Getting Started with the Internet of Things
Never mind 20 million Google+ users. Since 2008 there have been more 'things' connected to the internet than there are people on the earth: by 2050 there will be 50 billion connected devices — from cattle with wireless sensors that report when a cow is sick or pregnant, to implanted defibrillators that upload diagnostic information and heart rate patterns, to bridges that record every time a boat sails underneath them.