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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 rsaxvc on Monday November 13, 2023 @11:11PM (#38259054)
If you want to get really spicy, you can use two antennas and an SDR to compute angle of arrival using nothing but a BLE advertisement's data . This is different from BLE AoA as it doesn't require a cooperative transmitter.
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Re:Building an occupancy sensor with a $5 ESP32 and a server... by alias_neo on Tuesday November 14, 2023 @02:10AM (#38260044)
If you want to get really, really spicy, use three devices/antennas and you can roughly track in three-dimensional space.
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Re:Building an occupancy sensor with a $5 ESP32 and a server... by milkshakes on Tuesday November 14, 2023 @05:41AM (#38261593)
there are wifi setups that allow you to do this already.
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Re:Building an occupancy sensor with a $5 ESP32 and a server... by worthless-trash on Tuesday November 14, 2023 @06:35AM (#38262017)
I would like to subscribe to this API.
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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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