Too sensitive PIR detectors - how to reduce sensitivity?

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  • Level 5  

    I am looking for hints on how I can solve my problem.
    Well, I made the wooden terrace myself and thought that I would install the led strip in the front board (the terrace is low, it has only one degree). As I thought I did. Then I figured out that I would like the power of the remote control to choose different lighting modes. I bought the right items and currently there are 3 modes: enable, disable and enable for motion detectors.

    I have some problems with this 3 mode.
    I bought 7 Orno detectors -> OR-CR-211 (unfortunately I can't place the link: /)
    They are connected in parallel and placed so that they cover the area of interest to me.

    The problem is that they are damn sensitive (even in reduced sensitivity they catch me from about 6-7 meters). I have set the maximum excitation time (8 min) and the effect is that they shine almost all the time. To my eye, there is no error in the installation, so do not focus on it, because I have already tested it. It's more about their location. They are very close to the ground and probably even a worm running in the grass, due to its close proximity to the sensor, is able to arouse them. Another thing is that the area is not yet fenced and there are roaming neighbors' cats, etc.

    My current idea for now is to paint (cover) the bottom half of the sensor so as to at least exclude any bugs and mice running in the grass. You can also try to paint over the "sections" on the sensor, but it is so small that I do not know if it makes sense.

    Could you give me a reasonable idea how to deal with this situation? I warn you that hunting for cats and mice is out of the question ;)

    I paste an illustrative photo for a better understanding of matter:

    Too sensitive PIR detectors - how to reduce sensitivity?

    Thank you in advance for any help! :)
  • Level 6  
    And you can't switch the LUX switch to the moon position? Then it will turn on only at dusk. And of course TIME can also be set to a lower value like 8 minutes. Move SWITCH for example 5 seconds. Of course, when testing the device during the day LUX should be set to the sun icon :)
  • Level 5  

    Of course it is possible. And that's how it is done. The detectors needlessly activate only after dusk ;)
    Changing the time is obvious, but I don't want to have a disco when I'm sitting on the terrace with a beer in my hand because I'm going to get wet :P
    I mean some other solution :)
  • Level 6  
    A By accident this model is not intended for indoor use? :)

    Added after 4 [minutes]:

    take a look if it's not an ip20, because you know at the first rain you won't have to worry about whether it works or not ;) because it certainly won't work ;)
  • Level 5  

    Relax, I'm a fairly clever man. Everything is hidden in hermetic cans.
    They survived the winter and more than one rain :)

    Anyone have any ideas ..? Pls?
  • Automation Specjalist
    Because it is IP20 but the electronics can be hidden in a tin. Installation height according to the instructions is 18-2.5 meters, not just above the ground where there is a large temperature difference and winds blow.
    However, if you want to, it can do some AND logic to eliminate false excitations at least in part. For example, add a microwave sensor in series, e.g. ERS-60, which has better regulation of the operating range. Or at all done on the microwave alone.
  • Level 5  
    I have already experimented with microwaves and these in turn would have to be hidden under the boards. Placed there have a hopeless range ... I'd rather just limit the sensitivity of those I have.
  • Specialist electrician
    It seems to me that the basic problem is the detector mounting height. They will react to everything that moves at their height, including grass, leaves, etc. In my opinion, a dead end.
  • Level 5  
    As far as I know, PIR detectors react to infrared and more specifically to move objects with different temperatures. The grass is at ambient temperature, so its movement is not detected by the detectors. If I'm muddy, somebody correct me.

    I know that they are installed too low. Too close to the ground means that they look at everything as if through a magnifying glass (even a small object because of its proximity to the detector is perceived as large). That's why I have to "anesthetize" them ...
  • Specialist electrician
    I do not think that the ambient temperature is homogeneous in this case. Its changes occur as a result of which the detectors wake up. Not for free, virtually every detector manufacturer publishes information: "There should be no moving objects in the detection field (bushes, trees, tall grasses, etc.)." [example from Jablotron JA-60V], but of course I can be wrong ...
  • Level 5  
    Perhaps. I don't know anymore. Even in this case, painting the bottom half should do the trick ...
  • User removed account  
  • Level 5  

    okay, so it remains only what I felt from the beginning ... I will try :)