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Causes of false motion detection alerts or PIR triggering

Moobox cameras have a PIR sensor.

In this case motion is detected by means of the PIR sensor, a passive infrared sensor. This sensor detects emitted infrared energy from objects (humans and animals, but also cars) in the form of heat.

In general differences of around 5-10º Celsius compared with the ambient temperature in the field of view and within a 10m /30ft range of the camera are detected.

However, other factors can also impact on PIR activation

1) Sudden infrared movement / heat changes in view of the detector. Check behind and inside the PIR for insects and identify objects that can move or rapidly change temperature (e.g. pets, vermin, fax, mailbox, radiator or boiler etc).

2) White light momentarily blinding the detector. This can also be exacerbated by the PIR signals bouncing off objects that might reflect heat. For example, if your PIR is facing glass or metallic objects this can cause other direct or even indirect heat sources to cause the PIR to register a heat differential sufficient to cause triggering.

3) Direct draught striking the detector. This causes air convection inside the PIR. Make sure any adjacent cable and screw holes are totally sealed and don’t forget any hole where cables comes through the cavity wall or ceiling in the proximity of the camera.

4) Insects (including spiders, flies), birds and other local wildlife (foxes etc) can also cause PIR triggers but these are highly dependent on the speed of their movement in front of the sensor, proximity and heat differential being within the PIR detection range. Usually these triggers will be minimal unless there are other heat sources around the camera that might attract insects like spiders even more.

5) If your camera is low on battery this can also cause the PIR to trigger so be sure to top up battery charge whenever you get the low battery alert or notice the battery indicating 20% or less in the app.

6) Also note, that since birds, insects, etc can trigger the PIR when you review the footage you may or may not see anything depending on how fast they passed the PIR so seemingly 'empty' video clips could have been triggered by movement and it may just be that the camera has not captured it fast enough. Click here for more about missing movements.

If you are seeing a lot of false PIR triggers it might be worth repositioning your camera elsewhere to test to rule out any or all of the above.

Camera placement might require fine tuning to optimise triggering and minimise false positive alerts, but you should always expect some measure of false alerts due to the myriad of factors above.

For more on how to position your camera for optimum motion detection and recording click here.

For an in-depth understanding of how PIR sensors work please read more here.