ESP32 NodeMCU 38 pin

Flash Memory

Get a version with at least 8 MB of flash memory to be able to use OTA updates.

UART0

Do NOT connect a peripheral to UART0 (GPIO1, GPIO3). UART0 is used by the ESP32's bootloader and by the firmware to print messages.

Input-Only Pins

Pins GPIO 34, 35, 36, and 39 are input-only pins and cannot be used as outputs. If you are not sure what that means, do not use these pins at all.

To use this board please refer to the Device Profile called nodemcu_esp32.json or blinkyparts_esp32.json. Both are nicely compatible with the dev board. Open the JSON file with a text editor and have a look at the specific pin numbers.

Schematic

Symbolic View