ESP32 Pinout Reference: Which GPIO pins should you use? | Random Nerd Tutorials
Unable to use UART pins (Rx/GPIO20) in ESP32-C3-DevKitM-1 when powered with out USB micro cable (IDFGH-9932) · Issue #11227 · espressif/esp-idf · GitHub
UARTs available in ESP32-WROVER-E (and related GPIO pins) (IDFGH-5161) · Issue #6939 · espressif/esp-idf · GitHub