It’s true, you can actually see WiFi when using this homemade ESP32 antenna array by Jeija. Technically speaking, it consists of eight ESP32-S2FH4 microcontrollers and eight 2.4 GHz WiFi patch antennas placed a half-wavelength apart in two dimensions.
The ESP32s are then used to extract channel state information (CSI) from each packet they receive, transmitting it on to the controller board where another microcontroller streams them over Ethernet while providing the clock and phase reference signals needed to make the phased array work. This enables one to calculate where a signal is coming from and its strength. The data can be used to plot heat map-like overlay on a webcam image of the same scene.
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This is absolutely incredible. My brother and I were talking about a similar concept but for ham radio VHF, and I guess it only just occurred to me that the ‘eyes’ you’d have to build would be absurdly enormous to achieve the fidelity you did here. This project is amazing,” said one commenter.
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