4 layers93.5 × 72.5 mm
2 layers52 × 38.1 mm
Alphasense adc
Open-Air-Foundation/pcb-module-alphasense-adcA compact 2-layer board carrying two Texas Instruments ADS1115 16-bit ADCs that read the AlphaSense electrochemical sensors — NO₂ (A43F) and O₃ (A431) — and report to the host monitor over I²C.
- Size
- 52 × 38.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 14
- Nets
- 27
- Pads
- 58
- Tracks, vias
- 145, 39
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 24 Aug 2026
- Updated
- 24 Aug 2026
Overview
Alphasense adc is an open-source printed circuit board by Open-Air-Foundation, from the Open-Air-Foundation/pcb-module-alphasense-adc repository on GitHub, published under the CC-BY-SA-4.0 licence. It is a 2-layer board of 52 × 38.1 mm with 14 parts on 27 nets, routed with 145 tracks and 39 vias.
It is built around the ADS1115IDGSR, AWHW2-10G-0202-T-R and MMZ2012Y152BT000. Its parts include 6 resistors, 2 capacitors, 2 ICs and 2 connectors.
Main components
3
ADS1115IDGSR
VSSOP-10-40℃~+125℃ 16 1LSB 2 2.048V 2V~5.5V 500nA 860Hz 8Hz、16Hz、32Hz、64Hz、128Hz、250Hz、475Hz、860Hz Built-in Built-in I2C Sigma-Delta Support Yes VSSOP-10 Analog to Digital Converters (ADC) ROHSTexas InstrumentsAnalog To Digital Converters (ADC)AWHW2-10G-0202-T-R
插件Wire To Board ConnectorAssmann WSW Components
MMZ2012Y152BT000
0805-55℃~+125℃ 1 1.5kΩ@100MHz 400mΩ 500mA ±25% 0805 Ferrite Beads ROHSTDKFerrite Beads
README
README.mdAirGradient AlphaSense ADC Module — Hardware
KiCad hardware design files for the AirGradient AlphaSense ADC module — the interface board that digitizes the AlphaSense electrochemical gas sensors in the Open Air Max outdoor air quality monitor.
Overview
A compact 2-layer board carrying two Texas Instruments ADS1115 16-bit ADCs that read the AlphaSense electrochemical sensors — NO₂ (A43F) and O₃ (A431) — and report to the host monitor over I²C. The supply is filtered through a ferrite bead for clean analog readings.
Design structure
A single KiCad project in alphasense-adc/: one schematic sheet and a 2-layer board. (The project was originally named "ADS1115 for AlphaSense NO2-O3", published on Bitbucket as alphasense-oa-pcb, and renamed alphasense-adc here; the Gerber filenames inside the archived production zip keep the alphasense-oa-pcb naming.)
Repository structure
alphasense-adc/ # KiCad project (schematic + board), production/
libraries/ # Bundled 3D model librariesKey components
| Function | Part | Ref |
|---|---|---|
| 16-bit I²C ADC | TI ADS1115IDGSR | U1–U2 |
| Supply filter (ferrite bead) | MMZ2012Y152BT000 | FB1 |
| Host connector (1.25 mm, 8-pin) | Molex 53261-0871 | J1, CN1 |
| Sensor header (2×5 IDC, 2.54 mm) | AWHW2-10G | J2 |
Toolchain
- KiCad 9 (file format 2024-12). Symbols and footprints are embedded in the design files; bundled 3D models are referenced project-relative — the project opens without any extra library setup.
- Fabrication Toolkit plugin — generates the Gerber/BOM/CPL production set in JLCPCB-compatible format.
- Active DRC rules are in
alphasense-adc/alphasense-adc.kicad_dru.
Fabrication
alphasense-adc/production/ holds the ready-to-order set: Gerber zip, BOM, designators, and pick-and-place positions (generated with Fabrication Toolkit, LCSC part numbers for assembly at JLCPCB).
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
14| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 1K | SamacSys_Parts:RESC1608X55N | R4, R5, R6, R7 |
| 2 | 10K | SamacSys_Parts:RESC1608X55N | R3, R8 |
| 2 | ADS1115IDGSR | SamacSys_Parts:SOP50P490X110-10N | U1, U2 |
| 2 | CL10B105KP8NNNC | SamacSys_Parts:CAPC1608X90N | C1, C2 |
| 1 | 532610871 | easyeda2kicad:CONN-SMD_532610871 | CN1 |
| 1 | AWHW2-10G-0202-T-R | SamacSys_Parts:AWHW210G0202TR | J2 |
| 1 | LOGO | LOGO | G*** |
| 1 | MMZ2012Y152BT000 | SamacSys_Parts:BEADC2012X105N | FB1 |
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Questions
How big is the Alphasense adc PCB?
It measures 52 × 38.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Alphasense adc use?
14 parts, built around the ADS1115IDGSR, AWHW2-10G-0202-T-R and MMZ2012Y152BT000. 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 Alphasense adc KiCad files?
From the Open-Air-Foundation/pcb-module-alphasense-adc repository on GitHub, at the commit this page was made from: the board is alphasense-adc/alphasense-adc.kicad_pcb and its schematic alphasense-adc/alphasense-adc.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Alphasense adc 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).