4 layers99.5 × 72 mm
One Air Max
Open-Air-Foundation/pcb-openair-max-main
Open Air Max is AirGradient's professional outdoor air quality monitor, designed for autonomous, off-grid operation.
242 partsCC-BY-SA-4.0
4 layers44 × 55.1 mm
Ag ce A7671G card
Open-Air-Foundation/pcb-module-ce-card1The CE card adds 4G cellular connectivity (LTE Cat 1) to AirGradient monitors. It can be used in the AirGradient Open Air, the AirGradient ONE, and the Open Air Max.
- Size
- 44 × 55.1 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 106
- Nets
- 151
- Pads
- 417
- Tracks, vias
- 977, 222
- Pours
- 17
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 24 Aug 2026
- Updated
- 24 Aug 2026
Overview
Ag ce A7671G card is an open-source printed circuit board by Open-Air-Foundation, from the Open-Air-Foundation/pcb-module-ce-card repository on GitHub, published under the CC-BY-SA-4.0 licence. It is a 4-layer board of 44 × 55.1 mm with 106 parts on 151 nets, routed with 977 tracks and 222 vias.
It is built around the WK2132-ISSG, TS3A5018PW and TS3A5018RSVR, with the ESD5611N-2/TR, SS8050-G and U.FL-R-SMT-1(80) among its other parts. Its parts include 34 resistors, 33 capacitors, 6 ICs, 4 diodes and 4 transistors.
Main components
12
WK2132-ISSG
SSOP-16-208mil-45℃~+85℃ 1Mbps、1.5Mbps、2Mbps 2.5V~5V 3mA 460uA I2C、SPI、UART SSOP-16-208mil Interface - Specialized ROHSWEIKAIInterface - Specialized
TS3A5018PW
TSSOP-16-40℃~+85℃ 1.65V~3.6V 16pF 2ns 2pC 3.5ns 300MHz 4 4:1 7Ω Bidirectional analog channel TSSOP-16 Analog Switches, Multiplexers ROHSTexas InstrumentsAnalog Switches, Multiplexers
TS3A5018RSVR
UQFN-16(1.8x2.6)-40℃~+85℃ 1.65V~3.6V 16pF 2:1 300MHz 4 7Ω 8ns 9ns UQFN-16(1.8x2.6) Analog Switches, Multiplexers ROHSTexas InstrumentsAnalog Switches, Multiplexers
ESD5611N-2/TR
DFN1006-2L1 11V 25A@8/20us 5.2V 50nA 5V 65pF Bidirectional IEC 61000-4-2、IEC 61000-4-5 TVS DFN1006-2L ESD and Surge Protection (TVS/ESD) ROHSWILLSEMIESD And Surge Protection (TVS/ESD)
SS8050-G
SOT-231 NPN 1.5A 100 100MHz 100nA 25V 300mW 400mV 5V NPN SOT-23 Bipolar (BJT) ROHSComchipBipolar (BJT)
U.FL-R-SMT-1(80)
SMD-40℃~+90℃ 1 1.25mm 2mm 50Ω 6GHz Board Side IPEX Male Pin SMD Coaxial Connectors (RF) ROHSHirose ElectricCoaxial Connectors (RF)
19-219/GHC-YR2T1B5Y/3T
0603-40℃~+85℃ 130° 2.9V 360mcd 518nm 525nm 5mA 95mW Discrete Diode Green Water Clear 0603 LED Indication - Discrete ROHSEverlight ElectronicsLED Indication - Discrete
DSHP-01-TJ-GER
SMD,P=1.27mm1 1.27mm 24V 25mA 3,000 Cycles Black SPST Slide, Recessed SMD,P=1.27mm DIP Switches ROHSXUNPUDIP Switches
ESD5341N
DFN1006-2-55℃~+85℃ 0.05pF 1 10nA 40V 5V Bidirectional ESD IEC 61000-4-2 DFN1006-2 ESD and Surge Protection (TVS/ESD) ROHSKUUESD And Surge Protection (TVS/ESD)
ESDA6V1W5
SOT-323-5-40℃~+125℃ 150W 3V 6.1V 6.1V ESD Four channels Unidirectional SOT-323-5 ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)FC-DA1608HRK-620D
0603-30℃~+85℃ 130° 1mm x 0.6mm square LED 25mA 2V 615nm~630nm 630nm 65mW 80mcd~220mcd Discrete Diode Red 0603 LED Indication - Discrete ROHSFoshan NationStar OptoelectronicsLED Indication - Discrete
GT-USB-7010ASV
SMD-40℃~+85℃ 1 1.68mm 10,000 Cycles 16P 24V 3A 7.35mm Black Female Surface Mount, Right Angle Type-C USB 2.0 SMD USB Connectors ROHSG-SwitchUSB Connectors
README
README.mdAirGradient CE Card (A7671G) — Hardware
KiCad hardware design files for the AirGradient cellular extension (CE) card — the plug-in 4G modem card for AirGradient air quality monitors.
Overview
The CE card adds 4G cellular connectivity (LTE Cat 1) to AirGradient monitors. It can be used in the AirGradient Open Air, the AirGradient ONE, and the Open Air Max. The card is built around the SIMCom A7671G modem and plugs into the monitor's CE-card connector (CE1), exposing the modem to the host over UART. Version 2.2 adds GNSS support and a USB-C logging interface.
Note: the card originally used the SIMCom A7672G; the Gerber filenames inside the archived production zip and the bundled module 3D model keep that era's naming.
This repository contains the complete electronics design: schematics, PCB layout, bundled 3D models, and the production output set.
Design structure
The design is a single 4-layer board drawn across three schematic sheets:
| Sheet | File | Contents |
|---|---|---|
| Root | PCB/ag-ce-A7671G-card/ag-ce-A7671G-card.kicad_sch | Power, host interface, UART bridge, analog switch |
| Modem module | PCB/ag-ce-A7671G-card/a7671g-module.kicad_sch | A7671G modem, level translation, antenna connectors |
| SIM slot | PCB/ag-ce-A7671G-card/SIM-slot.kicad_sch | SIM card slot |
Repository structure
PCB/
└── ag-ce-A7671G-card/ # CE card PCB (schematic, layout, DRC rules, production/)
libraries/ # Shared 3D model libraries
├── 3d/ # STEP models
└── easyeda2kicad/ # easyeda2kicad WRL modelsKey components
| Function | Part | Ref |
|---|---|---|
| Cellular modem (LTE Cat 1, GNSS) | SIMCom A7671G | U4 |
| Buck converter | TPS62A06 | U1 |
| I²C-to-dual-UART bridge | WK2132 | U2 |
| UART level translator | TXU0202 | U3 |
| Analog switch (4-channel) | TS3A5018 | U5 |
| Antenna connectors (U.FL) | cellular / GNSS | JP2–JP3 |
Toolchain
- KiCad 10 (file format 2026-03). Symbols and footprints are embedded in the design files; all 3D models are bundled in
libraries/and 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
PCB/ag-ce-A7671G-card/ag-ce-A7671G-card.kicad_dru.
Fabrication
PCB/ag-ce-A7671G-card/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
106| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | VBUS | MyLibrary:My-TestPoint_THTPad_D1.3mm_Drill0.9mm | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9 |
| 7 | 0.1uF | easyeda2kicad:C0402 | C2, C6, C15, C20, C29, C32, C33 |
| 6 | 4.7K | easyeda2kicad:R0402 | R13, R14, R22, R23, R25, R26 |
| 5 | 22pF_NM | easyeda2kicad:C0402 | C4, C5, C22, C23, C24 |
| 4 | 1pF_NC | easyeda2kicad:C0402 | C18, C19, C30, C31 |
| 4 | 1uF | easyeda2kicad:C0402 | C14, C25, C26, C28 |
| 4 | 22uF | easyeda2kicad:C0402 | C7, C8, C10, C11 |
| 3 | 0 | easyeda2kicad:R0402 | R2, R18, R19 |
| 3 | 10K | easyeda2kicad:R0402 | R5, R34, R39 |
| 3 | 1K | easyeda2kicad:R0402 | R17, R30, R31 |
| 3 | 22 | easyeda2kicad:R0402 | R27, R28, R29 |
| 3 | 5.1K | easyeda2kicad:R0402 | R7, R36, R37 |
| 2 | , | ||
| 2 | 0 | easyeda2kicad:R0603 | R21, R38 |
| 2 | 100K | easyeda2kicad:R0402 | R4, R35 |
| 2 | 100uF | easyeda2kicad:C1206 | C12, C13 |
| 2 | 330uF | easyeda2kicad:CAP-SMD_L7.3-W4.3-R-RD | C1, C9 |
| 2 | 33pF | easyeda2kicad:C0402 | C16, C21 |
| 2 | 47K | easyeda2kicad:R0402 | R15, R16 |
| 2 | 510 | easyeda2kicad:R0402 | R20, R24 |
| 2 | ESD5611N-2/TR | easyeda2kicad:DFN1006-2L-BI-1 | TVS4, TVS5 |
| 2 | MMBT3904_C466624 | easyeda2kicad:SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR | Q3, Q4 |
| 2 | SS8050-G | easyeda2kicad:SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR | Q1, Q2 |
| 2 | U.FL-R-SMT-1(80) | easyeda2kicad:RF-SMD_FRF05002-JSS103M | JP2, JP3 |
| 1 | 0.22uH | easyeda2kicad:IND-SMD_L5.7-W5.2 | L1 |
| 1 | 10pF | easyeda2kicad:C0402 | C17 |
| 1 | 10uF | easyeda2kicad:C0402 | C27 |
| 1 | 19-219/GHC-YR2T1B5Y/3T | easyeda2kicad:LED0603-RD_GREEN | NET1 |
| 1 | 1M | easyeda2kicad:R0402 | R1 |
| 1 | 2.2 | easyeda2kicad:R0402 | R33 |
| 1 | 3.3K | easyeda2kicad:R0402 | R12 |
| 1 | 470pF | easyeda2kicad:C0402 | C3 |
| 1 | 499K | easyeda2kicad:R0603 | R6 |
| 1 | 536K | easyeda2kicad:R0603 | R3 |
| 1 | A7671G | A7672S:A7672S | U4 |
| 1 | DSHP-01-TJ-GER | easyeda2kicad:SW-SMD_L5.4-W2.9-LS5.6 | SW1 |
| 1 | ESD5341N | easyeda2kicad:DFN1006-2L-BI | D2 |
| 1 | ESDA6V1W5 | easyeda2kicad:SC-70-5_L2.1-W1.3-P0.65-LS2.1-BR | D4 |
| 1 | FC-DA1608HRK-620D | easyeda2kicad:LED0603-RD_RED | PWR1 |
| 1 | GT-USB-7010ASV | easyeda2kicad:USB-C-SMD_G-SWITCH_GT-USB-7010ASV | USB1 |
| 1 | HC-1.25-8PWT | easyeda2kicad:CONN-SMD_HC-1.25-8PWT | CN1 |
| 1 | Jumper_3_Open | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1 |
| 1 | LSMGA321616T221NG | easyeda2kicad:L1206 | FB1 |
| 1 | PESD3V3L1BA_C2827682 | easyeda2kicad:SOD-323_L1.7-W1.3-LS2.5-BI | D3 |
| 1 | SE1V8FBN102 | easyeda2kicad:DFN1006-2L-BI | D1 |
| 1 | SMD-5032_2P 14.7456MHZ 20PF 20PPM | easyeda2kicad:OSC-SMD_L5.0-W3.2 | X1 |
| 1 | SMN-305 | easyeda2kicad:SIM-SMD_SMN-305 | Card1 |
| 1 | TPS62A06DRLR | easyeda2kicad:SOT-563-6_L1.6-W1.2-P0.50-LS1.6-TL | U1 |
| 1 | TS3A5018PW | easyeda2kicad:TSSOP-16_L5.0-W4.4-P0.65-LS6.4-BL | U5 |
| 1 | TS3A5018RSVR | easyeda2kicad:UQFN-16_L2.6-W1.8-P0.40-BL | U5 |
| 1 | TXU0202DCUR | easyeda2kicad:VSSOP-8_L2.3-W2.0-P0.50-LS3.1-BR | U3 |
| 1 | WK2132-ISSG | easyeda2kicad:SSOP-16_L7.2-W5.3-P0.65-LS7.8-BL | U2 |
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Questions
How big is the Ag ce A7671G card PCB?
It measures 44 × 55.1 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Ag ce A7671G card use?
106 parts, built around the WK2132-ISSG, TS3A5018PW, TS3A5018RSVR and ESD5611N-2/TR. 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 Ag ce A7671G card KiCad files?
From the Open-Air-Foundation/pcb-module-ce-card repository on GitHub, at the commit this page was made from: the board is PCB/ag-ce-A7671G-card/ag-ce-A7671G-card.kicad_pcb and its schematic PCB/ag-ce-A7671G-card/SIM-slot.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ag ce A7671G card 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).