the system cleverly measures the Doppler shifts created by human movement on regular Wi-Fi signals. That means that the system doesn't require line of sight for gesture detection and, the researchers claim, it could work with off-the-shelf Wi-Fi systems. If using Wi-Fi to detect gestures isn't wild enough, the researches claim that "The average accuracy is 94% with a standard deviation of 4.6% when classifying between our nine gestures."
After all the testing and analysis, one system stood head and shoulders above the others: the ZoneFlex system from Ruckus Wireless. I remember in particular one of the graphs comparing the performance of the various systems under heavy load. The other systems showed a jumble of jagged lines representing drop-outs, while Ruckus sailed smoothly through with none.
Twine is the simplest possible way to get the objects in your life texting, tweeting or emailing. A durable 2.5" square provides WiFi connectivity, internal and external sensors, and two AAA batteries that keep it running for months. A simple web app allows to you quickly set up your Twine with human-friendly rules — no programming needed. And if you're more adventurous, you can connect your own sensors and use HTTP to have Twine send data to your own app.