Open Source Indoor Air Quality Monitor HAT for Raspberry Pi
Eagle Arduino
Latest commit b99346b Dec 14, 2016 @dconroy dconroy committed on GitHub Update

PiAQ - Open Source Indoor Air Quality Sensor

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

The board comes in two form factors. One dedicated for the Raspberry Pi - PiAQ

CRT Sensor Board

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 information on the standalone air quality sensor, click here.

CRT Sensor Board