4 layers100 × 75 mm
OpenAirScope
emertcakir/OpenAirScope
Open-source air quality and environmental monitoring node with STM32H743 + ESP32-C3, LoRaWAN, RS485, USB-C, Li-ion charging, and multi-sensor support.
282 parts26MIT
2 layers10 × 12 mm
Sgp41-tvoc sensor module
Open-Air-Foundation/pcb-module-sgp41A compact 2-layer carrier board for the Sensirion SGP41 TVOC/NOₓ sensor. It exposes the sensor's I²C interface on a 4-pin 2.54 mm header, with on-board pull-ups and decoupling — everything else lives on the host monitor.
- Size
- 10 × 12 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 8
- Nets
- 5
- Pads
- 21
- Tracks, vias
- 54, 3
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 24 Aug 2026
- Updated
- 24 Aug 2026
Overview
Sgp41-tvoc sensor module is an open-source printed circuit board by Open-Air-Foundation, from the Open-Air-Foundation/pcb-module-sgp41 repository on GitHub, published under the CC-BY-SA-4.0 licence. It is a 2-layer board of 10 × 12 mm with 8 parts on 5 nets, routed with 54 tracks and 3 vias.
It is built around the SGP41-D-R4. Its parts include 3 resistors, 2 capacitors, 1 IC and 1 connector. It belongs with the sensors and measurement boards of this library.
Main components
1README
README.mdAirGradient SGP41 TVOC Sensor Module — Hardware
KiCad hardware design files for the AirGradient SGP41 TVOC/NOₓ sensor module — a plug-in sensor board used in AirGradient air quality monitors, including the Open Air Max.
Overview
A compact 2-layer carrier board for the Sensirion SGP41 TVOC/NOₓ sensor. It exposes the sensor's I²C interface on a 4-pin 2.54 mm header, with on-board pull-ups and decoupling — everything else lives on the host monitor.
Design structure
A single KiCad project in sgp41-tvoc-sensor-module/: one schematic sheet (sensor, connector, passives) and a 2-layer board. (The design was originally drawn as two separate KiCad 6-era projects — schematic and a board named tvoc-sensor-module — and was unified on import; the archived Gerbers keep the tvoc-sensor-module naming.)
Repository structure
sgp41-tvoc-sensor-module/ # KiCad project (schematic + board), BOM, production/
libraries/ # Bundled symbol/footprint/3D libraries (SGP4X, logo)
graphics/ # Icons and artworkKey components
| Function | Part | Ref |
|---|---|---|
| TVOC/NOₓ sensor | Sensirion SGP41-D-R4 | U1 |
| Host connector (I²C, 4-pin 2.54 mm) | Pin header | J1 |
| I²C pull-ups | 10 kΩ | R2–R3 |
Toolchain
- KiCad (file format 2021-era, KiCad 6). Custom symbol/footprint/3D libraries are bundled in
libraries/and referenced project-relative throughfp-lib-table/sym-lib-table— the project opens without any extra library setup.
Fabrication
sgp41-tvoc-sensor-module/production/ holds the released Gerber set (tvoc-sensor-module-v3.zip); the BOM is in sgp41-tvoc-sensor-module/BOM/.
Versioning & releases
Hardware revisions are tagged on this repository. Per-version release notes and the matching production file set are published on the GitHub Releases page.
License
This is open-source hardware. The design files in this repository are licensed under the Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license — see LICENSE.
You are free to use, modify, and manufacture these designs, including commercially, provided you credit AirGradient and share derivative designs under the same license.
Maintainers
AirGradient hardware team.
Parts
8| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 10K | Resistor_SMD:R_0402_1005Metric | R2, R3 |
| 2 | 1uf | Capacitor_SMD:C_0402_1005Metric | C1, C2 |
| 1 | 4.7R | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Horizontal | J1 |
| 1 | LOGO | Logo:logo | G*** |
| 1 | SGP41-D-R4 | SGP4X:XDCR_SGP41-D-R4 | U1 |
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Questions
How big is the Sgp41-tvoc sensor module PCB?
It measures 10 × 12 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Sgp41-tvoc sensor module use?
8 parts, built around the SGP41-D-R4. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Sgp41-tvoc sensor module KiCad files?
From the Open-Air-Foundation/pcb-module-sgp41 repository on GitHub, at the commit this page was made from: the board is sgp41-tvoc-sensor-module/sgp41-tvoc-sensor-module.kicad_pcb and its schematic sgp41-tvoc-sensor-module/sgp41-tvoc-sensor-module.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Sgp41-tvoc sensor module design in my own project?
Its repository publishes it under the CC-BY-SA-4.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).