What makes motion sensors prone to false triggering?

Example Concept: Motion sensors, such as PIR sensors, detect changes in infrared radiation, which can be affected by factors like temperature fluctuations, sunlight, or heat sources (e.g., HVAC systems). Ultrasonic sensors may misinterpret sound reflections from moving objects or environmental noise as motion. Microwave sensors can be influenced by electromagnetic interference or reflections from metallic surfaces. These factors can lead to false positives, where the sensor incorrectly signals motion detection.