ProtoCentral 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.