In the above segment, we have learned the pin outs of a PIR sensor, now let’s move on to study a simple application of the PIR sensor. PIR Sensor Working A Motion Detection Circuit Using PIR Sensor There is a window which is made of typically coated silicon material to protect the sensing element. The infrared sensor itself is housed in a hermetically sealed metal to improve humidity/temperature/noise/immunity. This causes a positive differential change between the two bisects.When a human body leaves the sensing area,the sensor generates a negative differential change between the two bisects. When a human body or any animal passes by, then it intercepts the first slot of the PIR sensor. When the sensor is inactive, then the two slots sense the same amount of IR.The ambient amount radiates from the outdoors, walls or room,etc. The Fresnel lens is used to see that the two slots of the PIR can see out past some distance. These slots are made of a special material which is sensitive to IR. The PIR sensors are more complicated thanthe other sensors as they consists of two slots.
The Passive infrared sensors consist of three pins as indicated in the diagram shown above.
The below image shows a typical pin configuration of the PIR sensor, which is quite simple to understand the pinouts and, one may easily arrange them into a working circuit with the help of the following points: Pin Configuration of PIR Then this charge is further improved by a built in FET and fed to the output pin of the device which becomes applicable to an external circuit for further triggering and amplification of the alarm stages.The PIR sensor range is up to 10 meters at an angle of +15o or -15o.
The detected radiations are converted into an electrical charge, which is proportional to the detected level of the radiation. The term “passive”indicates that the sensor does not actively take part in the process, whichmeans, it does not emit the referred IR signals itself, rather passively detects the infrared radiationscoming from thehuman body in the surrounding area. The term PIR is the short form ofthe PassiveInfra Red.
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