Overview

ESP32-DevKitC V4 is a small-sized ESP32-based development board produced by Espressif. Most of the I/O pins are broken out to the pin headers on both sides for easy interfacing. Developers can either connect peripherals with jumper wires or mount ESP32-DevKitC V4 on a breadboard.

To cover a wide range of user requirements, the following versions of ESP32-DevKitC V4 are available:

For details please refer to ESP Product Selector.

Functional Description

The following figure and the table below describe the key components, interfaces and controls of the ESP32-DevKitC V4 board.

ESP32-DevKitC V4 with ESP-WROOM-32 module soldered

ESP32-DevKitC V4 with ESP32-WROOM-32 module soldered

Key Component

Description

ESP32-WROOM-32

A module with ESP32 at its core. For more information, see ESP32-WROOM-32 Datasheet.

EN

Reset button.

Boot

Download button. Holding down Boot and then pressing EN initiates Firmware Download mode for downloading firmware through the serial port.

USB-to-UART Bridge

Single USB-UART bridge chip provides transfer rates of up to 3 Mbps.

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 Related Documents.

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.

Power Supply Options

There are three mutually exclusive ways to provide power to the board:

  • Micro USB port, default power supply

  • 5V and GND header pins

  • 3V3 and 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.

 

No.

Name

Type 1

Function

1

3V3

P

3.3 V power supply

2

EN

I

CHIP_PU, Reset

3

VP

I

GPIO36, ADC1_CH0, S_VP

4

VN

I

GPIO39, ADC1_CH3, S_VN

5

IO34

I

GPIO34, ADC1_CH6, VDET_1

6

IO35

I

GPIO35, ADC1_CH7, VDET_2

7

IO32

I/O

GPIO32, ADC1_CH4, TOUCH_CH9, XTAL_32K_P

8

IO33

I/O

GPIO33, ADC1_CH5, TOUCH_CH8, XTAL_32K_N

9

IO25

I/O

GPIO25, ADC1_CH8, DAC_1

10

IO26

I/O

GPIO26, ADC2_CH9, DAC_2

11

IO27

I/O

GPIO27, ADC2_CH7, TOUCH_CH7

12

IO14

I/O

GPIO14, ADC2_CH6, TOUCH_CH6, MTMS

13

IO12

I/O

GPIO12, ADC2_CH5, TOUCH_CH5, MTDI

14

GND

G

Ground

15

IO13

I/O

GPIO13, ADC2_CH4, TOUCH_CH4, MTCK

16

D2

I/O

GPIO9, D2 2

17

D3

I/O

GPIO10, D3 2

18

CMD

I/O

GPIO11, CMD 2

19

5V

P

5 V power supply

 

No.

Name

Type 1

Function

1

GND

G

Ground

2

IO23

I/O

GPIO23

3

IO22

I/O

GPIO22

4

TX

I/O

GPIO1, U0TXD

5

RX

I/O

GPIO3, U0RXD

6

IO21

I/O

GPIO21

7

GND

G

Ground

8

IO19

I/O

GPIO19

9

IO18

I/O

GPIO18

10

IO5

I/O

GPIO5

11

IO17

I/O

GPIO17 3

12

IO16

I/O

GPIO16 3

13

IO4

I/O

GPIO4, ADC2_CH0, TOUCH_CH0

14

IO0

I/O

GPIO0, ADC2_CH1, TOUCH_CH1, Boot

15

IO2

I/O

GPIO2, ADC2_CH2, TOUCH_CH2

16

IO15

I/O

GPIO15, ADC2_CH3, TOUCH_CH3, MTDO

17

D1

I/O

GPIO8, D1 2

18

D0

I/O

GPIO7, D0 2

19

CLK

I/O

GPIO6, CLK 2
1(1,2)

P: Power supply; I: Input; O: Output.

2(1,2,3,4,5,6)

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.

3(1,2)

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.

Pin Layout

ESP32-DevKitC (click to enlarge)