Home Assistant Lovelace Kindle Screensaver

This tool can be used to display a Lovelace view of your Home Assistant instance on a jailbroken Kindle device. It regularly takes a screenshot which can be polled and used as a screensaver image of the online screensaver plugin.

If you're looking for a way to render your own HTML, see my other project hass-kindle-screensaver which renders a React page and can be adapted to your specific needs.

Sample image

Features

This tool regularly takes a screenshot of a specific page of your home assistant setup. It converts it into the PNG grayscale format which Kindles can display.

Using my own Kindle 4 setup guide or the online screensaver extension for any jailbroken Kindle, this image can be regularly polled from your device so you can use it as a weather station, a display for next public transport departures etc.

Usage

You may simple set up the sibbl/hass-lovelace-kindle-screensaver docker container. The container exposes a single port (5000 by default). You can access the image by doing a simple GET request to e.g. http://localhost:5000/ to receive the most recent image.

Home Assistant related stuff:

• HA_BASE_URL=https://your-hass-instance.com:8123
• HA_SCREENSHOT_URL=/lovelace/screensaver?kiosk (I recommend the kiosk mode project)
• HA_ACCESS_TOKEN=eyJ0... (you need to create this token in Home Assistant first)
• LANGUAGE=en (language to use in Home Assistant frontend)
• CRON_JOB=* * * * * (how often to take screenshots, by default every minute)

Kindle related stuff:

• RENDERING_TIMEOUT=10000 (timeout of render process, necessary if your HASS instance might be down, in milliseconds)
• RENDERING_DELAY=0 (how long to wait between navigating to the page and taking the screenshot, in milliseconds)
• RENDERING_SCREEN_HEIGHT=800 (height of your kindle screen resolution, see below)
• RENDERING_SCREEN_WIDTH=600 (width of your kindle screen resolution, see below)
• ROTATION=0 (rotation of image in degrees, i.e. use 90 or 270 to render in landscape)
• SCALING=1 (scaling factor, i.e. 1.5 to zoom in or 0.75 to zoom out)
• GRAYSCALE_DEPTH=8 (grayscale bit depth your kindle supports)

Advanced stuff:

• OUTPUT_PATH=./output.png (destination of rendered image)
• PORT=5000 (port of server, which returns the last image)
• USE_IMAGE_MAGICK=false (use ImageMagick instead of GraphicsMagick)

You may also simply use the docker-compose.yml file inside this repository, configure everything in there and run docker-compose up.