LightInk
Open Source
E-Ink watch that can run solely on solar power
An open-source, solar-powered E-Ink smartwatch. By re-implementing SPI in the ESP32's RTC wake stub and using a low-quiescent buck-boost converter, it reduces active boot time to under 1ms, delivering up to 10 months of battery life on a 100mAh charge.
LightInk is a Open Source company. It launched on Product Hunt on May 1, 2026, with 9 upvotes.
LightInk timeline
- E-Ink watch that can run solely on solar power
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