Ultrasonic Sensor Buzzer Alert 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 ...

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 ...