how to Adjust PIR Angle Similar in functionality to Parallax's PIR sensor (555-28027), the wide-angle PIR sensor features a larger detection angle of 180°. This makes it ideal in applications where users need to track movements across a large, open area. The wide-angle PIR sensor is a pyroelectric device and it detects motion by sensing changes in the infrared levels emitted by surrounding objects. When motion is detected, the wide-angle PIR sensor outputs a high signal on its output pin.
The detecting distance of PIR motion sensors is 9 meters, and the detecting angle is 120˚ horizontally. Motions out of this range can't be detected.
Our PIR motion sensor is more sensitive to side-to-side movement than movement heading straight toward the camera. For example, when a person moves straight toward the camera (shown below), the PIR motion sensor will be less sensitive to the movement.
Please make sure that the PIR sensor or the camera is installed in the direction crossing the possible intruder instead of facing it so that it can detect motion more accurately.