This ESP32 Antenna Array Can See WiFi

Jeija · 1.2M views · 2025-02-14 · 10:43

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Overview

The creator of ESPARGOS, an ESP32-based antenna array from the University of Stuttgart, explains how it senses phase and amplitude of WiFi signals to localize devices and build a WiFi camera. It demos the Python library and project.

On Hacker News

Recommended as the companion explanation to the Espargos project, showing how phase and time differences localize devices.

Recommended by 1 HN people across 1 months · HN mentions 2025–2026

Topics

Embedded systems & DIY electronics Electronics & circuit design Networking & internet infrastructure

What people said

leoedin · 2025-02 · Recommendation
This project uses an array of ESP32s and some clever calibration techniques to do pretty accurate localisation of WiFi signals. There's an excellent companion video here: [VIDEO]
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alter_igel · 2026-03 · Reference
Author here. I agree with you, "full spectrum" is a generous marketing phrase for what might more accurately be called _extended_ spectrum. People way smarter than me have been able to achieve DIY spatial imaging with x-rays via compressed sensing [1] and with microwaves via phased arrays [2]. Optical wavelengths seem to be at a sweet spot of good angular resolution, varied natural sources, and harmless to humans. [1] [LINK] [2] [VIDEO]
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rubatuga · 2026-02 · Reference
I was really impressed that a ESP32 Antenna Array Can essentially make a WiFi camera - it uses both time and phase differences to localize based on MAC addresses (which are sent plaintext) [VIDEO]
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Video by Jeija, played through YouTube.

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