Just like title said, I would like to build a device that detect human body floating on the surface of water, preferably with detection range of 50 meter. The first thing I come to mind is infrared sensor. Is it possible to build it cheaply? If so, what sensor chip do you recommend?
I found many infrared sensors chip online but they are mostly for motion detection
I found many infrared sensors chip online but they are mostly for motion detection
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