I have finally found some time to use my Raspberry Pi as timelapse camera to capture some startrails. I found this useful page showing all the details needed to set the Pi camera to a maximum of 6s exposure. I got the best results by setting the shared video memory to the maximum setting of 256Mb. Otherwise the image numbers would have gaps.
Now, I just need to repeat this next time there is good weather and new moon. Preferably I’m going to do this in a slightly darker spot with less light pollution.
/etc/rc.local to this srcipt (adapted from the above mentioned website)
#!/bin/bash sleep 120 cd /home/pi/starttrails raspistill -bm -tl 0 -v -set -ISO 800 -awb off -awbg 1,1 -t 14400000 -ss 6000000 -o %06d.jpg shutdown -hP now exit
The pictures were assembled with the following lines:
#!/bin/bash # trail.jpg is a copy of the first immage 000000.jpg for f in 0*.jpg do echo $f convert trail.jpg $f -gravity center -compose lighten -composite -format jpg trail.jpg done exit
I have also turned the stills into a short timelapse video:
~/bin/ffmpeg-3.1.4-64bit-static/ffmpeg -r 15 -i %6d.jpg -vcodec libx264 trail.mp4
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