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Digi+ Pro not playing nice with PoE Hat

Peter Mee

November 22, 2021 15:36

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I have a HiFiBerry Digi+ Pro that's working great with my Pi 3B using Volumio. I have a 7" touchscreen connected, powered from the PI 5v.

I wanted to power this setup using PoE so I bought a HAT (this one). Everything powers up just fine, and the HiFiBerry as recognised as a sound device in the Volumio software, but no sound plays, just a very low volume intermittent digital noise.

Thinking maybe the setup is underpowered from PoE, I disconnected the 7" display. Same issue. I removed PoE and powered the stack with a Pi power brick. Same issue.

It seems that, when the HiFiBerry HAT is connected on top of the PoE HAT, it fails, and it's not looking like a power issue. I'm not finding very much on this issue online, apart from a few (older) success stories.

Any tips on what I could look at next?

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3 comments

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  HiFiBerry team November 22, 2021 15:59

  The Digi+ is designed to connect directly to the Pi. Stuff in between can have all kind of negative effects (e.g. GPIOs that are used by other boards). Therefore, we can't say anything about it. A setup like this is not recommended.

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  Peter Mee November 22, 2021 16:21

  Super fast response. Appreciated!

  So there s no recommended or approved way to run a HiFiBerry setup on PoE?

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  HiFiBerry team November 22, 2021 16:24

  No, there is no recommended way. While some users seem to have this running, we didn't test any specific PoE adapters and we can't guarantee any compatibility with other hardware on the Pi.