How to Use ESP-32 DEVKIT-V1 with Expansion Board: Examples, Pinouts, and Specs

The ESP-32 DEVKIT-V1 with Expansion Board, manufactured by Espressif, is a versatile development board designed for IoT and embedded applications. It features the powerful ESP32 chip, which integrates Wi-Fi and Bluetooth capabilities, making it ideal for wireless communication projects. The included expansion board provides additional GPIO pins, sensor interfaces, and prototyping options, making it a comprehensive solution for developers.

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

1. Powering the Board:

   • Connect the board to a 5V power source via the USB port or the VIN pin.
   • Ensure the power supply provides sufficient current (at least 500 mA).

2. Programming the ESP32:

   • Install the Arduino IDE and add the ESP32 board package via the Board Manager.
   • Select "ESP32 Dev Module" as the board type in the Arduino IDE.
   • Connect the board to your computer using a USB cable and select the appropriate COM port.

3. Connecting Peripherals:

   • Use the GPIO pins on the expansion board 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. Uploading Code:

   • Write your code in the Arduino IDE or another supported development environment.
   • Click the "Upload" button to flash the code to the ESP32.

• Voltage Levels: The ESP32 operates at 3.3V. 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.
• Wi-Fi and Bluetooth: Avoid placing the board near metal objects or enclosures that may interfere with wireless signals.

// Example: Blink an LED connected to GPIO2 on the ESP32
// Ensure the LED is connected with a current-limiting resistor.

#define LED_PIN 2  // GPIO2 is used for the LED

void setup() {
  pinMode(LED_PIN, OUTPUT);  // Set GPIO2 as an output pin
}

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

1. Board Not Detected by Computer:

   • Ensure the USB cable is functional and supports data transfer.
   • Install the correct USB-to-serial driver for the ESP32.

2. Code Upload Fails:

   • Check that GPIO0 is pulled low during programming.
   • Verify the correct COM port and board type are selected in the IDE.

3. Wi-Fi Connection Issues:

   • Ensure the Wi-Fi credentials in your code are correct.
   • Check for interference or weak signal strength.

4. Random Resets or Instability:

   • Use a stable power supply with sufficient current capacity.
   • Avoid excessive power draw from GPIO pins.

Q: Can I use 5V sensors with the ESP32?
A: Yes, but you must use a level shifter to step down the voltage to 3.3V.

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

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