Open-source hardware design files for the ProtoCentral ST1VAFE3BX Biopotential AFE + 3-axis Accelerometer Breakout — a single-lead ECG board based on the STMicroelectronics ST1VAFE3BX vital-signs analog front end (vAFE).
The ST1VAFE3BX combines a single-channel biopotential measurement chain with a 3-axis MEMS accelerometer in one tiny LGA package, letting you capture clean ECG while simultaneously tracking motion. This board is configured for single-lead ECG (3.5 mm jack + 3-electrode cable), adds a Qwiic connector for solderless I²C, exposes a selectable I²C / I³C / SPI header, and includes an onboard 1.8 V regulator with bidirectional level translation so it runs from any 2 V – 5 V host.
| 🛒 Product page | https://protocentral.com/product/protocentral-st1vafe3bx-breakout-kit/ |
| 💻 Arduino library | https://github.com/Protocentral/protocentral_st1vafe3bx_arduino |
| 📄 IC datasheet (STMicroelectronics) | https://www.st.com/resource/en/datasheet/st1vafe3bx.pdf |
- AFE: STMicroelectronics ST1VAFE3BX (biopotential + accelerometer)
- Biopotential: single-lead ECG, 16-bit, via 3.5 mm jack and 3-electrode cable
- Motion: 3-axis accelerometer, ±2 / ±4 / ±8 / ±16 g
- Interface: I²C / I³C / SPI, selectable via JP2 / CS
- Connectors: Qwiic (I²C), 3.5 mm ECG jack, 0.1″ 1×7 header
- Supply: 2 V – 5 V host; onboard 1.8 V LDO with level translation
| Folder | Contents |
|---|---|
hardware/ |
KiCad project (schematic + PCB layout) and the exported schematic PDF |
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_st1vafe3bx_arduino repository) is licensed under the MIT License.