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.

We don’t know if [Hanna Yatco] has a good sense of balance or not, but we do know her Arduino does. Her build uses the ubiquitous HC-SR04 SONAR sensor and a servo.

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 ...