[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. The ...

Here’s a comparison of the performance and limitations of inductive, capacitive, photelectric and ultrasonic proximity sensors.

Instead of measuring light, we measure the ambient voltage field on pin A5 and use it to detect if someone is too close to our Arduino. A5 is used as a “floating input”, but unfortunately it is very ...

Though it's not their primary role, proximity sensors can be harnessed to detect motion, and sometimes, even measure it. Here are some of the techniques in use today.

These differ from proximity and inductive displacement sensors in that they use an air-core coil instead of a ferromagnetic core. This eliminates the magnetic losses and thermal nonlinearities ...