In a smartphone, a proximity sensor is located by the phone speaker ... THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.

[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 iPhone's proximity sensor is one of its handier built-in features. When you raise your iPhone to your ear, its screen will automatically go dark due to the feature, saving battery and making ...