How to Use ESP32 - 38 pins Expansion Board: Examples, Pinouts, and Specs

The ESP32 - 38 Pins Expansion Board is a versatile add-on for the ESP32 microcontroller. It extends the number of available GPIO pins, allowing users to connect more peripherals and sensors. This board is ideal for complex projects that require multiple I/O connections, such as home automation systems, IoT devices, and robotics.

• IoT (Internet of Things) devices
• Home automation
• Robotics
• Complex projects requiring multiple sensor integrations
• Prototyping and educational purposes

• Compatible with ESP32 microcontroller
• Number of Expansion Pins: 38
• Voltage Rating: 3.3V (Do not exceed the voltage rating as it can damage the board)
• Current Rating: Depends on the ESP32 module used

1. Mounting the ESP32: Securely mount the ESP32 onto the expansion board ensuring proper alignment of pins.
2. Power Supply: Connect a 3.3V power supply to the designated VCC and GND pins on the expansion board.
3. Connecting Peripherals: Attach sensors, actuators, or other peripherals to the expansion GPIO pins.
4. Programming: Use the ESP32's programming interface to upload your code.

• Voltage Levels: Ensure that all peripherals are compatible with the 3.3V logic levels of the ESP32.
• Current Draw: Be mindful of the total current draw from the GPIO pins to avoid damaging the ESP32.
• ESD Precautions: Always handle the board with proper electrostatic discharge (ESD) precautions.
• Firmware: Keep the ESP32 firmware updated to the latest version for optimal performance and security.

• Board Not Recognized: Ensure that the ESP32 is properly seated on the expansion board and that your computer recognizes the ESP32 when connected.
• GPIO Malfunction: If a GPIO pin is not functioning as expected, check for soldering issues or shorts on the expansion board.
• Inadequate Power Supply: Insufficient power can cause erratic behavior. Verify that your power supply can handle the load.

• Rebooting: Sometimes, simply resetting the ESP32 can resolve communication issues.
• Firmware Update: Ensure that the ESP32 has the latest firmware installed.
• Check Connections: Double-check all connections, including power and ground, for any loose wires or poor contacts.

• Q: Can I use 5V peripherals with this board?

  • A: No, the ESP32 operates at 3.3V. Use level shifters for interfacing with 5V peripherals.

• Q: How many GPIOs can I use simultaneously?

  • A: All 38 expansion pins can be used, but the total current draw must not exceed the ESP32's specifications.

• Q: Is the expansion board compatible with all ESP32 modules?

  • A: The board is designed to be compatible with standard ESP32 modules. Check the pinout and dimensions of your ESP32 module to ensure compatibility.

// Example Blink Code for ESP32 - 38 Pins Expansion Board
// This code will blink an LED connected to one of the expansion GPIO pins.

#include <Arduino.h>

#define LED_PIN 2 // Define the GPIO pin where the LED is connected

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

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
}

Note: The above code is for illustration purposes. Replace LED_PIN with the actual pin number you are using on the expansion board. Ensure that the ESP32 board definitions are installed in your Arduino IDE and that the correct board and port are selected before uploading the code.