e-ink chromium waveshare

screenshot.py

import epd7in5
import Image
import ImageDraw
import ImageFont

EPD_WIDTH = 640
EPD_HEIGHT = 384

def main():
    epd = epd7in5.EPD()
    epd.init()

    # For simplicity, the arguments are explicit numerical coordinates
    image = Image.new('1', (EPD_WIDTH, EPD_HEIGHT), 1)    # 1: clear the frame
    draw = ImageDraw.Draw(image)

    image = Image.open('screenshot.png')
    epd.display_frame(epd.get_frame_buffer(image))


if __name__ == '__main__':
    main()

update.sh

# this is lightly edited version of @andrewn's work: https://github.com/andrewn/resin-epaper to work with the waveshare 7.5"

import epd7in5
import Image
import ImageDraw
import ImageFont

EPD_WIDTH = 640
EPD_HEIGHT = 384

def main():
    epd = epd7in5.EPD()
    epd.init()

    # For simplicity, the arguments are explicit numerical coordinates
    image = Image.new('1', (EPD_WIDTH, EPD_HEIGHT), 1)    # 1: clear the frame
    draw = ImageDraw.Draw(image)

    image = Image.open('screenshot.png')
    epd.display_frame(epd.get_frame_buffer(image))


if __name__ == '__main__':
    main()

echo "Running at $(date -R)"

echo "Timezone is $TZ"

# Take a screenshot
chromium-browser --headless --disable-gpu --no-sandbox --hide-scrollbars --screenshot --window-size=640,384 https://www.bbc.co.uk/

# xargs trims surrounding whitespace
nextFileHash=$(sha1sum screenshot.png | xargs)
lastFileHash=$(cat last-file-hash.txt | xargs)

echo "Comparing hashes"
echo $lastFileHash
echo $nextFileHash

if [ "$nextFileHash" == "$lastFileHash" ]; then
  echo "screenshot is the same, exiting"
  exit 0
fi

echo $nextFileHash > last-file-hash.txt

# Rotate screenshot
# Because the output from chromium gets messed up when 
# the display rotates it
##convert screenshot.png -colorspace gray +matte -depth 2 -rotate -90 screenshot.png
convert screenshot.png -colorspace gray +matte -depth 2 screenshot.png

# Draw nice logo
python screenshot.py