ESP-WROVER-KIT V3 Getting Started Guide

This user guide shows how to get started with ESP-WROVER-KIT V3 development board including description of its functionality and configuration options. You can find out what version you have in section ESP-WROVER-KIT.

If you like to start using this board right now, go directly to section Start Application Development.

What You Need

  • 1 × ESP-WROVER-KIT V3 board
  • 1 x Micro USB 2.0 Cable, Type A to Micro B
  • 1 × PC loaded with Windows, Linux or Mac OS

Overview

The ESP-WROVER-KIT is a development board produced by Espressif built around ESP32. This board is compatible with ESP32 modules, including the ESP-WROOM-32 and ESP32-WROVER. The ESP-WROVER-KIT features support for an LCD and MicroSD card. The I/O pins have been broken out from the ESP32 module for easy extension. The board carries an advanced multi-protocol USB bridge (the FTDI FT2232HL), enabling developers to use JTAG directly to debug the ESP32 through the USB interface. The development board makes secondary development easy and cost-effective.

Note

ESP-WROVER-KIT V3 integrates the ESP32-WROVER module by default.

Functionality Overview

Block diagram below presents main components of ESP-WROVER-KIT and interconnections between components.

ESP-WROVER-KIT block diagram

ESP-WROVER-KIT block diagram

Functional Description

The following list and figures below describe key components, interfaces and controls of ESP-WROVER-KIT board.

32.768 kHz
An external precision 32.768 kHz crystal oscillator provides the chip with a clock of low-power consumption during the Deep-sleep mode.
0R
A zero Ohm resistor intended as a placeholder for a current shunt. May be desoldered or replaced with a current shunt to facilitate measurement of current required by ESP32 module depending on power mode.
ESP32 Module

ESP-WROVER-KIT is compatible with both ESP-WROOM-32 and ESP32-WROVER. The ESP32-WROVER module features all the functions of ESP-WROOM-32 and integrates an external 32-MBit PSRAM for flexible extended storage and data processing capabilities.

Note

GPIO16 and GPIO17 are used as the CS and clock signal for PSRAM. To ensure reliable performance, the two GPIOs are not broken out.

FT2232
The FT2232 chip is a multi-protocol USB-to-serial bridge. Users can control and program the FT2232 chip through the USB interface to establish communication with ESP32. The FT2232 chip also features USB-to-JTAG interface. USB-to-JTAG is available on channel A of FT2232, USB-to-serial on channel B. The embedded FT2232 chip is one of the distinguishing features of the ESPWROVER-KIT. It enhances users’ convenience in terms of application development and debugging. In addition, users do not need to buy a JTAG debugger separately, which reduces the development cost, see ESP-WROVER-KIT V3 schematic.
UART
Serial port: the serial TX/RX signals on FT2232HL and ESP32 are broken out to the two sides of JP11. By default, the two signals are connected with jumpers. To use the ESP32 module serial interface only, the jumpers may be removed and the module can be connected to another external serial device.
SPI
SPI interface: the SPI interface connects to an external flash (PSRAM). To interface another SPI device, an extra CS signal is needed. The electrical level on the flash of this module is 1.8V. If an ESP-WROOM-32 is being used, please note that the electrical level on the flash of this module is 3.3V.
CTS/RTS
Serial port flow control signals: the pins are not connected to the circuitry by default. To enable them, respective pins of JP14 must be shorted with jumpers.
JTAG
JTAG interface: the JTAG signals on FT2232HL and ESP32 are broken out to the two sides of JP8. By default, the two signals are disconnected. To enable JTAG, shorting jumpers are required on the signals.
EN
Reset button: pressing this button resets the system.
Boot
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.
USB
USB interface. It functions as the power supply for the board and the communication interface between PC and ESP32 module.
Power Select
Power supply selection interface: the ESP-WROVER-KIT can be powered through the USB interface or the 5V Input interface. The user can select the power supply with a jumper. More details can be found in section Setup Options, jumper header JP7.
Power Key
Power on/off button: toggling to the right powers the board on; toggling to the left powers the board off.
5V Input
The 5V power supply interface is used as a backup power supply in case of full-load operation.
LDO
NCP1117(1A). 5V-to-3.3V LDO. (There is an alternative pin-compatible LDO — LM317DCY, with an output current of up to 1.5A). NCP1117 can provide a maximum current of 1A. The LDO solutions are available with both fixed output voltage and variable output voltage. For details please refer to ESP-WROVER-KIT V3 schematic.
Camera
Camera interface: a standard OV7670 camera module is supported.
RGB
Red, green and blue (RGB) light emitting diodes (LEDs), which may be controlled by pulse width modulation (PWM).
I/O
All the pins on the ESP32 module are led out to the pin headers on the ESPWROVER-KIT. Users can program ESP32 to enable multiple functions such as PWM, ADC, DAC, I2C, I2S, SPI, etc.
Micro SD Card
Micro SD card slot for data storage.
LCD
ESP-WROVER-KIT supports mounting and interfacing a 3.2” SPI (standard 4-wire Serial Peripheral Interface) LCD, as shown on figure ESP-WROVER-KIT board layout - back.
ESP-WROVER-KIT board layout - front

ESP-WROVER-KIT board layout - front

ESP-WROVER-KIT board layout - back

ESP-WROVER-KIT board layout - back

Setup Options

There are five jumper headers available to set up the board functionality. Typical options to select from are listed in table below.

Header Jumper Setting Description of Functionality
JP7 jp7-ext_5v Power ESP-WROVER-KIT board from an external power supply
JP7 jp7-usb_5v Power ESP-WROVER-KIT board from an USB port
JP8 jp8 Enable JTAG functionality
JP11 jp11-rx-tx Enable UART communication
JP14 jp14 Enable RTS/CTS flow control for serial communication

Allocation of ESP32 Pins

Several pins / terminals of ESP32 module are allocated to the on board hardware. Some of them, like GPIO0 or GPIO2, have multiple functions. If certain hardware is not installed, e.g. nothing is plugged in to the Camera / JP4 header, then selected GPIOs may be used for other purposes.

32.768 kHz Oscillator

  ESP32 Pin
1 GPIO32
2 GPIO33

Note

As GPIO32 and GPIO33 are connected to the oscillator, to maintain signal integrity, they are not connected to JP1 I/O expansion connector. This allocation may be changed from oscillator to JP1 by desoldering 0R resistors from positions R11 / R23 and installing them in positions R12 / R24.

SPI Flash / JP13

  ESP32 Pin
1 CLK / GPIO6
2 SD0 / GPIO7
3 SD1 / GPIO8
4 SD2 / GPIO9
5 SD3 / GPIO10
6 CMD / GPIO11

JTAG / JP8

  ESP32 Pin JTAG Signal
1 CHIP_PU TRST_N
2 MTDO / GPIO15 TDO
3 MTDI / GPIO12 TDI
4 MTCK / GPIO13 TCK
5 MTMS / GPIO14 TMS

Camera / JP4

  ESP32 Pin Camera Signal
1 GPIO27 SCCB Clock
2 GPIO26 SCCB Data
3 GPIO21 System Clock
4 GPIO25 Vertical Sync
5 GPIO23 Horizontal Reference
6 GPIO22 Pixel Clock
7 GPIO4 Pixel Data Bit 0
8 GPIO5 Pixel Data Bit 1
9 GPIO18 Pixel Data Bit 2
10 GPIO19 Pixel Data Bit 3
11 GPIO36 Pixel Data Bit 4
11 GPIO39 Pixel Data Bit 5
11 GPIO34 Pixel Data Bit 6
11 GPIO35 Pixel Data Bit 7
11 GPIO2 Camera Reset

RGB LED

  ESP32 Pin RGB LED
1 GPIO0 Red
2 GPIO2 Blue
3 GPIO4 Green

MicroSD Card / J4

  ESP32 Pin MicroSD Signal
1 MTDI / GPIO12 DATA2
2 MTCK / GPIO13 CD / DATA3
3 MTDO / GPIO15 CMD
4 MTMS / GPIO14 CLK
5 GPIO2 DATA0
6 GPIO4 DATA1
7 GPIO21 CD

LCD / U5

  ESP32 Pin LCD Signal
1 GPIO18 RESET
2 GPIO19 SCL
3 GPIO21 D/C
4 GPIO22 CS
5 GPIO23 SDA
6 GPIO25 SDO
7 GPIO5 Backlight

Start Application Development

Before powering up the ESP-WROVER-KIT, please make sure that the board has been received in good condition with no obvious signs of damage.

Initial Setup

Select the source of power supply for the board by setting jumper JP7. The options are either USB port or an external power supply. For this application selection of USB port is sufficient. Enable UART communication by installing jumpers on JP11. Both selections are shown in table below.

Power up from USB port Enable UART communication
jp7-usb_5v jp11-rx-tx

Do not install any other jumpers.

Now to Development

To start development of applications for ESP-WROVER-KIT, proceed to section Get Started, that will walk you through the following steps:

  • Setup Toolchain in your PC to develop applications for ESP32 in C language
  • Connect the module to the PC and verify if it is accessible
  • Build and Flash an example application to the ESP32
  • Monitor instantly what the application is doing