Inky pHAT is an electronic paper (ePaper / eInk / EPD) display for Raspberry Pi.

Let's do something similar to Pimoroni's Inky pHAT weather example in Elixir and Nerves.

Nerves applications produce images for hardware targets based on the MIX_TARGET environment variable. If MIX_TARGET is unset, mix builds an image that runs on the host (e.g., your laptop). This is useful for executing logic tests, running utilities, and debugging. Other targets are represented by a short name like rpi3 that maps to a Nerves system image for that platform. All of this logic is in the generated mix.exs and may be customized. For more information about targets see:

https://hexdocs.pm/nerves/targets.html#content

To start your Nerves app:

• export MIX_TARGET=my_target or prefix every command with MIX_TARGET=my_target. For example, MIX_TARGET=rpi3
• Install dependencies with mix deps.get
• Create firmware with mix firmware
• Burn to an SD card with mix firmware.burn

• chisel
  • to use bitmap fonts
• inky
  • to drive the Inky eInk displays
  • this example uses my fork because the library does not support latest Inky PHAT device.
• req
  • HTTP client
• nerves_time_zones
  • to use local time
  • Specify your time zone in config.config

• Icons are adopted from https://github.com/pimoroni/inky
• The original icons were PNG, but I converted them into pixels so that I can use them easily in my code.
• I used pixels package as a tool for converting PNG into pixels.

• Weather info is fetched from https://wttr.in/?format=j1

• Fonts are fetched from https://github.com/olikraus/u8g2/tree/master/tools/font/bdf

• Official docs: https://hexdocs.pm/nerves/getting-started.html
• Official website: https://nerves-project.org/
• Forum: https://elixirforum.com/c/nerves-forum
• Discussion Slack elixir-lang #nerves (Invite)
• Source: https://github.com/nerves-project/nerves