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How does X work?
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By ESD Faculty
Sensors
Laser Rangefinders
https://www.tme.eu/en/news/library-articles/page/21956/laser-rangefinders-how-do-they-work-which-one-should-you-choose/
https://www.hackster.io/iliasam/making-a-cheap-laser-rangefinder-for-arduino-4dd849
https://sudonull.com/post/24300-Homemade-Scanning-Laser-Rangefinder
Laser Thermometers (pyrometers)
https://sciencing.com/laser-thermometers-work-4962575.html
Record Players
https://electronics.howstuffworks.com/record-player.htm
Digital Calipers
https://www.wonkeedonkeetools.co.uk/calipers/how-does-a-digital-caliper-work
Ultrasonic Distance Sensors
https://www.arrow.com/en/research-and-events/articles/ultrasonic-sensors-how-they-work-and-how-to-use-them-with-arduino
https://www.maxbotix.com/articles/how-ultrasonic-sensors-work.htm
https://www.youtube.com/watch?v=2ojWO1QNprw
https://www.youtube.com/watch?v=1jGvzNrtF24