Low-power gesture input with wrist-worn pressure sensors


We demonstrate an always-available, on-body gestural interface. Using an array of pressure sensors worn around the wrist, it can distinguish subtle finger pinch gestures with high accuracy (>80?). We demonstrate that it is a complete system that works wirelessly in real time. The device is simple and light-weight in terms of power consumption and computational overhead. Prototype's sensor power consumption is 89uW, allowing the prototype to last more then a week on a small lithium polymer battery. Also, device is small and non-obtrusive, and can be integrated into a wristwatch or a bracelet. Custom pressure sensors can be printed with off-the-shelf conductive ink-jet technology. We demonstrate that number of gestures can be greatly extended by adding orientation data from an accelerometer. Also, we explore various usage scenarios with the device.