[mircemk] shows how to create a simple non-contact proximity sensor using little more than an Arduino Nano board, and a convenient software library intended to measure the value of capacitors.

What’s the radar enthusiast to do? While it’s not radar, subbing in ultrasonic sensors is how [Dzl] built this sonar imaging system using a lot of radar principles. Initial experiments ...

The small, cylindrical sensors can be installed nearly anywhere within a watershed. They use a continuous series of ultrasonic pulses to detect changes in proximity between the sensor and the ...