GY PCM5102 not detected

[bassybeats]

Hoping someone can help me. I have got everything working with This Pi hat https://github.com/chris-jh/mt32-pi-midi-hat except I cannot get the DAC output working. It does output to the Pi's headphone jack if I change the config to pwm so I know the rest works fine. (Ignore the flux on the header pins, will clean it off once I get it working )

I have followed these instructions https://github.com/dwhinham/mt32-pi/wiki/GY-PCM5102-DAC-module
But even if I connect the DAC directly to the Pi and run i2cdetect ( to see if it shows the address ) it shows nothing like in the photos. Did I get shipped dud modules or is there something else I am missing? Any help would be appreciated.

[dwhinham]

I'll say the same as in #242: you do not need to set any I2C-related stuff for this DAC, it is not an "intelligent" DAC with software control, so ignore those settings.

i2cdetect will of course report nothing, as this model of DAC does not get wired to the I2C bus. I2C is not involved at any stage; this is for more advanced DACs. Like the wiki page says, all you need to do is set output_device = i2s.

If this does not work, the problem is with either the DAC module, the PCB, or your soldering. Start by testing continuity for each DAC signal pin back to the Pi.

Some fluxes can be conductive and ruin the high-frequency data signals, so clean it all off.

Otherwise, replace the module.

[bassybeats]

Thanks for getting back! Would you say that the I2C settings should be commented out for this module? Its good to know that i2cdetect is expected to show nothing, do you know if there is a way to independently verify those DAC's directly on the Pi without the board/hat? ( I have unsoldered spares ).

I'll go through your suggestions and go from there.
Thanks :)

[dwhinham]

Config settings: you can just leave them at their default values (e.g. i2c_dac_init = none), no need to comment anything out.

You should be able to use it with e.g. Volumio with it set up as if it were a HiFiBerry.

[chris-jh]

I can't add anything else to what Dale has already said.

I will check when i get home the jumper settings on the back of the DAC if they are correct or not. I didn't change them from factory.

[bassybeats]

Thanks both for the help! Turns out that Pin 40 on my GPIO is bad?! tried on a Pi 4b and it works totally fine. Guess my Pi3B+ has an issue. Is there a way to modify the board or code to use a different pin?

[dwhinham]

Not possible, sorry.