Bluetooth Handsfree Internal Dac Usage

[theavijitsarkar]

Hi all,

Thanks a lot for a great community and rich support. I have been able to learn a lot and very quickly.
That being said, I am stuck and would really appreciate some guidance.

I am trying to build an esp 32 Bluetooth headset. Basically, this headset will act as a hands free profile, and it will use the internal dac connected to a 3.5 mm head phone using a tip ring ring sleeve connector and will use the pin number 25 and 26 for dac output and 35 for adc. Now the problem is that I went through the example code in classic bluetooth -> hfp_hf. However, I could not find a way to use the internal DAC ADC instead of a i2s. Any pointer should be really helpful. And maybe if you can add a schematic for connecting the trrs, if a resistor and cap is required.