This circuit generates inaudible ultrasound to make a barrier across the entry. At the moment the circuit detects a break in the sound barrier, it generates a loud alarm indicating the entry of a ...

In order to achieve remote control ultrasonic measurement system, wireless communication technology and ultrasonic measurement techniques are combined to develop an infrared-based communication ...

In this article, the detection of distance with ultrasonic wave based on finding travel time forward and backward or time of flight (TOF) with oscillator circuit at the receiver that operates under ...