Above video shows the finished E-INK gadget, how it works, how you can build one and motivation behind some of the design decisions.
The above video explains the idea and how hardware and firmware works. It's recommended that you watch that first. Hardware and firmware build instructions and source files are available in their respective folders.
Blog page: https://sasakaranovic.com/projects/diy-eink-gadget/
YouTube video: https://youtu.be/i01PoMj23bA
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