How to Use ESP 32 Wroom Dev Kit: Examples, Pinouts, and Specs

The ESP32-WROOM Dev Kit is a powerful, versatile development board that integrates the ESP32-WROOM-32 module. This board is widely used for Internet of Things (IoT) applications due to its built-in Wi-Fi and Bluetooth capabilities. It is suitable for a variety of uses, including smart home devices, wireless sensors, and other connected projects.

• Microcontroller: ESP32-D0WDQ6
• Operating Voltage: 3.3V
• Input Voltage: 5V via micro USB or Vin pin
• Digital I/O Pins: 22
• Analog Input Pins: 6 (VP, VN, 32, 33, 34, 35)
• Flash Memory: 4MB
• SRAM: 520 KB
• Clock Speed: Up to 240MHz
• Wi-Fi: 802.11 b/g/n
• Bluetooth: v4.2 BR/EDR and BLE
• Operating Temperature: -40°C to +125°C

To use the ESP32-WROOM Dev Kit in a circuit:

1. Powering the Board: Connect a 5V power supply to the micro USB port or Vin pin.
2. Connecting I/O Pins: Utilize the GPIO pins for interfacing with sensors, actuators, and other peripherals.
3. Programming the Board: Use the micro USB port to connect the board to a computer for programming.

• Power Supply: Ensure that the power supply is stable and within the specified voltage range to prevent damage.
• I/O Pin Protection: Use current-limiting resistors to protect the GPIO pins from overcurrent conditions.
• Antenna Clearance: Keep the area around the antenna free from metal objects to ensure proper Wi-Fi and Bluetooth signal propagation.
• ESD Precautions: Handle the board with proper electrostatic discharge (ESD) precautions to avoid damaging the sensitive electronics.

• Board Not Powering Up: Check the power supply and cable connections. Ensure the EN pin is not being held low.
• Failure to Connect to Wi-Fi: Verify the Wi-Fi credentials and signal strength. Ensure the antenna area is clear of obstructions.
• Programming Errors: Ensure the correct board settings are selected in the IDE and the drivers are installed.

• Q: Can I use the ESP32-WROOM Dev Kit with Arduino IDE?

  • A: Yes, the board is compatible with the Arduino IDE. You will need to install the ESP32 board package.

• Q: What is the maximum current draw for the I/O pins?

  • A: The maximum current per I/O pin is 12 mA.

• Q: How do I reset the board?

  • A: Briefly connect the EN pin to GND or press the reset button if available.

Below is a simple example of how to blink an LED connected to the ESP32-WROOM Dev Kit using the Arduino IDE.

// Define the LED pin
const int LED_PIN = 2; // Use GPIO2 for the LED

// Setup function runs once at the start
void setup() {
  // Initialize the LED pin as an output
  pinMode(LED_PIN, OUTPUT);
}

// Loop function runs repeatedly
void loop() {
  digitalWrite(LED_PIN, HIGH); // Turn the LED on
  delay(1000);                // Wait for a second
  digitalWrite(LED_PIN, LOW);  // Turn the LED off
  delay(1000);                // Wait for a second
}

Remember to select the correct board and port in the Arduino IDE before uploading the code to the ESP32-WROOM Dev Kit.