Pir Sensor Manual -

Most sensors have two internal slots. When you walk past, you enter the first slot’s view and then the second, creating a "differential" signal that the sensor recognizes as motion.

That white plastic dome isn't just a cover; it’s a Fresnel lens that divides the area into multiple detection zones, significantly increasing the sensor's range and accuracy. Essential Setup & Installation Tips Pir Sensor Manual

Proper placement is the difference between a reliable system and a headache of false alarms. How to Wire a PIR Sensor: A Simple DIY Guide Most sensors have two internal slots