between a human and pet, but detect either or both.
Unfortunately, humans rolling on the floor can avoid
middle beam detection and only be picked up by lower
beam as pets.
Preventing False Triggering and Detecting More
The frequency spectrum of a human or pet moving or
someone who’s rolling on the floor will vary in frequency
content (typically between 0 to 5 Hz). A Fourier
Figure 2: Time-domain and fast Fourier transform signals for a walking human. (Source: Texas Instruments)
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