ESP-WROVER-KIT

The ESP-WROVER-KIT is a development board for the ESP32 SoC from Espressif, based on a ESP32-WROVER-B module.

../../../../../_images/esp-wrover-kit-v4.1-layout-back.png

ESP-WROVER-KIT board layout - front
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ESP-WROVER-KIT board layout - back

Features

  • ESP32-WROVER-B module

  • LCD screen

  • MicroSD card slot

Its another distinguishing feature is the embedded FTDI FT2232HL chip, an advanced multi-interface USB bridge. This chip enables to use JTAG for direct debugging of ESP32 through the USB interface without a separate JTAG debugger. ESP-WROVER-KIT makes development convenient, easy, and cost-effective.

Most of the ESP32 I/O pins are broken out to the board’s pin headers for easy access.

Serial Console

UART0 is, by default, the serial console. It connects to the on-board FT2232HL converter and is available on the USB connector USB CON8 (J5).

It will show up as /dev/ttyUSB[n] where [n] will probably be 1, since the first interface ([n] == 0) is dedicated to the USB-to-JTAG interface.

Buttons and LEDs

Buttons

There are two buttons labeled Boot and EN. The EN button is not available to software. It pulls the chip enable line that doubles as a reset line.

The BOOT button is connected to IO0. On reset it is used as a strapping pin to determine whether the chip boots normally or into the serial bootloader. After reset, however, the BOOT button can be used for software input.

LEDs

There are several on-board LEDs for that indicate the presence of power and USB activity.

There is an RGB LED available for software.

Pin Mapping

Pin

Signal

Notes

0

RGB LED Red / BOOT Button

2

RGB LED Green

4

RGB LED Blue

5

LCD Backlight

18

LCD Reset

19

LCD Clock

21

LCD D/C

22

LCD CS

23

LCD MOSI

25

LCD MISO

Configurations

nsh

Basic NuttShell configuration (console enabled in UART0, exposed via USB connection by means of FT2232HL converter, at 115200 bps).

wapi

Enables Wi-Fi support.

gpio

This is a test for the GPIO driver. It includes the 3 LEDs and one, arbitrary, GPIO. For this example, GPIO22 was used. At the nsh, we can turn LEDs on and off with the following:

nsh> gpio -o 1 /dev/gpio0
nsh> gpio -o 0 /dev/gpio0

We can use the interrupt pin to send a signal when the interrupt fires:

nsh> gpio -w 14 /dev/gpio2

The pin is configured to as a rising edge interrupt, so after issuing the above command, connect it to 3.3V.

spiflash

This config tests the external SPI that comes with an ESP32 module connected through SPI1.

By default a SmartFS file system is selected. Once booted you can use the following commands to mount the file system:

mksmartfs /dev/smart0
mount -t smartfs /dev/smart0 /mnt

Note that mksmartfs is only needed the first time.

nx

This config adds a set of tests using the graphic examples at apps/example/nx.

This configuration illustrates the use of the LCD with the lower performance SPI interface.

lvgl

This is a demonstration of the LVGL graphics library running on the NuttX LCD driver. You can find LVGL here:

https://www.lvgl.io/
https://github.com/lvgl/lvgl

This configuration uses the LVGL demonstration at apps/examples/lvgldemo.

External devices

BMP180

When using BMP180 (enabling CONFIG_SENSORS_BMP180), it’s expected this device is wired to I2C0 bus.