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 ...

I recently had to build an infrared close proximity sensor that could tell if something was dropped in a parcel delivery drop box. ... Here is the diagram of my Arduino infrared close proximity sensor ...

Vishay Intertechnology, Inc. today added to its optoelectronics portfolio by introducing a fully integrated proximity sensor that combines an IR emitter, photo-pin-diode, signal processing IC, and ...