While a well-known use of this is sonar, ultrasonic sensors can also be put to use to make a radar-like system ... a 180-degree field-of-view and an Arduino takes and records measurements during ...

Inside [Klaus]’ device is an Arduino Uno, an HC-SR04 ultrasonic distance sensor, and an Adafruit Wave Shield. Originally, this parking/distance sensor used a small TFT to display the distance to ...