2 layers23 × 27.1 mm
Monarch breakout board rev1
KacperParaniuk/MonARCH-Electrical-Payload
Contains hardware and software development for project MonARCH
24 parts
2 layers32 × 34.7 mm
Brk fdc2214 v2
Protocentral/protocentral_fdc2214_hardwareKiCad hardware design files for the ProtoCentral FDC2214 4-channel capacitance-to-digital converter breakout (CERN-OHL-P v2).
- Size
- 32 × 34.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 38
- Nets
- 22
- Pads
- 112
- Tracks, vias
- 215, 22
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 21 May 2026
- Updated
- 21 May 2026
Overview
Brk fdc2214 v2 is an open-source printed circuit board by Protocentral, from the Protocentral/protocentral_fdc2214_hardware repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 2-layer board of 32 × 34.7 mm with 38 parts on 22 nets, routed with 215 tracks and 22 vias.
It is built around the FDC2214RGHR, AP2112K-3.3 and BSS138DW-7-F-ES. Its parts include 10 capacitors, 5 resistors, 4 connectors, 4 inductors and 3 ICs. It belongs with the interfaces and adapters boards of this library.
Main components
3
FDC2214RGHR
WQFN-16-EP(4x4)-40℃~+125℃ 2.7V~3.6V 28bit 4 I2C Supports reset function WQFN-16-EP(4x4) Capacitive Sensor IC ROHSTexas InstrumentsADCs/DACs - Special Purpose
AP2112K-3.3
SOT253.3V 600mA CMOS Low Dropout Linear Regulator with EnableDiodes IncorporatedUncategorised
BSS138DW-7-F-ES
SOT-363-55℃~+150℃ 1.5Ω@10V、1.6Ω@4.5V 1V 2 N-Channel 2.2pF 25pF 410mA 417mW 60V 650pC@4.5V 9.7pF N-Channel SOT-363 MOSFETs ROHSElecSuperMOSFETs
README
README.mdProtoCentral FDC2214 Breakout — Hardware
Open-source hardware design files for the ProtoCentral FDC2214 4-Channel Capacitance-to-Digital Converter Breakout — a 4-channel, 28-bit capacitive-sensing board based on the Texas Instruments FDC2214.
The FDC2214 measures the resonant frequency of an external LC tank, an EMI-resistant technique that delivers femtofarad-level resolution. This board adds four onboard LC-tank inductors, dual Qwiic connectors, and a simple I²C interface.
Links
| 🛒 Product page | https://protocentral.com/product/protocentral-fdc2214-capacitance-sensor-breakout/ |
| 💻 Arduino library | https://github.com/Protocentral/protocentral_fdc2214_arduino |
| 📄 IC datasheet (TI) | https://www.ti.com/lit/ds/symlink/fdc2214.pdf |
Specifications
- Sensor: Texas Instruments FDC2214 — 4-channel, 28-bit capacitance-to-digital converter
- Measurement: EMI-resistant LC-based, with four onboard inductors (L1–L4); connect electrodes to IN0–IN3
- Sensor frequency: 10 kHz – 10 MHz
- Interface: I²C (up to 400 kHz), selectable address 0x2A / 0x2B
- Connectors: 2× Qwiic / STEMMA QT + 0.1″ headers
- Supply: 3.3 V – 5 V (onboard regulator)
- Board: 32 × 35 mm
Repository layout
| Folder | Contents |
|---|---|
hardware/ | KiCad project (schematic + PCB layout) and the exported schematic PDF |
production/ | Gerbers, drill files, BOM, and pick-and-place / fabrication outputs |
License
The hardware design files in this repository are licensed under the CERN Open Hardware Licence Version 2 – Permissive (CERN-OHL-P v2). See LICENSE.
The accompanying firmware/library (in the separate protocentral_fdc2214_arduino repository) is licensed under the MIT License.
Parts
38| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 10K | Resistor_SMD:R_0402_1005Metric | R5, R8, R9, R12, R13 |
| 4 | 18uH, CMH322522-180KL | Inductor_SMD:L_1210_3225Metric | L1, L2, L3, L4 |
| 4 | 33p | Capacitor_SMD:C_0402_1005Metric | C4, C5, C6, C7 |
| 4 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4 |
| 2 | 100n | Capacitor_SMD:C_0402_1005Metric | C3, C9 |
| 2 | 1u | Capacitor_SMD:C_0402_1005Metric | C1, C8 |
| 2 | LOGO | SparkFun-Aesthetic:qwiic_4mm | G***, G*** |
| 2 | Qwiic_RA | Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J3, J4 |
| 1 | 10n | Capacitor_SMD:C_0402_1005Metric | C10 |
| 1 | 2.2u | Capacitor_SMD:C_0402_1005Metric | C2 |
| 1 | ADDR | Jumper:SolderJumper-3_P1.3mm_Bridged12_RoundedPad1.0x1.5mm | JP1 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | BSS138DW-7-F | Package_TO_SOT_SMD:SOT-363_SC-70-6 | U4 |
| 1 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J1 |
| 1 | Conn_01x08 | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J2 |
| 1 | FDC2214RGHR | kicad_protocentral_footprints:RGH0016A | U2 |
| 1 | KC2520Z | Oscillator:Oscillator_SMD_Kyocera_KC2520Z-4Pin_2.5x2.0mm | Y1 |
| 1 | LOGO | LOGO | G*** |
| 1 | SolderJumper_2_Bridged | Jumper:SolderJumper-2_P1.3mm_Bridged2Bar_RoundedPad1.0x1.5mm | CLK |
The 36 most common of 38 parts.
Questions
How big is the Brk fdc2214 v2 PCB?
It measures 32 × 34.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Brk fdc2214 v2 use?
38 parts, built around the FDC2214RGHR, AP2112K-3.3 and BSS138DW-7-F-ES. 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 Brk fdc2214 v2 KiCad files?
From the Protocentral/protocentral_fdc2214_hardware repository on GitHub, at the commit this page was made from: the board is hardware/brk_fdc2214_v2.kicad_pcb and its schematic hardware/brk_fdc2214_v2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Brk fdc2214 v2 design in my own project?
Its repository publishes it under the CERN-OHL-P-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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