How to Use ESP32 Dev Kit C V2 (38 Pins): Examples, Pinouts, and Specs

The ESP32 Dev Kit C V2 is a powerful and versatile development board manufactured by AZ-Delivery. It is based on the ESP32 chip, which integrates Wi-Fi and Bluetooth capabilities, making it ideal for Internet of Things (IoT) applications, smart devices, and rapid prototyping. With 38 GPIO pins, the board offers extensive connectivity options for sensors, actuators, and other peripherals.

• IoT devices and smart home automation
• Wireless sensor networks
• Wearable technology
• Robotics and control systems
• Prototyping and educational projects

The following table outlines the key technical details of the ESP32 Dev Kit C V2:

The ESP32 Dev Kit C V2 has 38 pins, each with specific functions. Below is a summary of the pin configuration:

Note: Some pins have multiple functions. Refer to the ESP32 datasheet for advanced configurations.

1. Powering the Board:

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

2. Programming the Board:

   • Install the Arduino IDE and add the ESP32 board support package.
   • Select the correct board (ESP32 Dev Module) and COM port in the Arduino IDE.
   • Write or upload your code to the board.

3. Connecting Peripherals:

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

• Voltage Levels: The ESP32 operates at 3.3V logic. Avoid connecting 5V signals directly to GPIO pins.
• Boot Mode: GPIO0 must be pulled low during boot to enter programming mode.
• Power Supply: Use a stable power source to avoid unexpected resets or malfunctions.
• Deep Sleep Mode: Use deep sleep mode to conserve power in battery-powered applications.

The following example demonstrates how to blink an LED connected to GPIO2:

// Define the GPIO pin for the LED
#define LED_PIN 2

void setup() {
  // Set the LED pin as an output
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  // Turn the LED on
  digitalWrite(LED_PIN, HIGH);
  delay(1000); // Wait for 1 second

  // Turn the LED off
  digitalWrite(LED_PIN, LOW);
  delay(1000); // Wait for 1 second
}

Tip: Replace LED_PIN with the GPIO number where your LED is connected.

1. Board Not Detected in Arduino IDE:

   • Ensure the correct USB driver is installed for the ESP32.
   • Check the USB cable (some cables only support charging, not data transfer).

2. Upload Fails with "Failed to Connect" Error:

   • Hold the BOOT button on the board while uploading the code.
   • Ensure GPIO0 is pulled low during programming.

3. Wi-Fi Connection Issues:

   • Verify the SSID and password in your code.
   • Check if the Wi-Fi network is within range.

4. Random Resets or Instability:

   • Use a stable power supply with sufficient current (at least 500 mA).
   • Avoid using long or poor-quality USB cables.

Q: Can I use 5V sensors with the ESP32?
A: Yes, but you need a level shifter to convert 5V signals to 3.3V.

Q: How do I reset the ESP32?
A: Press the EN button on the board to reset the microcontroller.

Q: Can I use the ESP32 with MicroPython?
A: Yes, the ESP32 supports MicroPython. Flash the MicroPython firmware to get started.

Q: What is the maximum current output of the 3.3V pin?
A: The 3.3V pin can supply up to 500 mA, depending on the input power source.

For additional support, refer to the official AZ-Delivery documentation or the ESP32 datasheet.