User Elehobica on GitHub has made a clever project using a Raspberry Pi Pico / Pico W.
spdif_recorder can record high resolution digital audio from S/PDIF Coaxial or TOSLINK connections (coaxial or optical) to WAV files.
16bit or 24bit (2 channel) can be recorded at sampling frequencies of 44.1 KHz, 48.0 KHz, 88.2 KHz, 96.0 KHz (, 176.4 KHz, 192 KHz).
The Pico is controlled via a simple serial interface. Time is recorded when using a Pico W.
Check out the details on GitHub.
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