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  2. Inductive sensor - Wikipedia

    en.wikipedia.org/wiki/Inductive_sensor

    Since the output of an inductive sensor has two possible states, an inductive sensor is sometimes referred to as an inductive proximity switch. [2] [3] The sensor consists of an induction loop or detector coil. Most often this is physically a number of turns of insulated magnet wire wound around a high magnetic permeability core, such as a ...

  3. Proximity sensor - Wikipedia

    en.wikipedia.org/wiki/Proximity_sensor

    An infrared proximity sensor Optical proximity sensor in a 2016 Samsung smartphone.A proximity sensor is a standard feature of most smartphones, disabling the touchscreen when positioned near an ear during phone calls; more recent (late 2019-early 2020) smartphones with OLED displays may have the sensor mounted under the display.

  4. ULN2003A - Wikipedia

    en.wikipedia.org/wiki/ULN2003A

    ULN2003A pinout Simplified ULN2003A logical pinout diagram.. The ULN2003A is an integrated circuit produced by Texas Instruments.It consists of an array of seven NPN Darlington transistors capable of 500 mA, 50 V output.

  5. Electromagnetic induction - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_induction

    the magnetic field B changes (e.g. an alternating magnetic field, or moving a wire loop towards a bar magnet where the B field is stronger), the wire loop is deformed and the surface Σ changes, the orientation of the surface dA changes (e.g. spinning a wire loop into a fixed magnetic field), any combination of the above

  6. Induction loop - Wikipedia

    en.wikipedia.org/wiki/Induction_loop

    An induction or inductive loop is an electromagnetic communication or detection system which uses a moving magnet or an alternating current to induce an electric current in a nearby wire. Induction loops are used for transmission and reception of communication signals, or for detection of metal objects in metal detectors or vehicle presence ...

  7. Hall effect sensor - Wikipedia

    en.wikipedia.org/wiki/Hall_effect_sensor

    Hall sensors are used for proximity sensing, positioning, speed detection, and current sensing applications [1] and are common in industrial and consumer applications. Hundreds of millions of Hall sensor integrated circuits (ICs) are sold each year [ 2 ] by about 50 manufacturers, with the global market around a billion dollars .

  8. Photoelectric sensor - Wikipedia

    en.wikipedia.org/wiki/Photoelectric_sensor

    Remote photoelectric sensors used for remote sensing contain only the optical components of a sensor. The circuitry for power input, amplification, and output switching is located elsewhere, typically in a control panel. This allows the sensor, itself, to be very small. Also, the controls for the sensor are more accessible, since they may be ...

  9. Bipolar junction transistor - Wikipedia

    en.wikipedia.org/wiki/Bipolar_junction_transistor

    Simplified cross section of a planar NPN bipolar junction transistor BJTs consists of three differently doped semiconductor regions: the emitter region, the base region and the collector region. These regions are, respectively, p type, n type and p type in a PNP transistor, and n type, p type and n type in an NPN transistor.

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