Displays “Bus is coming!” on the LCD. Sends a Bluetooth message to a connected phone. Shows distance data in the Serial Monitor.

Without any delays, here are the best Phones with Ultrasonic Fingerprint Sensors (November 2025) that make the cut: ...

This project involves using an Arduino to measure distances using an ultrasonic sensor and controlling a buzzer and LED based on the measured distance. The provided Arduino code performs the following ...

Abstract: Urban flooding remains a critical challenge, exacerbated by inadequate drainage systems and the lack of timely early warning mechanisms. This paper presents a sustainable urban flood ...