(Archive of: http://www.thing-a-day2.com/2008/02/25/day-25-thing-25-antisocialism/) I went to radio shack about a month ago and bought an utrasonic distance sensor made by parallax called a ping))). I have been feeling cranky and anti social lately so I thought I should make something that didnt want to be bothered. I am considering adding an air horn for people… Read more »