Hopefully Hertz

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This project detects periodic motion by analyzing how Wi-Fi signals are disturbed by the environment—hoping to extract 1-second timing.

Ergun PAYAL

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FFT analysis
07/11/2025 at 13:06 • 0 comments

Figure 1 shows the FFT graph when there is no periodic motion in the environment. Peaks can be seen around 0, 1, and 2 Hz, with a magnitude of approximately ~12.

Figure 2 shows the FFT graph generated by rhythmically moving my hand between two ESP32 devices. The magnitude level reaches approximately ~500.

In the video, you can see a live analysis. The rhythmic movement doesn't have to occur directly between the ESP32 devices, but background activity can make it harder to detect.