Developer Joseph Sperrier restored a Sense sleep tracker, a device that became non-functional after the manufacturer, Hello, shut down in 2017. The project took approximately six weeks, with the AI model Claude assisting in navigating the company's open-source repositories and debugging hardware issues.
The process involved extracting a 128-bit AES key from the device's microcontroller. While the AI helped generate scripts and analyze documentation, the critical hardware fix—adjusting a voltage jumper from 5V to 3.3V—was identified by the developer. The server backend was subsequently rebuilt using Go and Postgres.
The restoration faced a major setback when the developer flashed the wrong firmware version onto a Sleep Pill sensor, rendering it unresponsive. Recovery required specialized hardware, including a SEGGER J-Link programmer and an SWD adapter, to restore the original factory image.
The project highlights the reliance of modern hardware on cloud servers and the challenges of device longevity. While legislative efforts in New York and Massachusetts aim to mandate support disclosures for consumer electronics, many devices remain dependent on community efforts and available source code for continued operation.
