Comment by windexh8er

There are lots of other eInk devices you can use LVGL with.

ReTerminal and other derivatives from Seeed Studio are two options. Seeed even has a newish color unitfor under $250 [0].

Not trying to diminish all of the thought and work that's gone into OPs project but a lot of this has been available to do in HomeAssistant for quite some time. Glad more people are finally seeing the value in eInk like this. I've been using them for a while in my office and bedroom for simple status as the OP states: only showing certain status depending on state.

The other unit I tinkered with quite a bit of is the Heltec Vision Master E290 [1] which is a 3" eInk devices for under $35. Based on ESP32 and has LoRa.

[0] https://www.seeedstudio.com/reTerminal-E1004-p-6692.html [1] https://heltec.org/project/vision-master-e290/