WASP: A Wi-Fi Sensing platform using bunch of ESP32!!!
I’m basically building a WiFi sensing platform, where you can actually sense the environment using WiFi signals. This technique uses CSI (Channel State Information) to capture how wireless signals bounce, reflect, and change around objects, which can tell you a lot — like where someone is, if they're moving, or even their gestures. (I actually made a research abt this!)
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Timeline
Finally finished my schematics after tons of trial and error, and a bunch of late-night research into RF stuff I barely understood at first 😅 I ended up going with a simple resistive 1-to-8 splitter for the 2.4 GHz WiFi phase signal, and added a bias-tee using a 3.3 nH inductor and 1.5 pF cap to inject DC power cleanly. It’s not the most high-end setup, but it works well for keeping my pcb in sync, hope it'll works well!
Hey guys! a bit update on my project: i’m still working on the schematics, especially on the part where i need to feed a wifi phase reference signal from one source to multiple esp32s to achieve the phase coherence, also working on synchronizing all the esp32s with a shared 40 mhz reference clock.
Currently working on the schematics! Since this is actually my first hardware project, it’s been a bit challenging. But I’m working hard on it and hoping for the best!
