papirus-image-generator

This is a somewhat over-engineered setup to return a bitmap image for use either a 2.0" or 2.7" PaPiRus e-link display attached to a Raspberry Pi. It fetches two sets of temperature and humidity readings from URLs given in config.json, generates a PNG buffer with node-canvas, then generates a bitmap from there with jimp.

The file display.py is run with URL=<URL of running papirus-image-generator> ./display.py on the Pi that has the PaPiRus display attached and will fetch the bitmap file from above and display it. Set up a repeating cron job to run it every minute:

*   *   *   *   *   URL=http://pi:3000 /home/pi/papirus-image-generator/display.py

Options

config.json

Contains two endpoints that papirus-image-generator expects to return the following format:

{
    "temperature": 20.2,
    "humidity": 45.1
}

Query parameters

• size — Defaults to 2.7 if not specified, can be given as 2.0 for the smaller-size display.
• invert — Defaults to black on white if not specified, can be set to true to show white on black.

Credits

The font Pixellium used in this project is licensed as Creative Commons (by-nd) Attribution No Derivatives.