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This $30 DIY E Ink Reader Is a Pocket-Sized Library
(www.hackster.io)
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Give it a shot. The code is a bit piecemeal so feel free to improve upon it. I got a book working with upload and stopped there. Its a "good enough" solution. It goes to the next page and keeps the page when the power is out.
The code could probably need a tuneup. I haven't done C++ in 10+ years other than some tiny linux kernel patches and that was a bit ago.