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Using a PIR to turn a light OFF

AndyC

Oct 10, 2017
2
Joined
Oct 10, 2017
Messages
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Hi!
I'm trying to find a "reverse PIR" (for want of a better description)! In other words, one where the light is permanently on, then when the PIR detects motion, it turns the light off, then after a fixed period the light automatically comes back on again. Anyone know where I can buy such a thing? I've googled it extensively, but - as you'd expect - all searches end up on pages talking about using PIRs in their normal switching-stuff-on role.
Failing that, anyone know how to make one? I'm an absolute electronics novice, but happy to try to follow a set of instructions! :)
Cheers,
Andy
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
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25,510
Connect the pir to a relay and use the normally closed contacts to drive the load. When the pir activates, the relay is pulled in, turning the light off.
 

AndyC

Oct 10, 2017
2
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Oct 10, 2017
Messages
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Cheers guys! Shall ponder the relay option - that sounds like a possibility. Ta!
 

duke37

Jan 9, 2011
5,364
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Jan 9, 2011
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5,364
There may be a changeover relay in the PIR or you may be able to fit one.
 
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