PIR sensor are capable of detecting tiny variations in infrared. Whenever an object moves through the range of the sensor, due to the friction between air and material, it creates infrarot and is captured by PIR.
PIR sensor's main component is pyroelectric sensor shown in figure (rectangular crystal behind the plastic cap). Along with this, some resistors, capacitors and other components used to create PIR sensors were BISS0001 ("Micro Control PIR Motion Detector IC."). BISS0001 IC takes the sensor input and processes the output pin appropriately HIGH or LOW.
Switch the clockwise rotation of the Distance Adjustment Potentiometer, increase the sensing distance (about 7 metres), thus reducing the sensing distance (about 3 metres).
Switch the clockwise rotation sensor Time delay potentiometer to the delay lengthened (600S, 10 minutes), shorten the delay (0.3 seconds) on the opposite side.
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