We have implemented a near-ultrasonic communication protocol in the 18.5-20 kHz band, which is inaudible to most humans, using commodity smartphone speakers and microphones to transmit and receive ...

It has a PWM signal generator and a square wave output. It can also automatically identify the resistor or capacitor value using 3 scales for better approximation. The Garagino microcontroller was ...

In this paper, we present a single-chip 65 × 42 element ultrasonic pulse-echo fingerprint sensor with transmit (TX) beamforming based on piezoelectric micromachined ultrasonic transducers directly ...

Environmental and health monitoring requires low-cost, high-performance diethylamine (DEA) sensors. Materials based on metal–organic frameworks (MOFs) can detect hazardous gases due to their large ...

Oppo Find X9 series September launch expected, entire lineup may arrive with ultrasonic fingerprint sensor, periscope camera, and more ...

Wi-Fi controlled four-wheeled scout vehicle using dual Arduino Uno R4 boards, ultrasonic sensor, turret rotation, and LCD display for real-time obstacle detection.