These distance or motion sensors use sound reflected from an object to detect changes in its position. Most designs were based on the sensor developed as the range finder for Polaroid’s cameras. You can...
rogerfrost.com is a compendium of ideas for school teachers to use technology. It shows how IT helps find answers to science questions.
Roger Frost was a copywriter and journalist from 1998 to 2016 and this web includes his articles on how the Internet developed and how science is used at work. Contact him using the social links or add a comment to an article. Use this content freely and link back here if you can.
More
