[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 mouse ring is powered by an ATmega32U4 microcontroller, integrated into the Atto Development Board. It features an STM’s ...

Proximity sensors are common enough in automation projects ... so [Ido] had the idea to use the sensor for wireless IR programming. The microcontroller on version two was switched to an ATtiny212 ...