References
Illustration by Christine Moritz 2018
AshleyK5. (n.d.). "Updated people counter with raspberry pi." instructables.com
https://www.instructables.com/id/Updated-People-Counter-with-Raspberry-Pi/
Eadie, A. (2015). EMC fastpass for makers and hardware startups: Global certifications. First Printing. Courtenay, BC Canada.
Kreutzmann, H. (July 24, 2011). "Debian bug report logs -#635473 cron: @reboot jobs are not run." bugs.debian.org
Kohli, K. (n.d.). "PIR sensor in motion detection & identification system." electronicsmaker.com
Luijten, H. (April 27, 2015). "Testing and playing with PIR sensors (motion sensors)." tweaking4all.com
Monk, S. (May 4, 2015). "Test and configure." Adafruit.com
Murry, T. et al. (August 1, 2012). "Execute script on start-up." stackexchange.com
https://raspberrypi.stackexchange.com/questions/8734/execute-script-on-start-up
O'Hanlon, M. (June 10, 2012). "Raspberry pi - run program at startup." stuffaboutcode.com
http://www.stuffaboutcode.com/2012/06/raspberry-pi-run-program-at-start-up.html
Rahul, S. (September 3, 2014). "[Solved] running cron job at reboot on raspberry pi in debian(wheezy) and raspbian."
rahulmahale.wordpress.com
Raspberry pi foundation. (March 31, 2014). "Getting started with NOOBS." raspberrypi.org
Raspberry pi foundation. (September 7, 2017). "Scheduling tasks with cron." raspberrypi.org
https://www.raspberrypi.org/documentation/linux/usage/cron.md
Zengr. (April 11, 2014). "Wifi drops on raspberry pi." stackexchange.com
https://raspberrypi.stackexchange.com/questions/15142/wifi-drops-on-raspberry-pi