LightInk
E-Ink watch that can run solely on solar power
LightInk launched on May 1, 2026 with 9 votes, #1,305 of 20,538 launches that month and more than 90% of that year's launches.
What it does
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.
ESP32 E-Ink watch that can run solely on solar power
To make the experience fit your profile, pick a username and tell us what interests you. This project was created on 04/23/2026 and last updated 4 months ago. All the code and materials is in Github: https://github.com/DarkZeros/LightInk Checkout the features demo video: This project started long time ago in 2019, with the idea to build a solar watch that can use LORA packets to communicate to a receiver at home. Back then i started with a Heltec Wireless stick lite and an external eink display. Then I discovered "Watchy"  https://watchy.sqfmi.com/  and immediately bought one, it didn't have what i wanted (sleek design, LORA, and solar), however i though it was a very good…from hackaday.io
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