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This user guide shows how to get started with ESP32-DevKitC V4 development board. For description of other versions of the ESP32-DevKitC check :doc:`../hw-reference/index`.
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This user guide shows how to get started with ESP8266-DevKitC development board.
ESP32-DevKitC V4 is a small-sized ESP32-based development board produced by `Espressif <https://espressif.com>`_. Most of the I/O pins are broken out to the pin headers on both sides for easy interfacing. Developers can connect these pins to peripherals as needed. Standard headers also make development easy and convenient when using a breadboard.
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The board supports various ESP32 modules, including :ref:`esp-modules-and-boards-esp32-wroom-32`, :ref:`ESP32-WROOM-32U <esp-modules-and-boards-esp32-wroom-32d-and-u>`, :ref:`ESP32-WROOM-32D <esp-modules-and-boards-esp32-wroom-32d-and-u>` and :ref:`esp-modules-and-boards-esp32-solo-1`.
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ESP8266-DevKitC is a small-sized ESP8266-based development board produced by `Espressif <https://espressif.com>`_. Most of the I/O pins are broken out to the pin headers on both sides for easy interfacing. Developers can connect these pins to peripherals as needed. Standard headers also make development easy and convenient when using a breadboard.
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Functional Description
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The following list and figure below describe key components, interfaces and controls of ESP32-DevKitC V4 board.
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The following list and figure below describe key components, interfaces and controls of ESP8266-DevKitC board.
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ESP-WROOM-02D/U
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Module soldered to the ESP8266-DevKitC board. Optionally ESP-WROOM-02D or ESP-WROOM-02U module may be soldered.
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5V to 3.3V LDO
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A LDO regulator with a maximum current output of 800 mA, which provides power supply for ESP8266 module and user’s peripherals.
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Dial Switch
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A dial switch used for switching between Auto Download and Flow Control.
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* Bit1=OFF, Bit2=ON (Auto Download)
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* Bit1=ON, Bit2=OFF (Flow Control)
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ESP32-WROOM-32
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:ref:`esp-modules-and-boards-esp32-wroom-32` module soldered to the ESP32-DevKitC V4 board. Optionally ESP32-WROOM-32D, ESP32-WROOM-32U or ESP32-SOLO-1 module may be soldered instead of the ESP32-WROOM-32.
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USB-UART Bridge
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A single chip USB-UART bridge provides up to 3 Mbps transfers rates.
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Boot
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Boot Button
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Download button: holding down the **Boot** button and pressing the **EN** button initiates the firmware download mode. Then user can download firmware through the serial port.
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Micro USB Port
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USB interface. It functions as the power supply for the board and the communication interface between PC and the ESP module.
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5V Power On LED
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This LED lights when the USB or an external 5V power supply is applied to the board. For details see schematic in `Related Documents`_.
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EN
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USB interface. It functions as the power supply for the board and the communication interface between PC and the board.
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EN Button
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Reset button: pressing this button resets the system.
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I/O
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Most of the pins on the ESP module are broken out to the pin headers on the board. Users can program ESP32 to enable multiple functions such as PWM, ADC, DAC, I2C, I2S, SPI, etc.
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.. note::
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I/O Connector
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All of the pins on the ESP8266 module are broken out to the pin headers on the board. Users can program ESP8266 to enable multiple functions.
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For details, please refer to `ESP8266EX Datasheet <https://www.espressif.com/sites/default/files/documentation/0a-esp8266ex_datasheet_en.pdf>`_ .
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Some of broken out pins are used internally by the ESP32-WROOM-32, ESP32-WROOM-32D/U and ESP32-SOLO-1 modules to communicate with SPI memory. They are grouped on one side of the board besides the USB connector and labeled CLK, D0, D1, D2, D3 and CMD (GPIO6 - GPIO11). In general these pins should be left unconnected, otherwise access to the SPI flash memory / SPI RAM may be disturbed.
:alt:ESP32-DevKitC V4 with ESP32-WROOM-32 module soldered
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:alt:ESP8266-DevKitC with ESP-WROOM-02D module soldered
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:figclass:align-center
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ESP32-DevKitC V4 with ESP32-WROOM-32 module soldered
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ESP8266-DevKitC with ESP-WROOM-02D module soldered
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Power Supply Options
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Above options are mutually exclusive, i.e. the power supply may be provided using only one of the above options. Attempt to power the board using more than one connection at a time may damage the board and/or the power supply source.
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Note on C15
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The C15, on the board of earlier batches of V4, may bring two issues:
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1. The board may boot into download mode;
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2. If users output clock on GPIO0, C15 may impact the clock output.
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As a result, if users believe that C15 will impact their use of the board, they can remove it completely (please refer to the screenshot below for the precise location of C15 that is colored in yellow). Otherwise, users do not need to concern about C15.
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