[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 ...

Proximity sensor kit for Arduino free from Future A capacitive sensing evaluation kit from Cypress Semiconductor is being made available free to design engineers by distributor Future Electronics on ...

This lets him alert the Arduino when an object approaches the sensor without the need for polling or extra code on the Arduino side of things.