Instructables user DIYHacksAndHowTos put together this simple pressure plate from cardboard and aluminum foil for a haunted house, but we're intrigued by the home automation prospects. You could easily use it to turn lights or appliances on or off when you enter a room, or for anything else you want automated.
via Web News Blogs http://lifehacker.com/this-diy-pressure-plate-turns-on-the-lights-when-you-wa-1443679631
