S1-E1 Pro CO₂ Add-on

High-accuracy CO₂ Sensing – Clear Insight When Precision Matters

When air quality needs certainty.

CO₂ Sensor Add-on for S1 Pro Multi Sense

The S1 Pro includes a built-in air quality sensor (Bosch BME688) that estimates CO₂ levels by analyzing changes in the surrounding air. This offers helpful insight into overall air quality trends, but remains an approximation rather than a direct measurement.

For accurate CO₂ monitoring, a dedicated CO₂ sensor is required. This add-on measures carbon dioxide directly, delivering true CO₂ readings with significantly higher accuracy, consistency, and long-term stability.

On the E1 Pro, this dedicated CO₂ sensor is required for any CO₂ measurement.

Ideal for spaces where ventilation, occupancy, and health matter — and where decisions depend on precise, trustworthy data.

Key Features & Benefits

• True CO₂ measurement using NDIR (Non-Dispersive Infrared) technology
• Measurement range up to 40,000 ppm
• High accuracy and long-term stability
• Integrated temperature measurement
• Integrated humidity measurement

Modular Upgrade Path

For applications where absolute accuracy matters, this optional high-precision add-on enables true CO₂ measurements. This modular approach lets you start with meaningful air quality insight immediately (using the built-in BME688) and upgrade when needed for precise CO₂ tracking.

Perfect complement to the S1 Pro Multi Sense's existing features: mmWave presence, VOCs/eCO₂ estimation, temp/humidity, light/UV, and feedback.

Compatibility & Installation

Designed specifically as an add-on for the S1 Pro Multi Sense (and required for CO₂ on the E1 Pro). Simple integration—plug in the module to the designated port on the device PCB for direct, reliable readings in Home Assistant.

All data processed locally—no cloud required. Fully compatible with ESPHome and the official Sensy-One Home Assistant add-on for visualization and automations.