What triggers a PIR sensor?

Passive infrared (PIR) sensors use a pair of pyroelectric sensors to detect heat energy in the surrounding environment. These two sensors sit beside each other, and when the signal differential between the two sensors changes (if a person enters the room, for example), the sensor will engage.

Can PIR sensor detect insects?

Insects and small animals set off PIR motion detectors because they emit the infrared (IR) energy needed to activate the devices. If an insect or small animal gets close enough to the sensor, then they will be able to activate it.

Can a fly set off a motion detector?

Unfortunately, insects are attracted to infrared light and will fly in front of the camera’s view. Lowering the sensitivity on the camera will help somewhat, but if insects fly in close, the IR will reflect off of them and still trigger motion.

Can a Moth set off a motion sensor?

Motion sensors work on “size”, but a moth flying by at 2 inches seems like a person at 6 feet. Think about it, if a moth flew by your eyes at two inches it would look like a 747. So, yes a moth can set it off, if it flies close by the sensor in the upper console by the switches.

Can spiders trigger PIR?

Spiders so big they’re triggering alarms. Some are so big that they’re setting off burglar alarms! Actually, in reality they don’t have to be huge to do this; all it takes is a spider to crawl directly over a sensor to fool it into thinking there’s some kind of intruder.

What can trigger a house alarm?

Excessive dust, spider webs, and loose sensors and detectors can all be the source of false alarms.

Can a cat set off a house alarm?

Whether it’s an active puppy or restless budgie, pets can very easily trigger alarms that rely on movement sensors. As notorious nocturnal prowlers, cats can be especially troublesome in this respect, jumping onto furniture or in and out of cat flaps.

Can a cat trigger a motion sensor?

Motion detectors and pets can get along, but only if you have the right equipment and it is installed correctly. Otherwise, the cats will continue to trigger the motion detectors around the house. Fortunately, there are a few tricks to help you reduce the number of false alarms from your motion detectors.