There really isn't one. Perhaps maybe 10s of minutes? Since eInk displays retain the display once power is removed, they pair nicely with applications that also go to sleep between updates. A good example is a daily weather forecast, which would run daily. Or maybe something that only updates hourly.Regarding the eInk display; what is the general rule of thumb for the interval between updates for these displays?
They're just a little more specialized in general. So having one as your *only* display option may be limiting in what you can do overall. You may want something that can update faster as part of the development or learning process, even if your final intent is something that only updates infrequently.
Probably about the same. Since the libraries for each take care of the lower level details.Are these easier/harder/comparable as far as programming them to display the data outputs?
Yes. Checkout Adafruit IO as one option:Other question regarding the Feather microcontroller; is it possible to get the data output to automatically get uploaded to an online database for data aggregation?
https://learn.adafruit.com/adafruit-esp ... ceive-data