![]() In the following article, we’ll take a look at how digital video security and surveillance systems go about doing this and why conservation is a key term associated with this type of monitoring.ĭigital video camera security systems can initiate motion activated recording in different ways. There are software programs with human form recognition that require fairly high level CPUs to run, and I haven't tried these yet.Conservation is the key term in reference to motion activated recording. However, install one of these and you will learn how many animals enter your property - neighbors' dogs going on a walk and taking a detour on your lawn, cats prowling, birds eating worms, raccoons and skunks. These AIR units have been very reliable, not issuing false alarms and properly issuing alerts when the beam is broken. However, when an object passes between the transmitter and receiver and breaks the IR beam, an alarm is issued. In other words, the AIR transmitter emits an infrared beam that is received by the sensor - as long as the beam is unbroken, no alarm is issued. This requires more complex wiring, because both units must be hardwired and placed across the monitored path and facing each other. AIR sensors are more complex because they include their own infrared transmitter and a separate infrared receiver tuned specifically to the transmitter beam. There is a different type of infrared sensor that I have found reliable - ACTIVE infrared or AIR. Many conditions can cause such changes, other than human motion. Keep in mind that the "P" in "PIR" stands for passive - meaning that they are in effect infrared heat receivers that look for changes in infrared heat emitted by objects. On the other hand, sometimes they would not trigger at all from humans, especially when the humans were moving directly towards the sensor. I'd get hundreds of false triggers a day, especially in the summer. They would issue many false triggers, apparently from wind, air currents, heat reflections, sun movement, clouds, foliage movement, or whatever. I could never get them to work reliably, no matter what placement / settings /configuration I tried. This includes PIR plus microwave sensors. I'll share my experience with attempting to use PIR outside as a motion sensor to trigger camera recording. They'll be a lot dearer but should be better. The other option is to research exterior alarm motion detectors. It's got adjustable light level LUX (so can work during the day), as well as sensitivity and trigger time. I'm using one of these to switch some solar powered 12VDC lights on my front verandah, once I worked out the wiring diagram was incorrect it has been working quite well. There are a number of 12VDC PIR's on AliExpress that are cheap to experiment with. I'd imagine it would provide less false triggers than motion detection but you may also miss out on footage you want recorded. ![]() I haven't tried over riding the daytime sensor and using one as an alarm trigger for a camera. ![]() I use the lights as a "trigger" for the cameras at night (using the camera's motion detection.) I've got numerous PIR controlled lights and some get triggered by warm/ cold winds blowing at night. They're also more sensitive for objects crossing their beam pattern compared to someone directly approaching the sensor. Their sensitivity varies depending on climatic conditions, so the warmer it is the less sensitive they are. PIR's that won't be set off by cats/ dogs etc.
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