Inside the light is an Arduino Nano, which reads from the ultrasonic sensor mounted underneath the enclosure and lights up the appropriate LED depending on the car’s distance.

In this mode, you can interface the HC-SR04 ultrasonic ping sensor with a servo motor and the main board (Only some reward tiers include the extra servo motor PCB and servo motor kit).

The equipment used here is an ultrasonic transducer and Arduino, and the production cost is about 250 dollars (about 25,000 yen). Ultrasonic spoofing attack on a Tesla S - WIRED Videos - The Scene ...