Show HN: Communication Without Networks – Just Light and Sound (Spectra)

We built SPECTRA — a system for transmitting real digital data, camouflaged as natural sounds and optical phenomena.

No Wi-Fi, no GSM, no internet. Just binary or ternary encoded signals hidden in what looks like environmental noise: bird chirps, light flickering, wind-like modulations.

Instead of obvious radio signals, SPECTRA uses:

Acoustic masking: frequency-shifted codes embedded in naturally sounding audio patterns.

Optical masking: binary or RGB ternary codes transmitted through LEDs and lasers, camouflaged as normal light variations.

The goal: create a resilient, stealthy communication system that can survive when conventional networks fail or are under surveillance.

Inspiration came from how native tribes imitated birds to send messages — now reimagined with embedded microcontrollers and dynamic adaptation.

We combined optical + acoustic transmission to boost survivability under different environmental conditions.

Early prototype and more details: https://alexs749266.github.io/SPECTRA-Communication/

Happy to hear any thoughts or hack ideas!