Thank you so much. I just tested GPIO 12 and 14, and they can both act as analog inputs.

Hello DFRobot community,

For anyone who is interested in this topic, I just tested GPIO 12 and GPIO 14. Both of them can function as an analog input. There is no problem with it.

Problem solved.

I would like to add another question: do the AT commands work with Firebeetle ESP32?

I am sorry. I am doing a maker project that is highly area- and weight-constrained. The extension shield is both too large and heavy for me. But I still highly appreciate your comment!

I see. Connect the power pins and the TX/RX pins (4 pins in total). This is super helpful. Thank you so much!