ADC (SPK) and DAC (MIC) feature request

[lyusupov]

       Dear LilyGO T-TWR product developer !

Thank you very much for the idea and development of the T-TWR !

This message is actually not an issue report but a minor feature request...

I am not able to see the product schematics but can inspect the picture that was recently published on LilyGO Twitter account:

On this picture I can not see any electronic elements that would prove a statement that MIC and SPEAKER pads of the SA868 module are connected to the ESP32-S3 ADC/DAC ones. So I assume that they are connected directly to the microphone and speaker components only, right?

If this is true - I have a minor design improvement proposal to you: Could you, please, add few circuits to wire MIC and SPEAKER pads of the SA868 module to ADC/DAC pads of the ESP32-S3 ?

There is a great project on GitHub https://github.com/erstec/APRS-ESP that uses both SA868 and ESP32 where:

• ESP32 can supply signal to SA868 (DAC to MIC) and
• ESP32 can read signal from SA868 (SPK to DAC)

This is an excerpt of the schematics that you can use as a reference:

While having this feature available, we can:

• record the received radio signal into 16 Mbytes flash memory of the ESP32-S3 module and/or

• play sound recordings from flash memory and transmit them into the RF air

  Best regards, Linar.

[lbuque]

Hi, Presumably you have received the schematic diagram of T-TWR!

Your idea is great, but whether those functions will be added needs confirmation from the leadership!