We gave out a custom eInk + WiFi device to each attendee of Goatmire Elixir. It ran Nerves of course. It was developed, from electronics to software by the fullest stack developer I know:

Gus Workman of Protolux Electronics. In this talk he shares how he does hardware.
https://video.goatmire.com/v/qwr9e
#elixir #goatmire