One way to accomplish this involves four HC-SR04 ultrasonic sensor units that transmit data through an Arduino into a Linux computer. The end result is a virtual touchscreen that can be made at home.

In the real world, missile systems use advanced radars ... To supply targeting data for the launcher, an Arduino Uno uses an ultrasonic sensor pair mounted atop a servo. As the servo rotates ...

The beamforming technology behind ADAR—used in SONAR, RADAR ... for in-air ultrasonic sensing. ADAR empowers autonomous robots with omnidirectional depth perception, enabling them to ‘hear’ their ...