Open Source Indoor Air Quality Sensor
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Open Source Indoor Air Quality Sensor

An open hardware and software indoor air quality sensor provided by the National Association of REALTORS and CRT Labs.

CRT Sensor Board

CRT Sensor Board OSH Park render

Measurement Points:

  • Temperature (SHT31)
  • Relative Humidity (SHT31)
  • VOC (Volatile Organic Compounds) (IAQ Core)
  • Derived CO2 (IAQ Core)
  • Barometric Pressure (MPL3115A2)
  • Light Intensity (TSL2561)
  • CO Concentration (MiCS-4154)
  • NO2 Concentration (MiCS-4154)
  • Sound Intensity (ADMP401)


  • FSK (RFM69HW 433/915MHz)
  • WiFi (Particle Photon)
  • Cellular (Particle Electron) (Coming soon)
  • LoRa (Coming Soon)


License: Apache License Version 2.0

For the Raspberry Pi HAT, please visit the PiAQ Website and repository

CRT Sensor Board