My script downloads a new image from a web resource once per hour.
I want to display that image on a monitor connected to a raspberry pi.
What works:
- downloading an image via cron job every hour
- deleting any previous downloaded images from the downloads folder
- displaying the image from the downloads folder on boot
What doesn't work:
- updating the displayed image with the new one automatically when it changed or every hour
My /etc/profile/ has this line added:
/home/pi/code/display/display-image.sh
Which executes the script on boot.
display-image.sh is just a two-liner:
killall fbi
fbi -noverbose -a /home/pi/code/display/images/*.png
which does work fine.
Now the problem I face is that I need fbi (or fim or feh, I tried them all) to check if the image in the downloads folder has been updated and therefore display the new one.
I see two options:
- a setting within fbi, fim or feh that checks for new files in a folder (which would be the best option, but I haven't found that option and it seems they all cache the file list on start)
- executing a cron job which kills fbi/fim/feh and restarts it
I tried the cron job (via crontab -e):
*/6 * * * * DISPLAY=:0 /home/pi/code/display/display-image.sh
But I must make an error here in some way, as the cron job doesn't succeed displaying the image. The output gives me ioctl VT_GETSTATE: Inappropriate ioctl for device (not a linux console?), but I'm not sure if this is the problem or how to solve that.
How can I update my display with the newly downloaded image?