text: As this tale got too lengthy I’ll end it here. The moral of the story for me was that even ten lines of the most prosaic of code can hold a fair number of surprises. All code and test runs can be found at http://github.com/blu/euclid
  
  Posted on September 24, 2019 February 16, 2020 by Stephen Vicinanza - No Comments on HealthyPi v4 Wearable WiFi Vital Signs Monitor Follows Raspberry Pi HAT Form Factor
  ProtoCentral has started a Crowd Supply campaign for the HealthyPi v4, its latest vital signs monitoring dev kit. The HealthyPi v4 is wearable, wireless, and can be mounted on a Raspberry Pi. The units are all open source and stand-alone made for end-users, students as well as researchers and developers.
  The recent increase in health-related tech has fueled ProtoCentral’s desire to bring its HealthyPi v3 up to current usability and development standards. The retail versions of the HealthyPi v4 are made specifically to work in conjunction with the Android OS for ease of use and mobility. Also, the Raspberry Pi HAT form factor is also supported in this version of the device.
  The articles that have touched on health-related issues and topics from our archives, as well as very recently include HEGduino a neurofeedback monitor and the HealthyPi v3
  The units have a microcontroller and wireless connectivity with ESP32 and support’s Adruino IDE and Espressif ESP-IDF. The measurements that the HealthyPi v4 provides are –
  The HealthyPi v4 was designed to increase the ability to monitor vital signs in all types of situations, during exercise, or work, or play. They provide valuable insights into the real-time effects of different activities on the body, but the functionality and diversity open up the doors to a vast expanse of new research possibilities.
  for many types of scenarios where vital sign monitoring is necessary, usually the monitors require proprietary software, and most times there are major differences between the different types of monitoring software. HealthyPi v4 is opensource with software that is easily applied in many situations. The software is fully customizable and can be built to function in almost any type of circumstance, across applications. the results are more reliable, versatile and more effective across data collection spectrums and affordable.
  The use of the HealthyPi v4 in the development of devices that fit into the health and wellness industry, especially wearable devices, is made easier with the unit’s viability in prototyping. If a given prototype works for the designer’s intention then hardware and software functionality can be integrated into the design, with minimal effort.
  The use of Bluetooth Low Energy and its standalone capability the HealthyPi v4 is an excellent choice for those regions where access to monitoring devices is difficult or impossible.
  Microcontroller and wireless connectivity: ESP32, in WROOM32 module, with a Dual-core Xtensa 32-bit CPU, 4 MB of on-board flash, Wi-Fi, and support for BLE
  Wireless interface: Wi-Fi and Access Point (AP) modes, a 2.4 GHz radio with an on-board PCB antenna that is compatible with Bluetooth 4.2 and BLE
  Pulse oximetry front end: TI AFE4400 pulse oximetry front end with integrated LED driver and 22-bit ADC
  The HealthyPi v4 has an onboard power management system that supports a Lithium Polymer Battery (LiPo) to give it a continuously wearable functionality.
  The HealthyPi v4 can be changed from continuous mode, where it is accessing the Raspberry Pi platform, to wearable mode which allows the unit to function as a standalone monitor.
  The HealthyPi v4 connects easily to an Android device, through the mobile app, which connects through BLE. The device will appear on the homepage of the app, where it can be selected. Once selected the heart rate, respiration rate, temperature, and SPO₂.