PIR or "Passive Infrared Sensors" have many applications, especially in motion detection. They are a cornerstone of home automation systems. And recently, I got a few promising new detectors to compare—time for a closer look.
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Links:
AM312: https://s.click.aliexpress.com/e/_dUG...
HC-SR501: https://s.click.aliexpress.com/e/_dZ8...
HC-SR505: https://s.click.aliexpress.com/e/_d6H...
EKMC1603111: https://s.click.aliexpress.com/e/_d8Q...
EKMC1601111: https://s.click.aliexpress.com/e/_dTg...
AM612 (5pcs): https://s.click.aliexpress.com/e/_dTK...
AMG8833: https://s.click.aliexpress.com/e/_dVQ...

ESP32: https://s.click.aliexpress.com/e/_dYi...
ESP32 shield: https://s.click.aliexpress.com/e/_d66...
HC_SR501 hack: https://lowpowerlab.com/guide/motionm...

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