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HC-SR505 is a passive infrared motion sensor. It can detect changes in the level of infrared radiation that will cause the module to function and detects motion.
The HC-SR501 Pyroelectric Infrared Sensor is used to detect the presence of people. It is commonly used in turning the lights on and off automatically when people arrive or leave. It is very reliable for robot projects which need human detection.
Socket with PIR senzor - GERMAN SOCKET
PIR2: 433MHz RF PIR Motion Sensor
PIR Mini Sensor Module with AM312