INTRODUCTION

Biosensor Patch with the ability to collect real-time and accurate data for Blood-oxygen, ECG and Respiration Rate.

DESCRIPTION

The iomico team was engaged to enhance the performance of the client's wearable wristwatch, SafeSAT® and WristSAT, capable of measuring oxygen saturation (SpO2) at clinical-grade accuracy. The project aimed to update hardware, firmware, and the mobile app to ensure seamless operation and improved functionality.Display data as SPO2, PR, and Heart cardiogram charts

SOLUTION

The team contributed to the development of an enhanced Wireless Wearable Biosensor with the following features:

Firmware Update:

• Upgraded firmware to STM32F4-based, ensuring compatibility with modern protocols.

• Implemented BLE stack protocol for seamless communication with iOS and Android apps.

• Added Automatic Gain Control to enhance signal quality.

• Minimized power consumption for extended battery life, achieving 72 hours of operation.

• Enabled Over-The-Air (OTA) firmware updates for convenient maintenance.

Hardware Update:

• WristSAT® Project:

  • Integrated Micro HDMI connector for external sensor interface, enhancing versatility.

  • Replaced slide switch with a momentary switch for improved power control.

  • Updated PCB layout for better performance and reliability.

  • Upgraded BLE to version 5.0 for enhanced connectivity.

• SafeSAT® Sentry Project:

  • Replaced rechargeable battery with a coin-cell for improved longevity.

  • Embedded external on-off switch for user convenience.

  • Revised power circuit and charge analysis circuit for optimized performance.

  • Tested uHDMI probe compatibility with AFE4420 for accuracy.

Mobile App Development: Developed iOS and Android apps with user-friendly features:

• Real-time display of vital signs data.

• Alarming system for abnormal readings.

• Customizable measurement schedules.

• Device discovery and connection via Bluetooth.

• OTA firmware updates for seamless maintenance.

• Data storage with historical sharing options via cloud services.

RESPONSIBILITIES

The iomico team's responsibilities included:

• Firmware Updates: Debugging, optimizing, and adding new features to firmware.

• Mobile App Updates: Enhancing app functionality and compatibility.

• Hardware Updates: Designing and implementing hardware improvements.

TECHNICAL DETAILS

Hardware:

• Components: STM32F4, AFE4420, Micro HDMI connector, BLE 5.0, coin-cell battery.

Mobile App:

• Platforms: iOS/Android.

• Framework: Customized for user-friendly interface and seamless integration.

• Cloud: Dropbox, iCloud for historical data storage and sharing.

CONCLUSION

The Wireless Wearable Biosensor project aimed to improve the accuracy and usability of wearable devices for vital signs monitoring. Through collaborative efforts, the iomico team successfully upgraded the hardware, firmware, and mobile application, ensuring a seamless user experience and reliable health data collection.