₂ |
| Wireless | 2.4 GHz Wi-Fi + Bluetooth LE |
| Bluetooth Proxy | Enabled by Default |
| Power Supply | 5V USB |
| Firmware Update | OTA Supported |
| Home Assistant | Native ESPHome Integration |
| Cloud Required | No |
Package Includes
1 × ESPHome USB CO₂ Sensor
1 × User Manual
Why Choose Our Sensor?
✔ Genuine Sensirion SCD40 NDIR Sensor
✔ ESPHome Pre-installed
✔ Built-in Bluetooth Proxy
✔ Native Home Assistant Integration
✔ Plug-and-Play USB Design
✔ OTA Firmware Updates
✔ Local Control, No Cloud
✔ Extend Bluetooth Coverage
✔ Compact and Modern Design
Smart Air Quality Monitoring Made Simple
More than just a CO₂ sensor, this device also expands your Home Assistant Bluetooth network. Monitor indoor air quality accurately while extending the range of BLE sensors and smart devices—all from one compact USB-powered device.
