If something is moving slowly in your field of view
That need to change to detect motion (e.g.
insensitive to slow changes: to avoid false triggers, you will set a lower threshold on the image portion.Sensor you can put the camera to sleep, now you have to continuosly check each frame power-hungry: comparing each frame with the previous means the camera must be always on.Video motion detection has its drawbacks, nonetheless: If a large portion of the image changed, it triggers. The camera frames, comparing each one with the previous looking for differences. On the other hand, video motion detection can fulfill all the above cases because it performs motion detection on For example, if a person comes intoĪ room and lies down on the sofa, the PIR sensor will trigger for as long as the person doesn't leave the room Sensor doesn't actually detects motion: it detects the presence of warm objects. it triggers even when no motion happened: the PIR tecnique is actually a proxy for motion detection.If you put it behind a window to detect people outside your home, it won't work it needs a clear line-of-sight: to detect infrared light, the PIR sensor needs no obstacle in-between itself and.In front of your house at 30 meters, it won't work If you need to detect people walking on the street it has a limited range: PIR sensors reach at most 15-20 meters.If you want to detect a car passing, it won't work "hot" is in its field of view (humans and animals, basically). you can only detect living beings: since it is based on infrared sensing, it can only detect when something.It's easy, fast and pretty accurate.īut the PIR approach has a few drawbacks: If this setup works fine for you, go with it. (a.k.a PIR, the one you find in home alarm systems) and take a photo when the PIR detects something. Most tutorials on the web focus on human detection, so they equip the Esp32 with an external infrared sensor detect if your cat jumps over the sofa while you're off.Many times you are interested in human movement, but you can actually want to detect: Motion detection refers to the task of detecting when something in your region of interest is moving.
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