The HC-SR501 module is a PIR motion detector. This sensor works as a simple switch. The HC-SR501 has an all-or-nothing output. The high threshold makes it possible to know that a movement has been detected. The HC-SR501 is supported by ESP Easy firmware for ESP8266 WiFi modules.
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- The lowest price of Qunqi 10pack HC-SR501 Pyroelectric Infrared PIR Motion Sensor Modules for Microcontrollers was obtained on 14 January 2021 2 h 01 min.