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This microwave "doppler"sensor works by detecting the interference of reflected microwaves caused by the human body. It seems to work well at up to about 5 metres. This data sheet may be useful: https://img.filipeflop.com/files/download/Datasheet_rcwl-0516.pdf
recommended.
What sorcery is this? I watched Andreas Spiess test this on YT and its every bit as fantastic as his video says it is!
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