The SpellRing can track the shape of hands, movement, and palm orientation to enable word spelling in American Sign Language ...

While a well-known use of this is sonar, ultrasonic sensors can also be put to use to make a radar-like system. This ultrasonic radar project is from [mircemk] who uses a small ultrasonic distance ...

The new ring may also sport new motion sensors that go with these temperature sensors. The Galaxy Ring launched in July last ...