Open-source hardware design files for the ProtoCentral Pulse Express pulse-oximetry / heart-rate breakout — pairing the Maxim MAX30102 optical sensor with the Maxim MAX32664D biometric sensor hub.
Unlike our Pulse board, which streams raw PPG for the host to process, Pulse Express runs Maxim's algorithms on the MAX32664D hub itself and returns computed heart rate, SpO₂, and blood-pressure-trend estimates over I²C. That offloads the signal processing from your MCU at the cost of visibility into the raw signal.
| 🛒 Product page | https://protocentral.com/product/pulse-express-pulse-ox-heart-rate-sensor-with-max32664/ |
| 💻 Arduino library | https://github.com/Protocentral/protocentral-pulse-express |
| 📄 Sensor hub datasheet (Analog Devices / Maxim) | https://www.analog.com/media/en/technical-documentation/data-sheets/MAX32664.pdf |
| 📄 Optical sensor datasheet | https://www.analog.com/media/en/technical-documentation/data-sheets/MAX30102.pdf |
- Sensor hub: Maxim MAX32664GTGD+ (MAX32664D variant) with 32.768 kHz crystal
- Optical sensor: Maxim MAX30102 — red (660 nm) + IR (880 nm) LEDs, photodiode, and AFE
- Output: computed heart rate, SpO₂, and blood-pressure trend from the on-hub algorithms
- Interface: I²C, via 2× TXS0102 bidirectional level translators
- Connector: 6-pin 0.1″ header
- Supply: onboard AP2112K-3.3 V and AP2112K-1.8 V LDOs
- Board: 36.0 × 17.5 mm, 2-layer
| Revision | Design files | Notes |
|---|---|---|
| v3 (current) | hardware/ |
KiCad 10 |
| earlier | protocentral-pulse-express/hardware/ |
Eagle; retained in the Arduino library repository so existing links keep working |
| Folder | Contents |
|---|---|
hardware/ |
KiCad project (schematic + PCB layout) and the exported schematic PDF |
This device is intended for research, education, and evaluation use only. It is not a medical diagnostic instrument and is not FDA, CE, or FCC approved for consumer use. The blood-pressure-trend output of the MAX32664D requires per-user calibration and is not a substitute for a validated blood-pressure monitor.
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-pulse-express repository) is licensed under the MIT License.