How to Use ESP32-WROOM-32D Development Board: Examples, Pinouts, and Specs

The ESP32-WROOM-32D Development Board by VKTECH is a powerful and versatile microcontroller board designed for a wide range of applications. It features integrated Wi-Fi and Bluetooth capabilities, making it an excellent choice for IoT (Internet of Things) projects, prototyping, and embedded systems development. With its dual-core processor, ample GPIO pins, and support for various communication protocols, the ESP32-WROOM-32D is a go-to solution for developers and hobbyists alike.

• IoT devices and smart home automation
• Wireless sensor networks
• Wearable technology
• Robotics and automation systems
• Prototyping and educational projects
• Data logging and remote monitoring

The ESP32-WROOM-32D Development Board is built around the ESP32-WROOM-32D module, which is based on the ESP32-D0WDQ6 chip. Below are the key technical details:

The ESP32-WROOM-32D Development Board has a total of 38 pins. Below is a table summarizing the key pin functions:

Note: Not all GPIO pins support all functions simultaneously. Refer to the ESP32 datasheet for detailed pin multiplexing information.

1. Powering the Board:

   • Connect the board to a computer or USB power source using a micro-USB cable.
   • Alternatively, supply 5V to the VIN pin and connect GND to the ground.

2. Programming the Board:

   • Install the Arduino IDE and add the ESP32 board support package.
   • Select "ESP32 Dev Module" from the board manager.
   • Connect the board to your computer and upload your code.

3. Connecting Peripherals:

   • Use the GPIO pins to connect sensors, actuators, or other peripherals.
   • Ensure that the voltage levels of connected devices are compatible with the 3.3V logic of the ESP32.

4. Wi-Fi and Bluetooth Setup:

   • Use the built-in libraries (WiFi.h and BluetoothSerial.h) to configure wireless communication.

• Voltage Levels: The GPIO pins operate at 3.3V. Avoid connecting 5V devices directly to the pins without a level shifter.
• Power Supply: Ensure a stable power supply to avoid unexpected resets or performance issues.
• Boot Mode: To enter bootloader mode, hold down the BOOT button while pressing the EN (reset) button.
• Heat Management: The ESP32 can get warm during operation. Ensure proper ventilation if used in enclosed spaces.

Below is an example of how to connect the ESP32-WROOM-32D to a Wi-Fi network and send data to a server:

#include <WiFi.h> // Include the Wi-Fi library

// Replace with your network credentials
const char* ssid = "Your_SSID";
const char* password = "Your_PASSWORD";

void setup() {
  Serial.begin(115200); // Initialize serial communication at 115200 baud
  delay(1000);

  // Connect to Wi-Fi
  Serial.println("Connecting to Wi-Fi...");
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print("."); // Print dots while connecting
  }

  Serial.println("\nWi-Fi connected!");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP()); // Print the assigned IP address
}

void loop() {
  // Add your main code here
}

Tip: Replace Your_SSID and Your_PASSWORD with your Wi-Fi network credentials.

1. Board Not Detected by Computer:

   • Ensure the USB cable is functional and supports data transfer.
   • Install the correct USB-to-serial driver for your operating system.

2. Wi-Fi Connection Fails:

   • Double-check the SSID and password.
   • Ensure the Wi-Fi network is within range and not using unsupported security protocols.

3. Code Upload Fails:

   • Press and hold the BOOT button while uploading the code.
   • Verify that the correct COM port and board type are selected in the Arduino IDE.

4. Random Resets or Instability:

   • Check the power supply for sufficient current (at least 500mA).
   • Avoid using GPIO pins connected to the internal flash during boot.

Q: Can the ESP32-WROOM-32D operate on battery power?
A: Yes, it can be powered using a 3.7V LiPo battery connected to the VIN and GND pins, but ensure proper voltage regulation.

Q: How do I use Bluetooth on the ESP32?
A: Use the BluetoothSerial library to configure and manage Bluetooth communication.

Q: Can I use the ESP32-WROOM-32D with other IDEs?
A: Yes, the ESP32 is compatible with other IDEs like PlatformIO and Espressif's ESP-IDF.

Q: What is the maximum range of the Wi-Fi module?
A: The Wi-Fi range is approximately 50 meters indoors and up to 200 meters outdoors, depending on environmental factors.

For additional support, refer to the official ESP32 documentation or community forums.