[SOLVED] Thanks to everyone who replied. Because I'm not a python guru, but I have a lot of *old* Unix experience from 10+ years ago, I opted to do it all in a bash script that I invoke 1 minute before the 5-minute weewx interval at 00, 05, 10, etc. This does what I want. There likely are more efficient ways of doing this. Web page is here:
<http://www.ve1dx.net/> - Paul ====================================================== #!/bin/bash # # Extract today's sunrise and sunset # SUNRISE=`grep -A 1 Sunrise /home/weewx/public_html/index.html | cut -f2 -d\> | cut -f1 -d\< | tail -1` SUNSET=`grep -A 1 Sunset /home/weewx/public_html/index.html | cut -f2 -d\> | cut -f1 -d\< | tail -1` NOW=`date +%s` # # See it it's day time. If so, take a picture. If dark, use a black square with next update time # if [ $NOW -ge `date -d"$SUNRISE" +%s` ] && [ $NOW -le `date -d"$SUNSET" +%s` ]; then # Because of cron's granularity being limited to 1 minute, we wait to # start because we want this picture to be very close in time to the weather # readings. This should get it within 2-3 seconds. sleep 52 pix_name=$(date +"%Y-%m-%d_%H-%M-%S").jpg /usr/bin/ffmpeg -f video4linux2 -s 1280X960 -i /dev/video0 -ss 0:0:2 -frames 1 /data2/wx_pix/$pix_name # # Date and time stamp picture and move it to the upload directory # TEXT=`date` convert -font helvetica -fill blue -pointsize 36 -draw "text 15,50 '$TEXT'" /data2/wx_pix/$pix_name /data2/wx_pix/$pix_name cp -f /data2/wx_pix/$pix_name /home/weewx/public_html/wx_pix.jpg else TEXT1="It is dark now. Pictures will" TEXT2="resume at "$SUNRISE convert -font helvetica -fill red -pointsize 36 -draw "text 15,275 '$TEXT1 " /home/pdunphy/blank_square.jpg /home/pdunphy/blank_square_1.jpg convert -font helvetica -fill red -pointsize 36 -draw "text 15,325 '$TEXT2 " /home/pdunphy/blank_square_1.jpg /home/pdunphy/blank_square_2.jpg cp -f /home/pdunphy/blank_square_2.jpg /home/weewx/public_html/wx_pix.jpg fi exit ====================================================== On Saturday, November 26, 2016 at 9:53:24 AM UTC-4, WindnFog wrote: > > I have a USB camera pointed at my backyard. It takes a picture every 5 > minutes, one minute before weewx does it's calculations and uploads (i.e. > picture at 04, weewx at 05 and so on.) It works fine now on a cron job > every 5 minutes, 24/7. > > I want to enhance it to just take pictures during daylight hours. My > thoughts are to put a time check in my .bat file that runs every 5 > minutes. Something like: IF (DAYLIGHT) TAKE_PICTURE ELSE FORGET_IT sort of > thinking. > > Is there a better way (from a Linux bash script, not Python) than parsing > /home/weewx/public_html/index_html to obtain these values? I'm looking for > the simplest solution. I'm hoping I can make DAYLIGHT a boolean that is > something like this: > > DAYLIGHT = ((time > Start civil twilight) AND time < (End civil twilight)) > > I could use Sunrise and Sunset instead if they are easier to obtain. > > I'd like to upload this photo to my weewx web site, and I can now except > well over half of them are taken in the dark. I want to put a .jpg there > that says something like "Next photo update at sunrise" or similar. > > Thoughts? Better ideas? > > - Paul > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
