Bibliography - mpechner/Security-Camera GitHub Wiki
I have looked at many pages on the Pi and I have not captured all the ones I have found useful. I do not mean to rip people off. If you recognize something you wrote and do not see a link here, contact me and I'll happily add the link.
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https://maker.pro/raspberry-pi/tutorial/how-to-interface-a-pir-motion-sensor-with-raspberry-pi-gpio
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https://projects.raspberrypi.org/en/projects/getting-started-with-picamera/4
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https://askubuntu.com/questions/919054/how-do-i-run-a-single-command-at-startup-using-systemd
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https://www.freedesktop.org/software/systemd/man/systemd.service.html