This is an Arduino-based Proximity Sensor circuit wired using the popular HC-SR04 Ultrasonic ranging module,used here for non-contact object detection purpose. The HC-SR04 module includes ultrasonic ...

Now, the venerable ultrasonic sensor joins the gallery of classics given a size change treatment, like the 555 timer we’ve seen two different takes on, or perhaps that one Arduino Uno.

Ballentine, W.M. 2023. Biophysical Interactions Between Meiofauna and Sand Habitats. PhD dis­sertation, University of South Alabama. Bell, S. 2010. Project-based learning for the 21st cen­tury: Skills ...