Spresense wireless audio tranmission

[Larry]

I found the Bluetooth audio transmitter board here: https://www.aliexpress.com/item/33058710334.html?aff_fcid=7298fabbab994f968c8ced997ff948a9-1679611909534-04823-_9iRqhc&tt=CPS_NORMAL&aff_fsk=_9iRqhc&aff_platform=shareComponent-detail&sk=_9iRqhc&aff_trace_key=7298fabbab994f968c8ced997ff948a9-1679611909534-04823-_9iRqhc&terminal_id=ec7ff5f69e95414ca80351c676811549&afSmartRedirect=y
I hope to use this board to transmit audio to a Bluetooth speaker for playing audio wirelessly. I have the following 2 questions.

1. Does Spresense has necessary pins for using this board if I hope to play the SD card music (similar to the existing audio player example)?
2. To be more advanced, is it possible that I can play what recorded from the board (with connected microphones) ? I am still waiting for the answer to whether the audio recorder mode and audio player mode can be enabled at the same time.

Thank you in advance for any help

Larry

[CamilaSouza]

Hello, @Larry

I never used a board like this, but I was watching this video:
https://www.youtube.com/watch?v=ZQ5MWcis8rA

1. It seems that you would need RX and TX pins, which spresense has, and then the channel L and R pins, which are the ones that go to the headphone jack.
   I'm thinking you might have to remove the headphone jack to have access to the pins.

2. I think if you are on the through mode, than you would be able to record and send directly to the output and then feed to this board.

But again, I have never tried anything like this.

About the recorder and player modes.
Documentation describes it as a state machine with three modes: Player, Recorder and Through.

This leads me to believe that you can switch between them, but you need to be in only one at a time.
More information about each mode can be found here:
https://developer.sony.com/develop/spresense/docs/arduino_developer_guide_en.html#_about_high_level_interface

[Larry]

@CamilaSouza Hi Camila, Thank you so much for your kind reply. For the second question, switching between two modes is unacceptable to me as I may lose some input in this way. Thanks again for your reply. I may looking into other solutions to my project.

[CamilaSouza]

Hi @Larry
I have good news.

I the next SDK release it will be possible to use the two modes at the same time

[Larry]

@CamilaSouza Hi Camila, Thank you so much for your information. If possible, I hope there will be an example of enabling two modes at the same time in Arduino when the SDK released. If convenient, please let me know when this SDK releases. Thanks!