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Look at CrowPanel, you can get nice e-ink devices made for development, at a reasonable price. I have a small 2.13in esp32 board, I spent some time yesterday making it into a pocket flashcard device for my German courses. The energy consumption is minimal, small form factor, easy to flash via esptool or arduino utils

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Thanks for the tip, I've seen those small e-ink display on sale in Aliexpress, but wasn't sure about their quality. Maybe I'll get one for my next project, I can see many use cases.

I didn’t notice any quality issue. And the crowpanel docs and demo repos make it simple to quickly get results. Though I had troubles getting macOS to establish a serial connection, no problem under Linux and windows

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