Your smartwatch can already track your whole body, using sound you can’t hear
EchoMotion turns a stock smartwatch into a full-body tracker, reading ultrasonic echoes off your arms, legs and torso to place 12 joints from your head to your ankles. No extra hardware rides along today. Cornell’s SciFi Lab built the system…
We haven't written up this one. The Gadgeteer has the full story — the link below goes straight to it.