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A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors . PIR sensors are commonly used in security alarms and automatic lighting applications.
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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.
Normally, light from the light source shoots straight across and misses the sensor. When smoke enters the chamber, it scatters the light, which then hits the sensor and triggers the alarm. Photoelectric smoke detectors typically respond faster to a fire in its early, smoldering stage, before the source of the fire bursts into flames.
Coffee drinkers may want to think twice before having large doses of caffeine several hours before bed — if they want a good night's sleep. A new study suggests that certain doses of caffeine ...
4. Certain Sushi Rolls. Pay attention to the descriptions when you read the menu at your favorite sushi joint, guys.One Redditor explained that the only difference between her restaurant's $3.75 ...
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