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Engineer

AUSTRALIA • + Follow Edit Project

0

Tools, APP Software Used etc.

	KiCad 8.0 KiCad
	FreeCad
	Soldering iron (generic)
	Bambu Lab X1-Carbon 3D Printer Bambu Lab

Description

Desktop Indoor Air Quality Sensor

In summary, the Desktop IAQ is a USB-C powered indoor air quality monitor built on an STM32G030 that reads from three sensors (Senseair S8 for CO2, AGS02MA for VOCs, and Renesas RRH62000 for particulate matter + humidity/temp), then displays results on a 36-LED multiplexed array (9 rows × 4 columns — one column per parameter) plus RGB status LEDs.

The LED arrays have 4 LED colours, 3xgreen, 3xorange, 2xred and a single blue LED. The idea behind this LED arrangement was to allow for a simple to understand gauge. If the reading is green you are all good, if its red or blue then it might be worth opening (or maybe closing) a window.

Code

I used the ST Cube IDE, I have uploaded the whole folder

IAQ_Take2.zip

Schematic and Layout

Full KiCad Project with Schematic pdf

IAQ_KiCad_Project_V2.zip

CAD-Custom parts and enclosures

All mechanical files needed, can export step or stl etc from FreeCad

FreeCad_Mechanical.zip

Download Gerbers Download BOM(Bill of materials)

Apr 28,2026

12 views

Desktop Indoor Air Quality Sensor

Quality sensors with fun LED bar graphs for easy indoor air quality evaluation.

12

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Published: Apr 28,2026

Standard PCB

Download Gerber file 0

BOM(Bill of materials)

Centroid file

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Copyright Info

Attribution-NonCommercial-NoDerivs (CC BY-NC-ND) License

Under the Attribution-NonCommercial-NoDerivs (CC BY-NC-ND) License.

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Topic

LED Displays & Matrices

2026 KiCad PCB Design Contest 3D printing LED Display Sensor

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Desktop Indoor Air Quality Sensor In summary, the Desktop IAQ is a USB-C powered indoor air quality monitor built on an STM32G030 that...

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