[Klaus] wanted some sort of aid for parking his car, and after running across a $4 ultrasonic sensor, decided to build his own speaking distance sensor (.de, Google Translation). Inside [Klaus]’ ...

Producing items onto a screen simply by touching the air is a marvelous thing. One way to accomplish this involves four HC-SR04 ultrasonic sensor units that transmit data through an Arduino into a ...

Under-display fingerprint sensors, for better or for worse, have become very popular on Android smartphones. Now, Redmi is showing off a new under-display fingerprint sensor that works through an LCD ...