Motion sensors have changed pretty significantly in the last 20 years. We even have sensors that detect their own motion! Wait... how does that work?... Audible message: Thanks to Audible for supporting our channel. Get a free audiobook of your choice at http://www.audible.com/techquickie. Twitter: http://twitter.com/linustech Facebook: http://facebook.com/linustech Join our community forum: http://linustechtips.com
