Including Optical Audio To The Raspberry Pi With One Chip

Within the residence theater house most individuals would inform you the age of optical audio, identified formally as TOSLINK, is over. Whereas at one time they had been the usual for encompass sound programs, the fiber cables with their glowing purple ideas have now been largely supplanted by the all-in-one capabilities of HDMI on new TVs and audio receivers. However in fact, that doesn’t imply all that TOSLINK-compatible {hardware} that’s within the area merely disappears.

If you happen to’re trying to join a Raspberry Pi to the optical port of your AV system, [Nick Sayer] has you covered. His “TOSLINK Transceiver Hat” makes use of a WM8804 chip from Cirrus Logic to go from the Pi’s I2S audio output to S/PDIF. From there the sign goes straight into the TOSLINK enter and output modules, which have the suitable fiber optic {hardware} and drivers built-in. All you need to do from a software program standpoint is allow a boot overlay meant for a digital-to-analog converter (DAC) from HiFiBerry.

The WM8804 is joined by a handful of passives.

Talking of which, evaluating this challenge with business choices from firms like HiFiBerry is considerably unavoidable. Whereas we will’t say for positive how the straightforward design [Nick] has provide you with compares to costlier (and even cheaper) choices on the business market, clearly going the DIY route all the time nets you further factors right here at Hackaday. Plus, we’ve always been fascinated with projects that sort out this relativity uncommon instance of consumer-grade fiber optic technology.

[Nick] is offering his assembled TOSLINK hat for $40 USD on Tindie, however he’s additionally made all the mandatory recordsdata accessible for anybody who needs to construct one themselves.

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