Finger-Tracking Tech Turns Your Arm Into A Touchpad (gizmag.com)

New submitter Keys of Cars quotes a report from Gizmag: Smartwatches may be handy, but their tiny touchscreens can easily be obscured by your fingers as you're using them on the device. As a result, we've seen various attempts to move the control surface. One of the latest, Carnegie Mellon University's SkinTrack system, moves it onto your hand and lower arm. The strap of the smartwatch features multiple electrodes, which detects a ring that is worn on your "control finger" (on your non smartwatch-wearing arm) that emits a high-frequency electrical signal. When your finger, specifically the ring, approaches and/or touches the arm with the watch, the high-frequency electrical signal is propagated through the skin. It will work even if your skin is covered with clothing! The system is reportedly 99% accurate, and can locate touches with a mean error of 7.6mm. SkinTrack was used to control games, scroll through lists, zoom in and out of maps, draw pictures, and operate an onscreen number pad.

Comments

accuracy

[arth1]

The system is reportedly 99% accurate, and can locate touches with a mean error of 7.6mm

That seems pretty horrible, to be honest.
Your big toe probably has better accuracy than that.