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Good morning,
I have a project to do to use this board with an emergency call center (voice) the system must be compatible with 4G. But in all the documentation I can't find a way to communicate with AT commands from the ESP32 to the A7670E... Does anyone have an example?
Thank you very much
Hardware connection:
Use UART interface to connect ESP32-S3 and A7670E module (TX, RX, GND).
Software implementation:
Use HardwareSerial library for serial communication.
Send AT commands to control A7670E module.
Sample code:
Initialize serial port and send AT commands (such as AT, ATD<number> to make a call).
Read module response and process it.
Debug:
Check hardware connection and SIM card status.
Use serial monitor to view AT commands and responses.
Common AT commands:
Check signal: AT+CSQ
Make a call: ATD<number>;
Hang up: ATH
Send SMS: AT+CMGS="<number>"
report
Thank you very much for the response.
I've successfully made the call, but I need an external microphone instead of the one included on the board. The board has two solderable terminals marked "mic" (+/- in the photo, marked in red). Using AT commands, I send AT+CSDVC=3 to change the input channel. I've also tried AT+CSDVC=1, but only the internal microphone on the board (marked in brown) works. Any ideas?
Thank you very much.
report
