This is an Arduino-based distance detection system using an HC-SR04 ultrasonic sensor. When an object comes within 100 cm, the system activates a buzzer with random tones and lights up an LED.

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The technology is based around an ultrasound sensor that plugs into a smartphone and uses the device’s screen to display the images. Conventional ultrasound technology is based around different ...

This paper presents an attack enabling adversaries to exfiltrate data over ultrasonic waves from air-gapped, audio-gapped computers without external speakers. The malware on the compromised computer ...

An electrochemical DNAzyme sensor for sensitive and selective detection of lead ion (Pb2+) has been developed, taking advantage of catalytic reactions of a DNAzyme upon its binding to Pb2+ and the use ...

Browse 500+ Arduino projects with downloadable code and circuit diagrams. ... How to build a Smoke and Fire Alarm System using Arduino with SMS Notification. ... How to build Blind Stick using Arduino ...