2 layers60 × 30 mm
Controller
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
11 parts3kApache-2.0
2 layers54 × 32 mm
A 2-layer adapter for the SenseAir Sunrise/Sunlight family: two sockets matching the sensor's 5-pin and 4-pin headers, an HT7333 3.3 V LDO with bulk decoupling for the sensor supply, and a solder jumper (JP1) for sensor…
- Size
- 54 × 32 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 13
- Pads
- 35
- Tracks, vias
- 113, 11
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 1 Sep 2026
- Updated
- 1 Sep 2026
Overview
Sunx is an open-source printed circuit board by Open-Air-Foundation, from the Open-Air-Foundation/pcb-module-sunx repository on GitHub, published under the CC-BY-SA-4.0 licence. It is a 2-layer board of 54 × 32 mm with 11 parts on 13 nets, routed with 113 tracks and 11 vias.
Its parts include 4 capacitors, 3 connectors and 1 IC.
README
README.mdAirGradient SUNX CO₂ Sensor Module — Hardware
KiCad hardware design files for the AirGradient SUNX CO₂ sensor module — a plug-in adapter board that carries a SenseAir Sunrise/Sunlight ("SUNX") NDIR CO₂ sensor in AirGradient air quality monitors, including the Open Air Max.
Overview
A 2-layer adapter for the SenseAir Sunrise/Sunlight family: two sockets matching the sensor's 5-pin and 4-pin headers, an HT7333 3.3 V LDO with bulk decoupling for the sensor supply, and a solder jumper (JP1) for sensor power selection. Power and UART are routed to an 8-pin host connector.
This is the SUNX-only variant of AirGradient's CO₂ sensor adapter family — v2.0 of the original combined design with S8 support removed; the S8-only board and the combined S8 + SUNX board live in their own repositories.
Design structure
A single KiCad project in sunx/: one schematic sheet and a 2-layer board.
Repository structure
sunx/ # KiCad project (schematic + board), production/Key components
| Function | Part | Ref |
|---|---|---|
| Sensor sockets (5-pin + 4-pin) | Pin sockets, 2.54 mm | J1, J2 |
| 3.3 V LDO (sensor supply) | HT7333-3 (SOT-89) | U1 |
| Bulk decoupling | 2× 10 µF, 2× 22 µF | C1–C4 |
| Sensor power select (3-way solder jumper) | — | JP1 |
| Host connector (8-pin) | Molex | con1 |
Toolchain
- KiCad 9 (file format 2025-01). All symbols, footprints, and 3D models come from the KiCad standard libraries — the project opens without any extra library setup.
Fabrication
sunx/production/ holds the released set: Gerber zip (sunx-v2.0.zip; the Gerber filenames inside keep the design's original CO2-sensor-pcb naming), BOM, and pick-and-place positions.
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.
The
v2.1branch carries work in progress (AP2112K-3.3 LDO, 0 Ω power-select links replacing the solder jumper, revised silkscreen and placement). It is untested and unreleased — do not order from it.
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
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 10uf / 25V | Capacitor_SMD:C_0603_1608Metric | C1, C2 |
| 2 | 22uf / 16V | Capacitor_SMD:C_0603_1608Metric | C3, C4 |
| 1 | Conn_01x04_Socket | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | Conn_01x05_Socket | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J1 |
| 1 | Conn_01x08_MountingPin | Connector_Molex:Molex_PicoBlade_53261-0871_1x08-1MP_P1.25mm_Horizontal | con1 |
| 1 | HT7333-3-SOT89 | Package_TO_SOT_SMD:SOT-89-3 | U1 |
| 1 | SolderJumper_3_Open | Jumper:SolderJumper-3_P1.3mm_Bridged12_RoundedPad1.0x1.5mm_NumberLabels | JP1 |
The 9 most common of 11 parts.
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Questions
How big is the Sunx PCB?
It measures 54 × 32 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Sunx use?
11 parts. 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 Sunx KiCad files?
From the Open-Air-Foundation/pcb-module-sunx repository on GitHub, at the commit this page was made from: the board is sunx/sunx.kicad_pcb and its schematic sunx/sunx.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Sunx 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).