1. When there is dirt on the window, it will affect the detection performance.
2. When the ambient temperature and the human body temperature are close, the detection and sensitivity are significantly reduced, sometimes causing short-term failure. The recommended minimum temperature difference between the ambient temperature and the human body temperature needs to reach at least 4 ° C.
3. When designing the circuit, pay attention to anti-interference measures to prevent false alarms caused by radio frequency interference.