AutoSteri is a small and compact automatic UV sterilization system that uses a PIR to detect a human and cleans when they leave.
Project tutorial by David Bershadsky
An Arduino UNO Flash and RAM update with the ATmega2560 as DIL 28 variant.
Project showcase by T.F. Mc Temucin
That depends on how powerful the led you use it and how widely the light is emitted from the led.
The pir sensor should be able to detect someone within ~10m
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