ECG · Respiration · PPG · SpO₂ · Temperature — streamed live over USB, Bluetooth LE or Wi-Fi from a single Raspberry Pi HAT-sized board.
HealthyPi 5 pairs high-precision analog front ends — 18-bit ECG and 22-bit PPG converters from Maxim and TI — with a design that is open all the way down.
| Five biosignals, one board | ECG, respiration, PPG, SpO₂ and temperature simultaneously. |
| Lossless by design | The RP2040's two cores split acquisition from everything else — 128 SPS sampling is guaranteed by the architecture, not by tuning. |
| Connect however you like | USB-C, BLE or Wi-Fi to OpenView — or log to the onboard microSD with no computer attached. |
| Genuinely open | CERN-OHL-P v2 hardware, MIT software, OSHWA-certified IN000046. Commercial use permitted. |
| Built to extend | Qwiic/I²C connectors add GSR, EEG, EMG or any other sensor. |
Live in OpenView — ECG, respiration and PPG over BLE, with recording to disk
| Signal | Front end | Notes |
|---|---|---|
| ECG | Maxim MAX30001 | 18-bit, 128 SPS, 3-electrode cable included |
| Respiration | Maxim MAX30001 | Bio-impedance, from the same electrodes |
| PPG / SpO₂ | TI AFE4400 | 22-bit, red + IR; Nellcor-compatible probe included |
| Body temperature | Maxim MAX30205 | Qwiic/I²C skin probe included |
| Anything else | Your sensor | Qwiic connectors — GSR, EEG, EMG, … |
- RP2040 dual-core ARM Cortex-M0+ main MCU, 16 MB flash
- ESP32-C3 RISC-V co-processor for Bluetooth LE and Wi-Fi
- 40-pin Raspberry Pi HAT connector
- 2× USB Type-C — one per MCU
- microSD slot for onboard recording
- Li-Ion battery management with USB charging
- 75.5 × 56 × 17 mm
Board revisions 5.2 through 5.7 are electrically identical — one pin map serves all of them.
1. Get a board — ProtoCentral Store · Mouser · Crowd Supply
2. Install OpenView — Windows, macOS, Linux, Android or iOS.
3. Connect over USB, BLE or Wi-Fi and start streaming. Boards ship pre-flashed.
Then see the documentation for electrode placement, wiring and the streaming data format.
In the kit — board, SpO₂ probe, ECG cable, temperature probe, headers and 20 electrodes
This repository holds the hardware design files. Everything else lives in its own repository:
| Repository | What it is | |
|---|---|---|
| App | protocentral_openview | OpenView — the main GUI. Flutter app for Windows, macOS, Linux, Android and iOS. Downloads |
| Firmware (RP2040) | protocentral_healthypi_5_firmware | Arduino firmware and library — tutorial sketches plus the dual-core NEXT firmware. |
| Firmware (ESP32-C3) | healthybridge-esp32 | HealthyBridge — wireless co-processor: BLE, Wi-Fi, MQTT, web dashboard. |
| Docs | protocentral.com/healthypi | Setup, wiring, streaming formats, troubleshooting. |
Upgrading firmware? The RP2040 and ESP32-C3 firmwares must be updated together — v2 changed the protocol between them.
| Path | Contents |
|---|---|
hardware/ |
Eagle .sch/.brd, BOMs and schematic PDFs — main board revs 5.3–5.7, Pro-Carrier 5.2, ST7796 display add-on 5.2, and enclosure STLs |
docs/images/ |
Images used in this README |
archived/ |
Unmaintained, kept for reference: the old Processing GUI and Python/LSL scripts, both superseded by OpenView |
Hardware and errata → issues here. Firmware → RP2040 or ESP32-C3. App → OpenView. PRs welcome.
Important
HealthyPi 5 is not a medical device. It is not certified for diagnosis, treatment or any clinical use, and must never be relied on for medical decisions — it is for education, research and development only. When connected to a person, power the board only from a battery or a properly isolated supply.
| Licence | |
|---|---|
Hardware (hardware/) |
CERN-OHL-P v2 — permissive; you may build and sell products based on this design |
| Software | MIT |
| Documentation | CC BY-SA 4.0 |
Distributed WITHOUT ANY EXPRESS OR IMPLIED WARRANTY. Full terms in LICENSE.md.
Part of the HealthyPi family — HealthyPi 5 · HealthyPi 6 · HealthyPi Move
Designed and built by ProtoCentral Electronics — open-source biomedical hardware, from sensor to signal.