Another less-known method is to use an array of ultrasonic transducers ... using a cheap after-market parking distance sensor kit and an Arduino. Demo video after the break.

Ultrasonic transducers ... they can be steered via a phased array. [Bitluni] was trying to accurately measure distances but found the large field of view of the sensor was just too imprecise ...

In this case, Arduino distance sensors use sound to work out how distant objects are. Ultrasonic waves that humans can't hear are emitted by the sensor ... useful for an array of projects ...

This one is an unusual smart home project, potentially - how to monitor a fish tank’s health with an AI-enabled ultrasonic sensor system. The detailed project is highlighted on Hackser.io and features ...

Now, researchers have channeled that idea to create an ultrasonic sensor array that gives its wearer increased situational awareness, or SpiderSense. Such technology may one day help the blind ...

when the teams at the Berkeley Sensor and Actuator Center collaborated to initiate research into piezoelectric-micromachined ultrasonic transducers (PMUTs). "We developed arrays of PMUTs ...