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IR Rangefinder

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A PIR sensor will only "see" heated (or cooled) bodies (whether human, animal or anything else) that is moving across more than one of its "zones", so it won't keep your creation from hitting obstacles, as they would most likely be still and at, or close to, the ambient temperature.

As it stands, it won't be able to "see" you walking in front of you, unless you're seriously waisted, zig-zagging your route.

That said, if you want to detect a static body you could allways move the sensor - as long as the body is crossing the zones seen from the PIR's perspective and it's temperature differs from the backgrounds (otherwise it would be invisible to PIR detection).


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