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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- At ebay.com you can purchase New HC-SR501 Infrared PIR Motion Sensor Module for Arduino Raspberry pi for only $0.99, which is 94% less than the cost in TOMTOP Technology Co., Ltd ($16.33).
- The lowest price of 10pcs HC-SR501 IR Pyroelectric Infrared IR PIR Motion Sensor Detector Module was obtained on 12 April 2021 3 h 11 min.