Show HN: ESPectre – Motion detection based on Wi-Fi spectre analysis

Fun fact: I’m working on turning ESPectre into a Wi‑Fi Theremin (the musical instrument you play by moving your hands near an antenna).

The idea of “playing” by simply moving around a room sounds a bit ridiculous… but also kind of fun.

The key is the Moving Variance of the spatial turbulence: this value is continuous and stable, making it perfect for mapping directly to pitch/frequency, just like the original Theremin. Other features can be mapped to volume and timbre.

It’s pure signal processing, running entirely on the ESP32. Has anyone here experimented with audio synthesis or sonification using real-time signal processing?

Great project and great idea, thank you for sharing !

I don't know if it's useful but one technique I have used in sonification during the experimentation phase is to skip the real time aspect, capture all the available "channels" and generate all the possible permutations of what is mapped where.

Then you can listen to the outputs, see what sounds good, and then test it in real time to check if the musicality is actually a result of the physical interaction and not an artifact or a product of noise.