Proximity sensors detect the presence or absence of objects using electromagnetic fields, light and sound. There are many types , each suited to specific applications and environments.

So, with just two cheap modules, you can build a laser proximity sensor—whether it is the thru-beam type or the reflective type. But I will not go into the build ideas as there are countless tutorials ...

The trigger/amplifier circuitry inside the sensor is used to monitor the amplitude of the oscillator, and at certain levels (predetermined levels) the circuitry switches on (or off) the sensor/switch ...

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The switches operate at 25 to 70°C, are compatible with most standard proximity switches, ... The Series includes N.O. and N.C. types and pnp and npn configurations, ...

It’s been shown that integrated IR-LED proximity sensors don’t have any more crosstalk than an individual sensor due to its double-molding type of package (Fig. 2). 2.

The idea is pretty neat, so [Ivan] decided to implement it for mains devices by making this proximity switched outlet box. A Sharp GP2D12 infrared distance sensor is the key to the system.

An Apple invention detailed in a patent application published Thursday describes a method of decoupling a keyboard's mechanical feel from its electrical functionality using proximity sensors ...

However, a new inductive sensor has arrived that could change the face of proximity sensing. Proximity-Sensing Applications. In terms of common applications, one of the most prevalent is the ...