HealthyPi v4 - Unplugged: Wireless, wearable, open source vital signs monitor powered by ESP32

Reliable health monitoring has traditionally required us to tether ourselves to machines that record our vital signs around the clock. However, outside of clinical settings this is rarely practical. We developed HealthyPi v4 in part to address this challenge. Building on its predecessor, HealthyPi v4 is a fully open source standalone vital signs monitor with wireless and wearable capabilities.

HealthyPi v4 measures the following parameters in real time and with high accuracy:

     Electrocardiogram (ECG) data, heart rate and heart rate variability Respiratory      pulse oximetry (SPO₂)      body temperature
     based on impedance pneumograph

HealthyPi v4 sets new standards for mobility, wearability and wireless connectivity. Through continuous, real-time monitoring of physiological data, it not only provides valuable insights into health and fitness indicators, but also opens the door to previously inaccessible areas of research.

Specification

    Microcontroller and Wireless Connectivity: ESP32, WROOM32 module format, with dual-core Xtensa 32-bit CPU, 4 MB onboard flash memory, Wi-Fi, and supports BLE
        Wireless Interface: Wi-Fi and Access Point (AP) modes, with board 2.4 GHz radio with PCB antenna, compatible with Bluetooth 4.2 and BLE
        Firmware Programming: Supports Arduino IDE and Espressif ESP-IDF
    sensors:
        ECG and respiratory front-end: Texas Instruments ADS1292R 24-bit analog front-end with signal-to-noise ratio (SNR) of 107 dB
        Pulse Oximeter Front End: TI AFE4400 Pulse Oximeter Front End with Integrated LED Driver and 22-bit ADC
        Temperature Sensor: Maxim MAX30208 Digital Body Temperature Sensor for Monitoring Skin Temperature
    Form Factor: Raspberry Pi HAT Form Factor (65mm x 56 mm)

Power management

HealthyPi v4 also includes an onboard power management system that works with rechargeable lithium polymer (LiPo) batteries, making it a true wearable development platform. A simple physical switch can be used to switch between continuous mode (used as a Raspberry Pi HAT) and wearable mode, which allows the HealthyPi v4 to operate as a standalone unit.

Ports and interfaces

    40-pin Raspberry Pi HAT Connector: Standard HAT-compatible header for connecting to any Raspberry Pi
    Qwiic Connector (x2): Connects to any Qwiic-compatible board for virtually seamless I²C sensors Modular
    USB-CDC: Use Onboard USB to UART converter for programming and data transfer
    Slide mode switching: Easily transition between wearable mode and HAT mode
    Power switch: Turn the device on and off