Found it. This post has the links that explain how to control a bare eink display:
Quote:
Originally Posted by geekmaster
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As I recently discovered, it is incredibly easy to drive the bare eink displays you can get on ebay for $15 or less (k5 replacement displays) with a simple $3 "ESP" computer (with wifi):
http://essentialscrap.com/eink/waveforms.html
Some "compatible" eink displays have a couple extra control lines (presumably for addressing quadrants in larger displays):
https://spritesmods.com/?art=einkdisplay
These displays are very easy to control with a handful of GPIO pins, but only in saturated black and white. It is greyscale that is complex, requiring "waveforms" (timing tables that vary with mfg batch and with temperature).
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