This is the kind of project that makes me want to raid the drawer of old electronics. The power consumption breakdown from hex4def6 is really valuable context too - wifi being the dominant power draw explains why so many of these e-ink dashboard projects end up with a Pi doing the heavy lifting over USB.

I've been thinking about similar setups for kitchen recipe displays. E-ink is perfect for anything you glance at - no backlight burning your eyes at 6am, and the always-on nature means you don't have to wake up a screen. The trade-off of slow refresh is actually a feature when your data only changes every few minutes.