dblaine, you should try one of the sensors from a motion activated outdoor light. In this case motion is detected by means of the PIR sensor, a passive infrared sensor. Our transmissions were clean, of course.

But when tried in 15 degree temperatures outdoors, the PIR's output stage can't supply 1 mA. This causes air convection inside the PIR.

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. Welcome to the Parallax Discussion Forums, sign-up to participate. This can also be exacerbated by the PIR signals bouncing off objects that might reflect heat. The output of the PIR drives an NFET gate and nothing else. It worked fine as always. When we transmitted on VHF at a radio club I used to belong to, we turned on the security lights at a house about 50 yards away because the PIRs that had been installed had very poor RF immunity.

1) Sudden infrared movement / heat changes in view of the detector. There are two things you can do to create a more reliable detection system (and this can deliver the functionality you are asking for). 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. 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. Usually these triggers will be minimal unless there are other heat sources around the camera that might attract insects like spiders even more. The datasheet has no published spec on output drive capability, but that much temperature sensitivity couldn't be normal operation. So to see if the false alarms might be caused by the output of the PIR floating a little, I put a 5k pull down on the output and tried it indoors.

In this case motion is detected by means of the PIR sensor, a passive infrared sensor. The owner of the house kept complaining about it, but wouldn't change the PIR units.

Do you have a radio amateur in the vicinity?

The fourth cause of false alarms is a direct draught striking the detector. Indoors, day or dark, it detects motion reliably. Note: This code is can be easily changed to a Basic Stamp 2. http://www.parallax.com/StoreSearchResults/tabid/768/txtSearch/x-band/List/0/SortField/4/ProductID/606/Default.aspx. Causes of false motion detection alerts or PIR triggering, Click here for more about missing movements, Quick Troubleshooting and other Common issues. it will occasionally go LOW to indicate that there is no movement, even though there is movement.

Calibrate the sensor. 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.

pets, vermin, fax, mailbox, radiator or boiler etc). The PIR sensor is very sensitive and is known to be creating false triggers, i.e. The PIR's is typically looking at places like a shaded garden or wall, with no obvious IR radiation sources or air convection, although the night sky and the city beyond is sometimes in the field of view.

False triggering of my driveway light is almost non existent. This sensor detects emitted infrared energy from objects (humans and animals, but also cars) in the form of 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. Check behind and inside the PIR for insects and identify objects that can move or rapidly change temperature (e.g.

For an in-depth understanding of how PIR sensors work please read more here. 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. But outside, day or night, it false triggers every several seconds. This causes air convection … I suspect this PIR may be defective.

For more on how to position your camera for optimum motion detection and recording click here. Click here for more about missing movements. 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. 2) White light momentarily blinding the detector. Your PIR also needs time to warm-up and the code below provides debouncing and warm-up example for the Basic Stamp 1. Make sure that your controller is doing some sort of debouncing on the PIR input otherwise you may get a lot of false starts. 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.


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