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Regarding your issue, please kindly note that since the human body temperature is generally constant at around 37 degrees which emits infrared rays with a specific wavelength of about 10um, PIR detection is based on the induction of the infrared rays emitted by the human body.
Therefore, the detection accuracy is highly affected by the installation conditions and environment. You could choose to do the below modification to improve the PIR detection accuracy:
1) It is advised to install the device at a height of around 2-3 meters above the ground and at an angle of 20 degrees downward;
2) Ensure the device is kept away from air conditioners, refrigerators, stoves, and other areas like directly facing the window where the air movement is active;
3) Try to avoid obstacles and interference such as huge furniture and large bonsai;
In addition, please note that it is also related to the direction of the human movement. The PIR sensor is the least sensitive to the radial movement response, and the most sensitive to the transverse direction (that is, the direction perpendicular to the radius) movement.
Meanwhile, when the ambient temperature increases in summer, and the ambient temperature and the human body temperature might become relatively close, the detection function and sensitivity of the sensor might decrease, and sometimes the triggering might be not very sensitive as well.
