A small PlatformIO/Arduino project that measures distance using an ultrasonic sensor (HC-SR04 or similar) and prints the measured distance over the serial port. This README explains how to open the ...

In this tutorial, you will learn how to send WhatsApp messages directly from an Arduino UNO R4 WiFi using the CircuitDigest Cloud Whastapp API. Instead of using a GSM module, SIM card, or complex ...

Abstract: This paper provides details about the design and operation of a Collision Avoidance System in smart cars, with the Arduino board as the central control unit, interfaced with an ultrasonic ...

Without any delays, here are the best Phones with Ultrasonic Fingerprint Sensors (March 2026) that make the cut: ...

Ultrasonics refers to signals that are above the human hearing span (>20 kHz), and usually in the 40- to 70-kHz range. These signals are used like radar—they’re radiated toward a target and reflected ...

Abstract: This work investigates the potential of using simple inline no-core fiber (NCF)-based multipoint acoustic sensors providing high frequency bandwidth and dynamic range for ultrasonic guided ...

LaserEye is a security monitoring system utilizing ESP8266 board, a laser, and a sensor to detect trespassing. Integrated with Firebase Realtime Database, it provides real-time notifications through ...

The sendEmail () function is responsible for triggering the email alert when an object is detected. A secure Wi-Fi client is ...