[Solved] Influence of the number of Fresnel lens fields on the sensitivity of the ORNO motion sensor

I wanted to ask you if the number of fields that the lens mentioned in the topic has has an impact on the sensitivity of the sensor?
I want to know this because in a small room (2x3m) I have made lighting that is switched on when motion is detected. It often happens that despite someone being in the room and moving around in a small area of the room, the sensor does not detect movement and the light goes out. I suspect that the problem may be poor detection resolution, and if so, is the number of fields in the lens responsible for this. The sensor is located in the corner of the room near the ceiling almost above the front door. I tested both the wall and ceiling ones. Both tended to be among the smaller ones with a small lens, as I also care about small dimensions and their concealment.

ORNO OR-CR-211 - identical to this one, but from a different company
ORNO OR-CR-205
ORNO OR-CR-201/W - I also tested a similar one to this one, it came from a demobilised lamp; unfortunately there are no descriptions on it.

The purpose of the sensor is only to control the lighting.
I am planning to test the ORNO OR-CR-222 360st, because as far as I can see, there are definitely more fields in the lens than in the above-mentioned ones. I just need to know whether this will make the sensor detect movement more often.

The sensitivity of the detector is one thing, the 'sensitivity' of the detector as a whole is another, the number of fields is a third.
The lens is responsible for what is focused on the detector and from where. So such a lens will have its own spatial characteristics, depending on the number of halves and its shape is about what you have here in the picture:
https://jablotron100.pl/ja-100/czujki-przewodowe-bus/JA-110P

If there is movement in the blind spot, it will not detect it. Don't test it, just apply the characteristics to the room and find out whether it helps or not.

servee79 wrote:

I wanted to ask you if the number of fields that the lens mentioned in the topic has has an effect on the sensitivity of the sensor?

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The size, the area of focus affects the sensitivity.
Response is affected by whether the person is tightly clothed.

Give a microwave sensor.

servee79 wrote:

I just need to know if this will make the sensor detect motion more often

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It should. That it doesn't detect presence in some areas is a matter of sensor placement. Ideally, a person should "cross" successive fields.

servee79 wrote:

It often happens that despite someone being in the room and moving around in a small area of the room the sensor does not detect movement and the light goes out. I suspect the problem may be poor detection resolution, and if so, is the number of fields in the lens responsible for this.

Yes, the number of fields is responsible for this.

Thanks for your help and confirmation of my assumptions.
I don't want a microwave sensor because from what I've read it "sees" through walls. I don't need that, and even such a phenomenon would be disadvantageous.

servee79 wrote:

Microwave detector I don't want because from what I've read it can "see" through walls.

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Where did you read this in because it made me curious.

servee79 wrote:

I don't want a microwave detector, because from what I've read it "sees" through walls.

Through walls, like through walls but through doors for sure.
However, it is possible to set the sensitivity accordingly, as well as other parameters.

sosarek wrote:

Where did you read this in because it made me curious.

In the company where I work often in the 'invention department' colleagues would leave the light on, usually out of absentmindedness.
The idea of installing a motion-controlled lamp came up.

I was surprised to find that often, despite no one being there, a light could be seen on at the end of the corridor in the gap of an ajar door. After all, no one had even gone in or approached there for almost an hour.

It turned out that the sensor can react to movement on the other side of the wall. I checked it myself, just by waving my hands and walking around the room, I could see a glimmer of light at the end of the aforementioned corridor.
Reinforced wall, 10-storey block.

I have a microwave sensor that 'sees' through a 30cm solid brick wall. The sensor is 2m away from this wall.

Microwaves penetrate walls so microwave detectors will also see movement through the wall, unless the wall is metal or densely reinforced.

It can be adjusted so that the usable area remains. And it does not react to movement outside the room.

In relation to what you wrote after my last post I have two questions for you regarding the microwave sensor.
1. will a microwave sensor give me more resolution than a PIR? So that it detects smaller movements.
2. what is used to set whether motion behind the wall is detected? Additional apertures on the sensor to narrow the field of view, or using a potentiometer to reduce the wave power?

Ad1: Mostly yes.
Ad2. With the potentiometer you reduce the range of operation.

kkknc wrote:

With the potentiometer you reduce the range of operation.

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Not necessarily.
See for example: this Link .

servee79 wrote:

It often happens that even though someone is in the room and moving around in a small area of the room, the sensor does not detect movement and the light goes out.

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You can use an occupancy sensor:
CLICK .
Just what about the sleeping cat .

kkas12 wrote:

kkknc wrote:

With a potentiometer you reduce the range of operation.

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Not necessarily.
See for example: this Link

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I don't really know what this is about.

You will not find any potentiometers in this sensor at the bottom of the page. And it is possible to adjust all parameters.

Thank you for your help.
I bought in OBI a sensor as in the link .
The lens has dozens of fields and the sensor itself has two PIR sensors inside. Its sensitivity is very good.
Possibly a clone of the STEINEL IS 180-2 sensor, from the outside both look very similar.