Resumen de Sshh! Magnets send secrets to your phone
One's smartphone has a new way to communicate. It's called Pulse that uses the magnetic field sensor for smartphone's compass app to receive messages coded in the signal from a nearby electromagnet. The transmission rate is slow and it only works over a range of 2 cm. But that can be a plus, say Vassilis Kostakos and colleagues at the University of Oulu in Finland, who built a test electromagnet system that talked to Android phones. By encoding data in a varying magnetic field they have shown they can transmit anything from a web address to a simple music sequence from the magnet to the phone.
