[Klaus] wanted some sort of aid for parking his car ... $4 ultrasonic sensor, decided to build his own speaking distance sensor (.de, Google Translation). Inside [Klaus]’ device is an Arduino ...

Living proof is this human-following robot/car that was build ... In addition to the Arduino, you’ll need the four wheels, batteries, infrared and ultrasonic sensors, jumper wires, a DC power ...

To supply targeting data for the launcher, an Arduino Uno uses an ultrasonic sensor pair mounted atop a servo. As the servo rotates, the returns from the ultrasonic sensor are plotted on a screen ...