Knowledge Base

The AirGradient Builds Overview

Build your own open-source, open-hardware air quality monitor measuring PM2.5, CO2, temperature and humidity.

We are continuously updating our open hardware / open source air quality monitor kits and, as a result, have different versions of the build instructions. The version you have is written on the PCBs. Please check the table below and then click the link to the build instructions that apply to your kit.

Additionally, you can download all source files for the monitors on this page. All builds are licensed under CC BY-SA 4.0. Please ensure proper attribution.

If you have questions or run into a problem during assembly, the best and fastest way to get help is via our forum.

Firmware Repositories

The firmware for the DIY PRO / ONE and Open Air models is combined and is available on the AirGradient Arduino GitHub. Please open issues there for bugs or feature requests.

The firmware for the Open Air Max model is also available in our openair-max repository. Please open issues there for bugs or feature requests.

AirGradient ONE Indoor Monitor

Version	Image of PCB / Files	Main Improvements / Changes	Link to Instructions	Arduino Sketch Name
I-9PSL Model	{{}} black or blue PCB KiCad files main PCB Gerber file main PCB KiCad files LED bar Gerber files LED bar SGP41 Module SHT40 Module Enclosure STL Clip-On Stand STL	Complete new design. ESP32-C3-Mini, RGB LED bar, hardware watchdog	Build instructions	OneOpenAir.ino

AirGradient Open Air Outdoor Monitor

Version	Image of PCB / Files	Link to Instructions	Arduino Sketch Name
O-1PST Model	{{}} KiCad files SGP41 Module CO2 Module STL Files	Build instructions	OneOpenAir.ino

AirGradient Open Air Max Professional Outdoor Monitor

Version	Image of PCB / Files	Link to Instructions	Firmware Code
O-M-1PPST-CE-S Model	{{}} KiCad file main board KiCad file cellular card SGP41 Module SHT40 Module CO2 Module STL Files	N/A. Only available fully assembled	openair-max repository

Old Designs (No Longer Maintained)

Version	Image of PCB / Files	Main Improvements / Changes	Link to Instructions	Arduino Sketch Name
DIY Basic 4.0	{{}} Gerber files STL Files	Switched to shorter cross-over cable for PM. Made T/RH sensor slot compatible with AG module	Standard version	BASIC.ino
4.2	{{}} black or green PCB Gerber files KiCad files Enclosure STL Clip-On Stand STL	Improved tracing / ground plane, removed D1 shield, changed button connection, switched to cross-over cable for PMS	Standard version / Presoldered version	DiyProIndoorV4_2.ino
DIY Pro 3.7	{{}} black or green PCB Gerber files Enclosure STL Clip-On Stand STL	Push button for configuration, rounded corners	Standard version / Presoldered version	Compatible with DiyProIndoorV3_3.ino (no push button functionality)
DIY Pro 3.3	{{}} black or green PCB Gerber files Enclosure STL Clip-On Stand STL		Standard version / Presoldered version	DiyProIndoorV3_3.ino