Key Component
Description
Micro USB Port
USB interface. Power supply for the board as well as the communication
interface between a computer and the ESP32-WROOM-32 module.
5V Power On
LED
Turns on when the USB or an external 5V power supply is connected to
the board. For details see the schematics in
I/O
Most of the pins on the ESP module are broken out to the pin headers on
the board. You can program ESP32 to enable multiple functions such as
PWM, ADC, DAC, I2C, I2S, SPI, etc.
Note
The pins D0, D1, D2, D3, CMD and CLK are used internally for communication between
ESP32 and SPI flash memory. They are grouped on both sides near the USB connector.
Avoid using these pins, as it may disrupt access to the SPI flash memory / SPI RAM.
Note
The pins GPIO16 and GPIO17 are available for use only on the boards with the modules
ESP32-WROOM and ESP32-SOLO-1. The boards with ESP32-WROVER modules have
the pins reserved for internal use.
Power Supply Options
There are three mutually exclusive ways to provide power to the board:
•
Micro USB port, default power supply
•
5V / GND header pins
•
3V3 / GND header pins
Warning
The power supply must be provided using one and only one of the options above,
otherwise the board and/or the power supply source can be damaged.
Header Block
The two tables below provide the Name and Function of I/O header pins on both sides
of the board, as shown in
ESP32-DevKitC V4 with ESP32-WROOM-32 module soldered
