This ultrasonic radar project is from [mircemk] who uses a small ultrasonic distance sensor attached to a rotating platform. A motor rotates it around a 180-degree field-of-view and an Arduino ...

Octosonar is a hardware and Arduino software library that’ll get you up and running with up to eight sonar sensors in short order. ... Watch the video below for a demo of this very simple setup.

This DIY sonar glove can 'feel' distant objects underwater Japanese Ph.D. candidates built a portable sonar device with a 3D printer, an Arduino and a few sensors sean buckley ...