Instead of being named after an inventor or some strange historical quirk (I’m talking to you bayonet light fittings*), the word PIR is actually an acronym that stands for Passive Infrared, and that gives us a clue into how they
Instead of being named after an inventor or some strange historical quirk (I’m talking to you bayonet light fittings*), the word PIR is actually an acronym that stands for Passive Infrared, and that gives us a clue into how they