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Passive infrared sensor - Wikipedia PIR sensors are often referred to simply as "PIR", or sometimes "PID" (passive infrared detector) The term "passive" indicates that the device does not emit energy, but detects infrared radiation (heat) emitted or reflected by objects
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How PIRs Work | PIR Motion Sensor | Adafruit Learning System To begin explaining how a basic sensor works, we'll use this rather nice diagram The passive infrared (PIR) sensor itself has two slots in it, each slot is made of a special material that is sensitive to IR
What Is PIR Sensitivity and How Does It Affect False Alarms? PIR, or passive infrared sensors, are commonly used to detect motion by measuring changes in heat energy While PIR sensors are highly effective, their sensitivity levels play a significant role in how accurately they detect real threats (and how often they might trigger false alarms)