Since Unexpected Maker’s tiny ESP32 project saw the light a few months ago I’ve been a great fan of it. Not only because it’s the makers dream ESP32, packed with a DotStar Neopixel and a very small mini design, but mostly because it beats many other boards out of there regarding low consumption. Optimizing it the best we could and following the authors library helpers we managed to get a 0.08 mA deepsleep. Please check this branch to try it out: 

https://github.com/martinberlin/eink-calendar/tree/cale_tinypico

Please note that we are also offering to print T5S board housings for free if you register in CALE.es

CALE project has been sponsored by makers store digitspace.com