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A comment on Sensorwatch pro – Hackable ARM Cortex M0 brain upgrade for Casio's iconic F-91W.

Re:Sensorwatch pro – Hackable ARM Cortex M0 brain upgrade fo... by hamoid on Thursday September 26, 2024 @11:37AM (#41659634)
See "Chirpy TX/RX": a protocol and implementation for transferring data out of an airgapped device over a piezo buzzer.

https://aka-gabor.xyz/lab/

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