Is there any serial port print when you run the sample code? 3/ What is the LED indicator status?

BT401 does not need to send a command to enter AT mode, you only need to send the corresponding AT command can be, but pay attention to the '\r\n' after the AT command.

The I2C address of this sensor has been solidified and cannot be changed.

This code can implement the OpenAI WebRTC functionality, but it is under the ESP-IDF environment (https://github.com/DFRobot/openai-realtime-embedded-sdk); This example can implement the OpenAI image question-answering functionality and can run under Arduino (https://wiki.dfrobot.com/SKU_DFR1154_ESP32_S3_AI_CAM#target_9). 

My ESP32-S3 also experienced a situation where it couldn't connect to the router. After I set the router's channel to 1 and disabled the 802.11w management frame protection, it was able to connect normally. 

The solution I have found so far is not to have pins D+,D-,D14,A5 connected to the terminal block.

I found the problem.The pins of Firebeetle ESP32-S3 are not D+,D-,D14, or A5, while the pins connected to the Terminal Block Board are 3V3,GND,SCL, and SDA.

Hello, may I ask what kind of project do you want to use the function for?

The CAD file has been updated to the WIKI.

If the serial port keeps connecting and then disconnecting repeatedly, please connect pin 9 to GND and power on again.

If the serial port keeps connecting and then disconnecting repeatedly, please connect pin 9 to GND and power on again.