HomeSecurity OperationsHacking The 22€ BLE SR08 Smart Ring With Built-In Display

Hacking The 22€ BLE SR08 Smart Ring With Built-In Display

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In the latest trend of making everyday objects “smart,” smart rings have emerged as the next frontier with increasingly advanced features. One such ring, the SR08, recently caught the attention of tech enthusiast [Aaron Christophel]. This particular ring, equipped with an OLED display, 1 MB Flash memory, and powered by a Renesas DA14585 chip, has garnered interest from multiple manufacturers due to its versatile capabilities.

The compact size of the SR08 has posed a challenge for reverse-engineering and development. To overcome this hurdle, [Aaron] opted to use the €35 DA14585 development kit from Renesas, which offers a more accessible platform for tinkering with the ring’s functionalities. In order to expand the storage capacity of the dev kit, a 1 MB SPI Flash chip had to be swapped in place of the original 256 kB chip. Detailed instructions, reference PDFs, pinouts, and custom demo firmware can be found on [Aaron]’s GitHub repository, along with a comprehensive video explanation for practical guidance.

Unlike previous attempts that risked damaging the ring during the hacking process, [Aaron] adopted a new approach by utilizing the Renesas Software Update OTA app to flash custom firmware onto the device. Despite encountering a CRC error during the flashing process, this issue was deemed inconsequential and did not hinder the customization efforts. The power consumption of the ring was also analyzed, revealing an idle current draw of approximately 18 µA and a display-active current draw of 3 mA, details that are addressed in the custom firmware for potential experimentation and optimization.

Through [Aaron]’s demonstration and resource-sharing initiatives, enthusiasts and developers are encouraged to explore the untapped potential of these smart rings and innovate new functionalities beyond their conventional use cases. The community-driven approach to enhancing the capabilities of smart devices underscores the endless possibilities for customization and personalization in the realm of wearable technology.

As the era of interconnected devices continues to evolve, the adaptability and flexibility of smart accessories like the SR08 ring serve as a testament to the ingenuity and creativity of tech enthusiasts worldwide. By unlocking the full potential of these innovative gadgets through collaborative efforts and exploration, a new wave of possibilities emerges in the burgeoning field of wearable tech. With each new breakthrough and customization endeavor, the boundaries of what is achievable with smart rings are pushed further, paving the way for a future where everyday objects seamlessly integrate with our digital lives.

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