Sonar scanner

360° sonar scanners have been done before but the ones I've seen make the whole vehicle rotate - this is not an elegant solution. Can you design a sonar scanner using the ultrasonic sensor that can rotate continuously without requiring that the whole Lego vehicle rotate? The difficulty here is allowing for a continuous rotation without the sensor cable getting twisted. The closest I've seen is this one, but it still requires that the big, heavy brick rotate with the sensor - I think it should be possible to avoid that.

This page shows how a radar-like display can be obtained on the EV3 screen. It was written for the NXT and is very advanced, but can no doubt be adapted for the EV3.

See also HERE, HERE and HERE.