The iPhone can pick up some killer vibrations with it’s accelerometer. In fact, one developer Florian Krautli has come up with a prototype Vibrative Virtual Keyboard for the smartphone.
The Vibrative Virtual Keyboard uses the iPhone’s accelerometer sensor to “measure the amplitude of tiny vibrations that emerge when a person is ‘typing’ on a hard surface.”
“The system, dubbed Vibrative, uses the three-dimensional accelerometer in Apple’s smartphone to measure the characteristics of each tap on the table, such as the strength and frequency of the vibrations it causes, and compares them to “training data” to work out its approximate location.”
Check out the video. This is one of the coolest concept prototypes I’ve seen in a while – even though it’s only 80% accurate. If you’re really interested in a keyboard solution for iPhone, check out ZAGGkeys FLEX.