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PostPosted: Sun Oct 22, 2017 9:19 pm 
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I've just put a latern with a pir on it. The sensor adjust up and down vertically. Will it have the maximum distance if it's pointing straight or does the distance reduce as it angles down


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PostPosted: Sun Oct 22, 2017 10:59 pm 
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It depends on the way the sensor and its lens is configured* as to how far it can "see"
The "norm" is that the sensor looks at a downward angle, so the further down you angle it the less distance away it can "see"
Also bear in mind that a PIR is more sensitive to movement across its field of view than towards its field of view.

* You can get different lenses for some PIR detectors.

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PostPosted: Mon Oct 23, 2017 12:05 am 
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mawallace wrote:
I've just put a latern with a pir on it. The sensor adjust up and down vertically. Will it have the maximum distance if it's pointing straight or does the distance reduce as it angles down

PIR sensors use linear fresnel lenses. I'm certainly not an expert on optics, but the entire point of this type of lens is to absorb light from a large area with no specific central focal point (or to spread light linearly over wide area, which is why they're used in lighthouses). Moving it around will have an effect on the region it captures heat/light from, but shouldn't have a huge effect on the range for the area it can actually see. The more common problem is that they capture movement from too wide an angle, which is why many PIR sensors come with little plastic blanking clips to allow you to mask off areas to avoid unwanted triggering.

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PostPosted: Mon Oct 23, 2017 6:34 am 
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What do the instructions say? Usually they have a diagram show the distance and spread.



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PostPosted: Mon Oct 23, 2017 7:05 am 
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Rorschach wrote:
What do the instructions say? Usually they have a diagram show the distance and spread.


That is why I asked - there is no mention in the manual! (which is next to useless!)


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PostPosted: Mon Oct 23, 2017 5:58 pm 
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As I said previously, it depends on the lens that is fitted to the PIR as to how far forward it can see (Within reason)
Also I neglected to mention the mounting height, again the higher up it goes the further it can see, the down side is it also means most PIR's can not see anything close to them if they are high up.

If it were me I would put it up just out of arms reach and alter the angle of the sensor.

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Which is correct? Metre or Meter? Click the link. to find out more.

No such thing as "Thou shalt put this wire here, Thou shalt put that wire there" .............Take a picture BEFORE you do the job.

If gloom had a voice, it would be me. :mrgreen:

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