PSRAM Pin
The module on the ESP32-S3-WROOM board uses the ESP32-S3R8 chip with 8MB of external Flash. When
we use the OPI PSRAM, please note that the GPIO35-GPIO37 on the ESP32-S3-WROOM board will not be
available for other purposes. When OPI PSRAM is not used, GPIO35-GPIO37 on the board can be used as
normal GPIO.
SDcard Pin
An SDcard slot is integrated on the back of the ESP32-S3-WROOM board. We can use GPIO38-GPIO40 of
ESP32-S3-WROOM to drive SD card.
The SDcard of ESP32-S3-WROOM uses SDMMC, a 1-bit bus driving method, which has been integrated in
the Arduino IDE, and we can call the "SD_MMC.h" library to drive it. For details, see the SDcard chapter in this
tutorial.
USB Pin
In Micropython, GPIO19 and GPIO20 are used for the USB function of ESP32S3, so they cannot be used as
other functions!
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