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Thread: Light goes off then straight back on!

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  1. #1
    Automated Home Sr Member eddr's Avatar
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    Default Light goes off then straight back on!

    Hi All,

    Since yesterday, my landing light is now coming on as it should when picked up by the PIR, but once it goes off it comes straight back on! The landing has short occupied time-out and the light object is set to only come on for 10 seconds after occupancy removed. When I check the occupied state after the light turns back on, it gets set to 'must be occupied'. The reason for the light turning on is occupied, and the PIR says it senses movement at the same time the light goes off?

    Does anyone know what is causing this strange behaviour ? It wasn't happening the day before (The only changes have been adding a module to the bathroom).

  2. #2
    Automated Home Legend Karam's Avatar
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    Could be that the PIR is detecting change of heat due to light switching. What is the relative positioning of the light and PIR and type of light? Was it colder than usual at the time?

  3. #3
    Automated Home Sr Member eddr's Avatar
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    I'd say same temp same as when it was working ok.

    Light is about third of a metre away from PIR.

    Any solution to this? Others dont do the same

  4. #4
    Moderator Kevin's Avatar
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    Does removing the bulb cause it to work correctly (as seen in Cortex) ? If so it would seem to be bulb heat related and you could try a lower wattage or better still a low energy bulb (if it's not on a dimmer).

    K

  5. #5
    Automated Home Sr Member eddr's Avatar
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    Good idea Kev ill try that when I can, probably tomorow!

    I thought Cortex was programmed to take this into consideration though (when lights turn off, pir/light level changing)?

    Anyway to add a delay so when light turns off PIR output is not valid for a set time?

  6. #6
    Automated Home Legend Karam's Avatar
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    Quote Originally Posted by eddr View Post
    I thought Cortex was programmed to take this into consideration though (when lights turn off, pir/light level changing)?
    It does for light level changes but not PIR. Though I've heard of another case of similar symptoms (though in this case when the room was unheated in winter) it is not commonly known for PIRs to trigger when lights are switched - particularly since you need the heat to be perceived to move as well as to change from background. Obviously it may be possible to ignore the PIR trigger just after a switch on but I think it would be better to understand and tackle the cause. Also I'm wondering about why it didn't occur at one point and then did later. Did installing the bathroom module involve anything else relating to the PIR module eg. wiring changes? Also what kind of light is it and what is the geometry of positioning - for example are both light and PIR in ceiling? Is light dimmed or switched?

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