Open Air Sense Pro

What is it?

The Open AIR Sense PRO is a fully open-source, customisable air quality monitor built for developers, makers, and enthusiasts.

Whether you’re tracking indoor air quality, conducting environmental studies, or integrating with smart home systems, the Open AIR Sense PRO delivers professional-grade sensing in a compact, hackable format.

Key Features

• Modular Sensor Support – All high-quality Swiss sensors from Sensirion
  🟣 SPS30 – High-precision particulate matter (PM1.0, PM2.5, PM4.0, PM10)
  🟢 SCD40 – Accurate CO₂, temperature, and humidity measurements
  🔴 SGP41 – VOC and NOx gas index

Connectivity

• 🌐 Wi-Fi & Ethernet – Direct integration with Home Assistant

• 🔗 QWIIC Connector – Expand functionality with other I²C sensors and modules

• 🔌 USB-C Powered – Simply use any standard USB charger.

Open Source & Expandable

• Full schematics, firmware, and 3D models available

• Compatible with Arduino, ESPHome, and Home Assistant

• Open design allows easy enclosure customisation, print and personalise your own housing!

Do’s and Don’ts

✅ Do take it apart and explore
✅ Do design your own housing
✅ Do create custom lighting effects
✅ Do adjust your ventilation system using sensor values

❌ Don’t place in direct sunlight
❌ Don’t place outside
❌ Don’t use in areas with high humidity
❌ Don’t use in windy locations (will affect temperature/RH calibration)
❌ Don’t use in smoking areas (harmful buildup will shorten sensor lifespan)

Important Notes

• The sensor comes pre-programmed for either Wi-Fi or Ethernet.
  To switch, you’ll need to reprogram it with ESPHome.

• Orders of 3 or more units can be customised with two Prusament colors of your choice. Lead time will increase by approx. two weeks if the filament is in stock.
  Please specify your color preferences in the “additional instructions” when ordering.

License

This design is released under the CERN-OHL-S license.
More information can be found: here

Warranty

Covered by a 3-year warranty.

Sensors that have been used in a smoking environment are NOT covered by this warranty. The tar build-up on the sensor will make it fail prematurely!

More information can be found: here

Source Files

Available here