So motion sensors can detect a human being that is 80 feet away?
Motion sensors cannot detect human beings, they can detect motion, variously of a heat source or a radio reflective object. Anything that is hot and moves, or reflects and moves will be detected. This is an important point unless the only thing that fits that description in the area it is observing is a human being.
One *could* detect motion with a PIR or RADAR sensor and then confirm it with image recognition, but I think the TS is expecting the detector to distinguish humans, hence my original question above, “does a big dog count as a person?”.
LiDAR has a range from 10cm to hundreds of meters. They use rotating mirrors to sweep the beam, so the number you'd need depends on the region you want to scan.
Yes, this is because of how the PIR sensors work. They depend on changes that have to do with lateral movement and the odd looking IR lenses on them are designed to maximize that.One thing you can do to defeat a motion detector is to walk straight at it. Eventually it may see you, but if you move across the field it will detect you fairly quickly. Even if you move slowly.
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