https://www.allaboutcircuits.com/technical-articles-preview/256757

 

https://www.allaboutcircuits.com/technical-articles-preview/256757

This is a nice introductory article. One overall point that I want to make is that microwave motion sensors and ultrasonic motion sensors are missing from the article. I think that these should be included. Given the primary subject matter indicated by the title, I think inclusion of these two motion sensors takes a higher priority than inclusion of pressure sensors or force sensors. Even flow sensors (movement of liquids) could be included before the latter two sensors. As it looks like the length of the article is near the 1000 word limit, I realize that inclusion of additional motion sensors would require removal of others. While it is certainly only my opinion, I think that it is warranted.