LightInk, a Solar Powered ESP32 Smartwatch

There’s something about the ESP32 family of microcontrollers and timekeeping. We probably see it in clocks as often as we do anything else; we also probably see more clocks with one as the beating heart than any of the many other possible timekeeping options. [Daniel Ansorregui]’s LightInk watch is no different in that regard — but it is very different in one important detail, because like any other smartwatch, you won’t have to worry about battery life.