Calendar Gadget

Can take a calendar link (tested with Google Calendar) and show you the next item on the agenda on an Inky Phat eInk display.

To get it running:

Get fonts

I've used the Artwiz fonts via this repo (https://github.com/whitelynx/artwiz-fonts-wl/releases) and unpacked the .bdf files into firmware/rootfs_overlay/fonts.

Erlang and Elixir

If you have asdf installed, you should be able to go into the firmware dir and go asdf install. Or change the asdf versions to something you like, I bumped to Erlang 24.1 to get some faster reboots.

Set up environment variables

In your terminal or however you link managing env vars, assuming a Raspberry Pi 0, and some made-up wifi credentials:

export MIX_TARGET=rpi0
export MIX_ENV=prod
export SSID="My Fancy Wifi"
export PSK="my-pass-132"

Build firmware

mix deps.get
mix firmware
# Insert SD card
mix firmware.burn
# Put it in your device

Confirm it runs

ping nerves.local

It should respond when it is up.

Looking for errors:

ssh nerves.local
RingLogger.next

You can also check if http://nerves.local is up in your browser. Typically won't work from Chrome on Android which I don't believe does mDNS.

Set up a calendar (currently not in UI)

ssh nerves.local
# Create new calendar
c = CalendarApp.Calendar.add("demo", "https://fancy-calendar-url")
# Pull calendar data, should update all views (web and eInk)
CalendarApp.Calendar.update_calendar(c)