Principles of PIR Sensors

PIR (Passive Infrared sensor)

PIR (Passive Infrared sensor) sensors, which are called motion detectors, can detect the temperature of a person or a flame. Humans or warm-blooded animals produce infrared light that can be perceived by such sensors. The front face of the sensor has a large number of fresnel lenses that focus the heat rays on various points on the IR sensor. The rays falling on the sensor are interpreted as present or absent with the sensor.

Advantages of PIR Sensors:

Sensitive horizontal movements are perceived very well.

The sensing area and angle can be adjusted very precisely.

It is also suitable for outdoor environment because only moving temperatures are detected,

In the detection area, the activity time can be adjusted with the light setting and the duration setting with the time setting option.

It can be listed as a temperature comparison system so that the temperature differences between winter and summer do not interfere with the detection quality.

There is a video about application of PIR sensor by using Arduino.

Preparing by Emre AKKAYA