2 layers60 × 40 mm
Canary
offgridevices/offgrid-hardware
Open hardware from OffGrid Devices. One folder per board. CERN-OHL-S.
52 partsCERN-OHL-S-2.0
2 layers42 × 55 mm
Airmon
lordkev/airmonModular Keyestudio ESP32 touchscreen home air-quality monitor: PCB, enclosure, firmware and build documentation
- Size
- 42 × 55 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 25
- Nets
- 9
- Pads
- 65
- Tracks, vias
- 519, 60
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 6 Sep 2026
- Updated
- 6 Sep 2026
Overview
Airmon is an open-source printed circuit board by lordkev, from the lordkev/airmon repository on GitHub. It is a 2-layer board of 42 × 55 mm with 25 parts on 9 nets, routed with 519 tracks and 60 vias.
It is built around the SHT40-AD1B-R2, AP2112K-3.3TRG1 and 1206L100/16V, with the AO3401A and SMF5.0A among its other parts. Its parts include 5 connectors, 4 capacitors, 4 resistors, 2 ICs and 1 diode.
Main components
5
SHT40-AD1B-R2
DFN-4-EP(1.5x1.5)Temperature And Humidity SensorSensirion
AP2112K-3.3TRG1
SOT-25-5-40℃~+85℃@(Ta) 1 250mV@(600mA) 3.3V 50uVrms 55uA 600mA 65dB@(1kHz) 6V Fixed Over Current Protection、Thermal Shutdown、Enable control Positive SOT-25-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
1206L100/16V
1206UncategorisedYTL
AO3401A
SOT-231 P-Channel 14nC@10V 30V 47mΩ@10V、60mΩ@4.5V、85mΩ@2.5V 4A 55pF 645pF 80pF 900mV SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
SMF5.0A
SOD-123FLESD And Surge Protection (TVS/ESD)hongjiacheng
README
hardware/README.mdAirMon carrier — prototype r0.1
Open airmon.kicad_sch and airmon.kicad_pcb in KiCad 10. Local symbols, footprints, and STEP models are included. The carrier is 42 × 55 mm overall, with a ventilated SHT40 tongue and optional PMSA003I mating socket.
Read hardware and ordering before sending files to a manufacturer. Exact display-board connector identification and the supplied PM socket fit remain unresolved physical checks. ERC/DRC results apply to the digital design and do not remove these release gates.
exports/airmon-gerbers.zip: copper, mask, silk, paste, outline, PTH and NPTH drill files.exports/schematic.pdf,assembly-top.pdf,assembly-bottom.pdf: electrical and assembly drawings.exports/footprint-fit-1to1.pdf: print at actual size to compare the supplied PM socket.exports/placement-smt.csv: SMT placement; J1/J2 require through-hole assembly separately.BOM.xlsx,assembly-bom.csv,purchasing-bom.csv: components and full purchasing data.exports/airmon.step: assembled carrier geometry.
J5 pad numbering follows Plantower, not the generic numbering in the Adafruit reference design. It must be checked against the supplied mating socket. Physical module models in enclosure illustrations are simplified envelopes.
Parts
25| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 10k | AirMon:R_0603_1608Metric | R3, R4 |
| 2 | 4.7k | AirMon:R_0603_1608Metric | R1, R2 |
| 2 | M2 mount | AirMon:MountingHole_2.2mm_M2 | H1, H2 |
| 2 | STEMMA QT | AirMon:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J3, J4 |
| 1 | 100nF 10V X7R | AirMon:C_0603_1608Metric | C4 |
| 1 | 10uF 10V X5R | AirMon:C_0603_1608Metric | C3 |
| 1 | 1206L100/16 | AirMon:Fuse_1206_3216Metric | F1 |
| 1 | 4.7uF 10V X5R | AirMon:C_0603_1608Metric | C2 |
| 1 | 47uF 10V X5R | AirMon:C_1210_3225Metric | C1 |
| 1 | 5V POWER | AirMon:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J1 |
| 1 | AO3401A | AirMon:SOT-23 | Q1 |
| 1 | AP2112K-3.3TRG1 | AirMon:SOT-23-5 | U1 |
| 1 | GND | AirMon:TestPoint_Pad_D1.0mm | TP1 |
| 1 | PMSA003I supplied socket | AirMon:PMSA003I_SuppliedSocket | J5 |
| 1 | SCL | AirMon:TestPoint_Pad_D1.0mm | TP5 |
| 1 | SDA | AirMon:TestPoint_Pad_D1.0mm | TP4 |
| 1 | SDA SCL | AirMon:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J2 |
| 1 | SENSOR3V3 | AirMon:TestPoint_Pad_D1.0mm | TP3 |
| 1 | SENSOR5V | AirMon:TestPoint_Pad_D1.0mm | TP2 |
| 1 | SHT40-AD1B-R2 | AirMon:Sensirion_DFN-4_1.5x1.5mm_P0.8mm_SHT4x_NoCentralPad | U2 |
| 1 | SMF5.0A | AirMon:D_SOD-123F | D1 |
Questions
How big is the Airmon PCB?
It measures 42 × 55 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Airmon use?
25 parts, built around the SHT40-AD1B-R2, AP2112K-3.3TRG1, 1206L100/16V and AO3401A. 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 Airmon KiCad files?
From the lordkev/airmon repository on GitHub, at the commit this page was made from: the board is hardware/airmon.kicad_pcb and its schematic hardware/airmon.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Airmon design in my own project?
Its repository states no licence, so its author keeps all rights: ask lordkev before reusing the design.
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