It has become a common sight, a must-have feature on modern cars, a row of ultrasonic sensors embedded in the rear bumper. They are part of a parking sensor, an aid to drivers for whom depth percep… ...

That’s right, these parking sensors are powered by an Arduino board, and the only extra components that were used in the project are a HC SR04 ultrasonic sensor, an active buzzer, and jumper wires.

Ultrasonic sensors are covered within special acoustically transparent plastics. How They Work. The design of a robotic ultrasonic system is similar to collision avoidance and parking systems in cars.