Transmit data (and signed transactions / invoices) over the air-waves using DTMF technology.
A project for the 2023 SatsXSouthwest hackathon.
This repository is for reference only.
Bitcoin (and other stuff) transmitted over the radio.
Needs to be able to take text convert to ASCII then into a sound:
https://github.com/escottalexander/simpleTones.js#setup-is-simple
Starting with this: https://github.com/Ravenstine/goertzeljs
Test it out by playing tones and printing boolean whether threshold is exceeded
Here is info on how DTMF (dualtone) works:
http://www.ti.com/lit/an/spra066/spra066.pdf
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