The Fresnel lens (the white plastic dome) must remain unobstructed. If mounting in a box, ensure the dome protrudes through a cutout.
On the corner of the module, you will find three solder pads or a jumper labeled and L . hw-416-b pir sensor datasheet
modules include a jumper to switch between two trigger modes: Non-Repeatable Trigger (L): The Fresnel lens (the white plastic dome) must
: Digital output signal. Transitions from 0V to 3.3V when motion is detected. GND : Common ground. 4. Key Features and Operation hw-416-b pir sensor datasheet