Inside [Klaus]’ device is an Arduino Uno, an HC-SR04 ultrasonic distance sensor, and an Adafruit Wave Shield. Originally, this parking/distance sensor used a small TFT to display the distance to ...

[Nubmian] wrote in to share his experiments with measuring airflow in an HVAC ... [Nubmian] created a rig using a pair of typical ultrasonic distance sensors. He detached the two transducers ...