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 10Pcs HC-SR501 Human Infrared Sensor Module Including Lens was obtained on 4 August 2021 3 h 06 min.