4-Channel Audio with Rev D2 audio shield

[dthayford]

I searched the forum but didn't find an answer to this question.

It looks like the connection to the I2C address line was removed between Rev D and Rev D2. In that case, how do you communicate with the second audio shield?

Thanks.

[dthayford]

Sorry, just read the note below the schematic for Rev D2 that says the I2C address is not configurable because of the change from 32-pin to 20-pin SGTL5000.

[PaulStoffregen]

You would need to wire the 2nd board's SDA & SCL signals to a different I2C port.

Later in 2023 we'll get the 32 pin chips and start making Rev D again.

[dthayford]

Right, thanks, Paul.
I happen to have an unused Rev D, so I'll use that as the (address + 1) board.

[MichaelMeissner]

If you aren't changing things all that often via I2C, another option is to use an I2C multiplexer. You would have to not connect pins 18/19 directly to the Teensy from the audio shield, and connect each board to a separate I2C setup. I don't recall if the software has the ability to use a 2nd I2C bus or not.

[h4yn0nnym0u5e]

I don't recall if the software has the ability to use a 2nd I2C bus or not.

If my PR https://github.com/PaulStoffregen/Audio/pull/439, posted 2022-06-11, ever gets merged, then it will have…