Transcription of PIR Motion Sensor - Adafruit Industries
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PIR Motion Sensor - Adafruit Industries
PIR Motion SensorCreated by lady ada updated on 2021-11-15 05:48:12 PM EST Adafruit IndustriesPage 1 of 25355681213141617181919202325 Table of ContentsOverview Some Basic StatsHow PIRs Work The PIR Sensor LensesConnecting to a PIRT esting a PIR Retriggering Changing sensitivity Changing Pulse Time and Timeout Length For older/other PIR sensorsUsing a PIR w/Arduino Reading PIR SensorsCircuitPython CodeExample ProjectsBuy a PIR Motion Sensor Adafruit IndustriesPage 2 of 25 Overview PIR sensors allow you to sense Motion , almost always used to detect whether ahuman has moved in or out of the sensors range. They are small, inexpensive, low-power, easy to use and don't wear out. For that reason they are commonly found inappliances and gadgets used in homes or businesses. They are often referred to asPIR, "Passive Infrared", "Pyroelectric", or "IR Motion " sensors. PIRs are basically made of a pyroelectric Sensor ( ) (which you cansee below as the round metal can with a rectangular crystal in the center), which candetect levels of infrared radiation.
Nov 15, 2021 · The PIR sensor itself has two slots in it, each slot is made of a special material that is sensitive to IR. The lens used here is not really doing much and so we see that the two slots can 'see' out past some distance (basically the sensitivity of the sensor). When the sensor is idle, both slots detect the same amount of IR, the ambient amount
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