Kindle Weatherstation

This is a serverless implementation of a weatherstation for the Kindle (PW2) that is also optimized for battery runtime (~ a month).

The Kindle fetches weather data from Openweathermap.org every 60 minutes, creates a SVG file based on a template, converts the SVG to PNG, displays the newly generated PNG and goes to sleep (STR/suspend to RAM) for the remaining time.

What's what

• weather2svg.py: Queries weather data and assembles a SVG file based on template
• create-png.sh: Gets data, converts svg file to png and compresses png file
• kindle-weather.sh: Main loop, gets and displays data, suspend to RAM and wakeup
• weather-preprocess.svg: SVG template
• config.xml: KUAL config file
• menu.json: KUAL config file
• sync2kindle.sh: rsyncs all files to Kindle, helps during development/debugging
• wifi.sh: Wifi helper script
• weatherstation.conf: Upstart script

rsvg-convert and pngcrush binaries and libs are included.

Kindle preparation:

• Hack the kindle (doh!) --> Mobileread Forum Thread
• Install KUAL
• Add USBnetworking and python (via MPRI)

Installation:

• Adjust key and location in config.py
• Adjust SSID and passphrase in wifi.sh
• Create directory /mnt/us/extensions/weatherstation
• Copy everything to the newly created directory (or use sync2kindle.sh)

Upstart script

Optionally, you can use a startup script to start the weatherstation automatically when the Kindle comes up.

• $ mntroot rw
• $ cp /mnt/us/extensions/weatherstation/weatherstation.conf /etc/upstart
• $ mntroot ro
• $ start weatherstation

Stopping weatherstation:

• Either press button, quickly login and do a killall kindle-weather.sh (or if you are using the upstart script stop weatherstation).
• Or force reboot kindle by holding powerbutton ~10 seconds

Credits:

• Building on ideas and code from
  • https://mpetroff.net/2012/09/kindle-weather-display/ and
  • https://github.com/nicoh88/kindle-kt3_weatherdisplay_battery-optimized