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A comment on Building an occupancy sensor with a $5 ESP32 and a serverless DB. Parent comment

Re:Building an occupancy sensor with a $5 ESP32 and a server... by greggsy on Tuesday November 14, 2023 @09:16AM (#38263529)
Wouldn’t three dimensional tracking need four antennas?
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Re:Building an occupancy sensor with a $5 ESP32 and a server... by rsaxvc on Tuesday November 14, 2023 @11:24PM (#38273338)
Three appropriately spaced antennas will give you azimuth and elevation of a ray to the transmitter, but not distance.

But using two of the above in different, known locations would allow you to compute the intersection to a 3D location.

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