How to Use ESP32 WROOM devikit: Examples, Pinouts, and Specs

The ESP32 WROOM Devikit by Hoysond is a versatile development board built around the ESP32 WROOM module. It features integrated Wi-Fi and Bluetooth capabilities, making it an excellent choice for Internet of Things (IoT) applications, smart devices, and rapid prototyping. The board is designed to simplify development with the ESP32, offering a compact form factor, multiple GPIO pins, and compatibility with popular development environments like Arduino IDE and ESP-IDF.

• IoT devices and smart home automation
• Wireless sensor networks
• Wearable technology
• Prototyping for Wi-Fi and Bluetooth-enabled projects
• Data logging and remote monitoring systems

The ESP32 WROOM Devikit is packed with features to support a wide range of applications. Below are the key technical specifications:

The ESP32 WROOM Devikit features a 30-pin layout. Below is the pin configuration:

1. Powering the Board:

   • Connect the board to your computer via the micro-USB port for power and programming.
   • Alternatively, supply 5V to the VIN pin and connect GND to the ground of your power source.

2. Programming the Board:

   • Install the necessary drivers for the USB-to-serial chip (e.g., CP2102 or CH340).
   • Use the Arduino IDE or ESP-IDF to write and upload code to the board.
   • Select the correct board and port in your development environment.

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. Boot Mode Selection:

   • To upload code, press and hold the BOOT button while pressing the EN button. Release the EN button first, then the BOOT button.

• Voltage Levels: The GPIO pins operate at 3.3V. Avoid connecting 5V signals directly to the pins to prevent damage.
• Power Supply: Ensure a stable power supply, especially when using Wi-Fi or Bluetooth, as these features can draw significant current.
• Pin Multiplexing: Many pins have multiple functions (e.g., ADC, UART). Check the datasheet to avoid conflicts.
• Heat Management: The ESP32 can get warm during operation. Ensure proper ventilation if used in an enclosed space.

Below is a simple example to connect the ESP32 WROOM Devikit to a Wi-Fi network:

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

const char* ssid = "Your_SSID";       // Replace with your Wi-Fi network name
const char* password = "Your_Password"; // Replace with your Wi-Fi password

void setup() {
  Serial.begin(115200); // Initialize serial communication at 115200 baud
  delay(1000);          // Wait for a second to stabilize

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

  while (WiFi.status() != WL_CONNECTED) {
    delay(500); // Wait for connection
    Serial.print(".");
  }

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

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

1. The board is not detected by the computer:

   • Ensure the correct USB driver (e.g., CP2102 or CH340) is installed.
   • Try a different USB cable or port.

2. Code upload fails:

   • Check that the correct board and port are selected in the IDE.
   • Ensure the board is in boot mode by pressing the BOOT button during upload.

3. Wi-Fi connection issues:

   • Verify the SSID and password in your code.
   • Ensure the router is within range and not blocking the ESP32.

4. GPIO pin not working:

   • Check if the pin is being used for another function (e.g., ADC, UART).
   • Verify that the connected device is compatible with 3.3V logic.

• Can I power the board with a battery?
  Yes, you can use a 3.7V LiPo battery connected to the 3V3 pin or a 5V source to the VIN pin.

• Is the ESP32 WROOM Devikit compatible with Arduino libraries?
  Yes, most Arduino libraries are compatible with the ESP32, but some may require modifications.

• How do I reset the board?
  Press the EN button to reset the board.

• Can I use the ESP32 for Bluetooth audio?
  Yes, the ESP32 supports Bluetooth audio via the A2DP profile, but additional libraries may be required.