How to Use ESP32 30pin Expansion Board: Examples, Pinouts, and Specs

The ESP32 30pin Expansion Board is a versatile and user-friendly development board designed to extend the functionality of the ESP32 microcontroller. Manufactured by ESP, this board features 30 pins, providing easy connectivity to a wide range of sensors, modules, and peripherals. It is ideal for rapid prototyping, IoT applications, and embedded systems development.

• Internet of Things (IoT) devices and smart home systems
• Prototyping with sensors and actuators
• Wireless communication projects (Wi-Fi and Bluetooth)
• Robotics and automation systems
• Educational projects and learning platforms

The following table outlines the key technical details of the ESP32 30pin Expansion Board:

The ESP32 30pin Expansion Board features a 30-pin layout. Below is a table describing the pin configuration:

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 GND pin for external power.

2. Programming the Board:

   • Install the ESP32 board package in the Arduino IDE or use the ESP-IDF framework.
   • Select the appropriate board (e.g., "ESP32 Dev Module") in the IDE.
   • Connect the board to your computer via USB and upload your code.

3. Connecting Peripherals:

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

4. Communication Protocols:

   • Use I2C, SPI, or UART pins to interface with external devices.
   • Configure the pins in your code as needed for the specific protocol.

• 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 malfunctions.
• Pin Multiplexing: Some pins have multiple functions (e.g., ADC, PWM, I2C). Configure them carefully in your code to avoid conflicts.
• Deep Sleep Mode: Use deep sleep mode to reduce power consumption in battery-powered applications.

Below is an example of how to blink an LED connected to GPIO2 on the ESP32:

// Example: Blink an LED connected to GPIO2 on the ESP32

// Define the GPIO pin for the LED
const int ledPin = 2;

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

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

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

1. The board is not detected by the computer:

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

2. Upload errors in the Arduino IDE:

   • Check that the correct board and COM port are selected in the IDE.
   • Press and hold the "BOOT" button on the board while uploading the code.

3. Unstable operation or frequent resets:

   • Verify that the power supply is stable and sufficient.
   • Avoid using GPIO pins that are reserved for specific functions (e.g., GPIO0, GPIO2).

4. Wi-Fi or Bluetooth not working:

   • Ensure the antenna is not obstructed.
   • Check the Wi-Fi or Bluetooth configuration in your code.

Q: Can I power the board with a battery?
A: Yes, you can use a 3.7V LiPo battery connected to the VIN and GND pins. Ensure the battery voltage is regulated.

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

Q: Can I use the board with MicroPython?
A: Yes, the ESP32 supports MicroPython. Flash the MicroPython firmware to the board and use a compatible IDE like Thonny.

Q: Are all GPIO pins available for general use?
A: No, some GPIO pins have specific functions or limitations. Refer to the pin configuration table for details.