4 layers42 × 155 mm
Nrf moisture sensor
alxgmpr/moisture-sensor
Indoor capacitive soil moisture sensor - nRF54L15 + nPM1300 + FDC1004, BTHome v2 over BLE
62 parts
4 layers42 × 155 mm
Before
alxgmpr/moisture-sensorIndoor capacitive soil moisture sensor - nRF54L15 + nPM1300 + FDC1004, BTHome v2 over BLE
- Size
- 42 × 155 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 65
- Nets
- 58
- Pads
- 192
- Tracks, vias
- 178, 501
- Pours
- 14
- Routed
- Yes
- KiCad
- KiCad 10.99 (file 20260831)
- Created
- 30 Jul 2026
- Updated
- 30 Sep 2026
Overview
Before is an open-source printed circuit board by alxgmpr, from the alxgmpr/moisture-sensor repository on GitHub. It is a 4-layer board of 42 × 155 mm with 65 parts on 58 nets, routed with 178 tracks and 501 vias.
It is built around the FDC1004DGSR, SHT40-AD1F-R2 and 453-00001R, with the NPM2100-QEAA-R7, TPD1E01B04DPYR and TPD1E1B04DPYR among its other parts. Its parts include 11 resistors, 10 capacitors, 10 diodes, 4 ICs and 1 transistor.
Main components
12
FDC1004DGSR
MSOP-10-40℃~+125℃ 1kV 29uA 3V~3.6V 4 750uA Capacitive Touch MSOP-10 Touch Sensors ROHSTexas InstrumentsTouch Sensors
SHT40-AD1F-R2
DFN-4(1.5x1.5)-40℃~+125℃ 0%RH~100%RH 1.08V~3.6V 16bit 400nA Factory calibration、Chemical gas resistance、Built-in heater I2C ±0.2℃ ±1.8%RH DFN-4(1.5x1.5) Temperature and Humidity Sensor ROHSSensirionUncategorised453-00001R
-- HWDG ROHSEzurioUncategorisedNPM2100-QEAA-R7
QFN-16(4x4)Overcurrent Protection、Adjustable current limiting、Output discharge QFN-16(4x4) Power Management - Specialized ROHSNordic SemiconPower Management - Specialized
TPD1E01B04DPYR
X1-SON-2(0.6x1)-40℃~+125℃ 0.18pF 1 10nA 15V 2.5A@8/20us 27W@8/20us 3.6V 6.4V Bidirectional ESD IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 X1-SON-2(0.6x1) ESD and Surge Protection (TVS/ESD) ROHSTexas InstrumentsESD And Surge Protection (TVS/ESD)
TPD1E1B04DPYR
X1-SON-2(0.6x1)-40℃~+125℃ 1 100nA 1pF 3.6V 50W@8/20us 6.3A@8/20us 6.4V 8.5V Bidirectional ESD IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 X1-SON-2(0.6x1) ESD and Surge Protection (TVS/ESD) ROHSTexas InstrumentsESD And Surge Protection (TVS/ESD)
0402B102K500NT
04021nF 50V X7R ±10% 0402 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSGuangdong Fenghua Advanced Tech (FH)Multilayer Ceramic Capacitors MLCC - SMD/SMT
DFE201210U-2R2M=P2
08051.2A 2.2uH 228mΩ 2A ±20% 0805 Power Inductors ROHSMurataPower Inductors0402CG3R9C500NT
04023.9pF 50V C0G 0402 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSGuangdong Fenghua Advanced Tech (FH)Multilayer Ceramic Capacitors MLCC - SMD/SMT
CM8V-T1A-32.768KHZ-7PF-20PPM-TA-QC
SMD2012-2P-40℃~+85℃ 32.768kHz 70kΩ 7pF ±20ppm SMD2012-2P Crystals ROHSMicro CrystalCrystals
CR2032-BS-6
SMDBattery base CR2032 Gold SMD Button And Strip Battery Connector ROHSLian Xin TechnologyButton And Strip Battery Connector
DMG2305UX-13
SOT-23-55℃~+150℃ 1 P-Channel 1.4W 10.2nC@4.5V 20V 40mΩ@4.5V、52mΩ@2.5V 5A 77pF 808pF 85pF 900mV P-Channel SOT-23 MOSFETs ROHSDiodes IncorporatedMOSFETs
README
docs/jlc-fiducial-removal-2026-09-09/README.mdRemove optional copper fiducials
Removed FID1–FID4 from the PCB and their three schematic symbols plus unused cached symbol definition. Retained TH1–TH3 for Economic assembly. Restored the four GND stitching vias previously removed only for fiducial clearance; the via removed for TH1 remains absent. Refilled zones and regenerated the Economic assembly package.
Validation: no unconnected items or schematic parity issues; DRC remains at two previously accepted keepout errors and 38 warnings. ERC has no errors. Four alignment/package tests pass. BOM and CPL contain 38 fitted components. Current package: production/jlc-economic-quote/JLC-Gerbers.zip.
Parts
65| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | TPD1E01B04DPYR | Package_SON:Texas_DPY0002A_0.6x1mm_P0.65mm | D4, D5, D6, D7, D8, D9, D10 |
| 4 | 100 1% | Resistor_SMD:R_0402_1005Metric | R32, R33, R34, R35 |
| 4 | 4.7k 1% | Resistor_SMD:R_0402_1005Metric | R22, R23, R36, R37 |
| 4 | Fiducial | Fiducial:Fiducial_1mm_Mask2mm | FID1, FID2, FID3, FID4 |
| 3 | GND | TestPoint:TestPoint_Pad_D1.0mm | TP5, TP7, TP11 |
| 3 | TPD1E1B04DPYR | Package_SON:Texas_DPY0002A_0.6x1mm_P0.65mm | D1, D2, D3 |
| 3 | ToolingHole_JLC_1.152mm | footprints:ToolingHole_JLC_1.152mm | TH1, TH2, TH3 |
| 2 | 100nF 16V X7R | Capacitor_SMD:C_0402_1005Metric | C27, C28 |
| 2 | 1nF 50V X7R | Capacitor_SMD:C_0402_1005Metric | C22, C24 |
| 2 | 22uF/6.3V X5R | Capacitor_SMD:C_0402_1005Metric | C21, C23 |
| 2 | 5.1k 1% | Resistor_SMD:R_0402_1005Metric | R30, R31 |
| 1 | +3V3 | TestPoint:TestPoint_Pad_D1.0mm | TP4 |
| 1 | +3V3_FDC_SW | TestPoint:TestPoint_Pad_D1.0mm | TP6 |
| 1 | 10uF/25V X5R | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | 1k 1% | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | 1uF 10V X7R | Capacitor_SMD:C_0402_1005Metric | C26 |
| 1 | 2.2uF/6.3V X5R | Capacitor_SMD:C_0402_1005Metric | C25 |
| 1 | 2.2uH 20% DFE201210U-2R2M=P2 | footprints:IND_Murata_DFE201210U | L10 |
| 1 | 3.9pF C0G | Capacitor_SMD:C_0402_1005Metric | C13 |
| 1 | 453-00001R BL54L15 | footprints:Ezurio_BL54L15_453-00001 | U1 |
| 1 | CM8V-T1A 32.768kHz CL=7pF 20ppm | footprints:XTAL_CM8V-T1A_2012 | X1 |
| 1 | CR2032-BS-6 | footprints:BatteryHolder_LianXin_CR2032-BS-6 | BT1 |
| 1 | DMG2305UX-13 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | FDC1004 | Package_SO:MSOP-10_3x3mm_P0.5mm | U3 |
| 1 | MARK1 | TestPoint:TestPoint_Pad_D1.0mm | TP16 |
| 1 | MARK2 | TestPoint:TestPoint_Pad_D1.0mm | TP17 |
| 1 | NRESET | TestPoint:TestPoint_Pad_D1.0mm | TP15 |
| 1 | PMIC_INT | TestPoint:TestPoint_Pad_D1.0mm | TP14 |
| 1 | SCL | TestPoint:TestPoint_Pad_D1.0mm | TP13 |
| 1 | SDA | TestPoint:TestPoint_Pad_D1.0mm | TP12 |
| 1 | SENSE1 | TestPoint:TestPoint_Pad_D1.0mm | TP1 |
| 1 | SENSE2 | TestPoint:TestPoint_Pad_D1.0mm | TP2 |
| 1 | SHLD | TestPoint:TestPoint_Pad_D1.0mm | TP3 |
| 1 | SHT40-AD1F | Sensor_Humidity:Sensirion_DFN-4_1.5x1.5mm_P0.8mm_SHT4x_NoCentralPad | U4 |
| 1 | SWD 10p 1.27mm | Connector:Tag-Connect_TC2050-IDC-NL_2x05_P1.27mm_Vertical | J4 |
| 1 | VBAT | TestPoint:TestPoint_Pad_D1.0mm | TP8 |
| 1 | VBAT_RAW | TestPoint:TestPoint_Pad_D1.0mm | TP9 |
| 1 | VINT | TestPoint:TestPoint_Pad_D1.0mm | TP10 |
| 1 | nPM2100-QEAA | Package_DFN_QFN:QFN-16-1EP_4x4mm_P0.65mm_EP2.7x2.7mm_ThermalVias | U2 |
The 64 most common of 65 parts.
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Questions
How big is the Before PCB?
It measures 42 × 155 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Before use?
65 parts, built around the FDC1004DGSR, SHT40-AD1F-R2, 453-00001R and NPM2100-QEAA-R7. 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 Before KiCad files?
From the alxgmpr/moisture-sensor repository on GitHub, at the commit this page was made from: the board is docs/jlc-fiducial-removal-2026-09-09/before.kicad_pcb and its schematic docs/cost-reduction-2026-09-09/before/nrf-moisture-sensor.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Before design in my own project?
Its repository states no licence, so its author keeps all rights: ask alxgmpr before reusing the design.