Dear Feasycom Support Team,
I am currently developing an audio streaming project using the FSC-BT1114QI module. My goal is to capture audio from analog electret microphones and stream it to LE Audio headsets using the LC3 codec.
My Current Setup:
Module: FSC-BT1114QI
AT+VER: FSC-BT6038A,V1.1.2,20251011
Hardware: Mic circuit implemented according to the datasheet (MIC_BIAS is present and providing 1.9V when streaming).
Configuration: I am using AT+AUXCFG=1 to enable the analog input.
Status: The module successfully enters streaming mode, and the audio is transmitted to the LE Audio receiver.
The Issue:
The transmitted audio volume is extremely low, even with the receiver's volume set to maximum and AT+MICGAIN=10. It appears that by using AT+AUXCFG=1, the module treats the input as Line-In (bypassing the internal preamplifier) rather than Mic-In.
As this is for an assistive listening/environmental monitoring application, I need the high-gain internal microphone preamplifier enabled while streaming LE Audio.
My Questions:
- Is there a specific AT command to force the module into "Mic-In" mode (with the preamplifier active) while keeping the LC3/LE Audio streaming path open?
- Could you provide guidance on how to achieve high-gain microphone input for LE Audio streaming with this module?
Thank you for your assistance.
Best regards,
Eduardo Francés Cerrillo
