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  2. Rotary disc shutter - Wikipedia

    en.wikipedia.org/wiki/Rotary_disc_shutter

    Adjusting the shutter angle affects the amount of time that film is exposed to light. A rotary disc shutter is a type of shutter. It is notably used in motion picture cameras. Rotary shutters are semicircular discs that spin in front of the film gate, alternately allowing light from the lens to strike the film, or blocking it.

  3. Lighting control system - Wikipedia

    en.wikipedia.org/wiki/Lighting_control_system

    A complete sensor consists of a motion detector, an electronic control unit, and a controllable switch/relay. The detector senses motion and determines whether there are occupants in the space. [9] It also has a timer that signals the electronic control unit after a set period of inactivity.

  4. Motion detector - Wikipedia

    en.wikipedia.org/wiki/Motion_detector

    A motion detector attached to an outdoor, automatic light. A motion detector is an electrical device that utilizes a sensor to detect nearby motion (motion detection).Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area.

  5. Passive infrared sensor - Wikipedia

    en.wikipedia.org/wiki/Passive_infrared_sensor

    A PIR motion detector used to control an outdoor, automatic light. A camera trap with PIR motion detector. An indoor light switch equipped with PIR-based occupancy sensor [1] A PIR-based motion detector is used to sense movement of people, animals, or other objects. They are commonly used in burglar alarms and automatically activated lighting ...

  6. The best digital photo frames of 2025 - AOL

    www.aol.com/lifestyle/best-digital-photo-frames...

    The built-in motion sensor not only detects when people are present, but also adjusts screen brightness depending on the room's ambient light. This is the rare frame that doesn't have a touch screen.

  7. Electricity on Shabbat - Wikipedia

    en.wikipedia.org/wiki/Electricity_on_Shabbat

    However, it is prohibited to knowingly walk past a motion sensor which switches on a light on Shabbat if the street or place is dark and because the turning on of the light substantively benefits the person, and it is a pesik reisha denicha leih (Aramaic: פסיק רישא דניחא ליה, loose translation: "an inevitable resultant action ...

  8. Daylight harvesting - Wikipedia

    en.wikipedia.org/wiki/Daylight_harvesting

    All daylight harvesting systems use a light level sensor, a photosensor, to detect the prevailing light level, luminance or brightness, in open-loop or closed-loop systems. Photosensors are used to adjust electric lighting based on the available daylight in the space.

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    mail.aol.com/d?reason=invalid_cred

    AOL Mail is free and helps keep you safe. From security to personalization, AOL Mail helps manage your digital life Start for free

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