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.

Code to measure distances using an ultrasonic sensor connected to pins 9 (trigger) and 8 (echo) on the Arduino Uno. The distance is calculated in centimeters and inches, and displayed on the Serial ...

This project uses an HC-SR04 ultrasonic sensor and Arduino UNO to measure the distance of objects in both centimeters and inches. The measured data is displayed on an I2C LCD. The project was ...