Is PIR dome weather-resistant

KatyBri

Is the PIR sensor's dome weather resistant?

Will it stand up to direct sunlight, temperature swings, rain, etc. without the dome cracking?

Chris Savage

Probably not since it was designed for indoor use under room temperature conditions. For extended weather you should definitely get a module designed for that purpose.

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Chris Savage
Parallax Engineering

SRLM

You might be able to get away with using a clear plastic cover over the module (for weather protection) and mounting it in a shady spot. As long as you don't live in Minnesota, you could probably get by with this. A suggestion for colder climates: mount it next to an outdoor security light. This could provide some local heat. At $10, it's fairly reasonable to do some field research. Of course, it probably shouldn't be used in a critical application...

GeorgeL

Does the PIR use heat for detection, I though i Read it used iR

SRLM

Hot objects give off infrared radiation. So, humans (being the relatively warm things that we are) are like little light bulbs in the IR spectrum. We can't see it, but there's no reason a sensor of one kind or another can't.

LilDi

Care should be taken when housing a PIR is a weather tight enclosure. Most plastics like polycarbon, vinyl, and acrylics as well as glass will greatly attenuate IR light in the 8um to 14um wavelength, which is the range that most PIRs operate in. Freznel Technologies sells plastic materials that will work, but these types of plastic are ussually a bit pricey. They claim their materials are weather resistant, even in direct sun light for years.

http://www.fresneltech.com/

william chan

Are fresnel lenses still protected by patents?
Does that mean that you should not make your own plastic lenses?

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