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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- This product is available at FastTech, LightInTheBox.com and MiniInTheBox.com, GeekBuying, Banggood, Amazon.com, TOMTOP Technology Co., Ltd, Ebay.
- At fasttech.com you can purchase HC-SR501 Pyroelectric Infrared PIR Motion Sensor Detector Module for only $1.44, which is 92% less than the cost in Banggood (CHF 16.99).
- The lowest price of 10Pcs HC-SR501 Human Infrared Sensor Module Including Lens was obtained on 30 January 2019 23 h 14 min.