ESP32-DevKitC development board, ESP32-WROOM-32D, 38P

ESP32-DevKitC development board, based on the ESP32 module from Espressif, primarily designed for IoT application development, featuring WiFi and Bluetooth capabilities. This board provides easy access to most I/O pins via side headers, allowing quick connection of various peripherals or mounting on a breadboard.

The board is equipped with the ESP32-WROOM-32D module.

It features a Type C interface used for both power supply and programming through an integrated Silabs CP2102 USB-UART bridge. Dedicated buttons for reset (EN) and boot facilitate firmware uploading to the microcontroller.

Specifications:

Microcontroller: ESP32-WROOM-32D, compatible

Connectivity: Wi-Fi 802.11 b/g/n, Bluetooth (4.2 and BLE)

Programming interface: USB Type-C (shown as MicroUSB in the picture, old version)

USB-UART speed: up to 3 Mbps

I/O pins: most ESP32 pins are exposed on side headers

Number of pins: 38

Power supply: via Type-C port, 5V/GND pins or 3.3V/GND pins (only one at a time!)

Buttons: EN (Reset), BOOT (programming mode)

Power LED: lights up when the board is powered

Breadboard compatibility: yes

Distance between pin rows: 25mm

Pin spacing: 2.54mm

Dimensions: 54.5 x 28mm

Pinout:

First row:

Second row:

Note:

Pins D0–D3, CMD, and CLK are used for communication with the internal SPI flash memory. Using them may lead to instability and should be avoided.

Normally, the board comes without capacitor C15. If the board remains in Download mode or there are problems with the GPIO0 signal, this capacitor is the cause. Check for its presence, located immediately next to the BOOT button, and remove it.

Usage

Hold down the BOOT button while connecting the board to the PC.

Connect the board to the PC using a USB A - Type-C cable. You can release the BOOT button.

Make sure to power the board using only ONE of the available options: Type-C, 5V/GND, or 3.3V/GND.

If programming the board with Arduino IDE, add this URL in File > Preferences, in the Additional Boards Manager URLs field: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json

Multiple URLs can be separated by commas.

Install the ESP32 board by going to Tools > Board > Boards Manager and search for "ESP32". Select "esp32 by Espressif Systems" and click Install.

Select the board and port in Tools > Board, and choose ESP32 Dev Module or ESP32 DevKitC.

In Tools > Port, select the serial port where the board is connected (e.g., COM3).

Write and upload the program, for example:

void setup() {

  Serial.begin(115200);

}

void loop() {

  Serial.println("ESP32 serial test!");

  delay(1000);

}

Press Upload (right arrow).

If the upload does not start, it means the board is not in Boot Mode. Repeat the first step by disconnecting, holding down the BOOT button while connecting the board to the PC.

Open Serial Monitor from Tools > Serial Monitor.

Make sure the baud rate is set to 115200.