How to Use Esp32 Feather v2: Examples, Pinouts, and Specs

The ESP32 Feather v2 by Adafruit is a compact and versatile microcontroller board designed for IoT (Internet of Things) applications. It features a powerful dual-core ESP32 processor with integrated Wi-Fi and Bluetooth capabilities, making it ideal for wireless communication and smart device projects. The board is part of Adafruit's Feather ecosystem, ensuring compatibility with a wide range of FeatherWing add-ons for extended functionality.

• IoT devices and smart home automation
• Wireless sensor networks
• Wearable technology
• Robotics and automation
• Prototyping and development of connected devices
• Data logging and remote monitoring

The ESP32 Feather v2 is packed with features to support a variety of applications. Below are its key technical details:

• Processor: ESP32 dual-core Xtensa LX6 @ 240 MHz
• Wireless Connectivity: Wi-Fi (802.11 b/g/n) and Bluetooth (v4.2 BR/EDR + BLE)
• Flash Memory: 8 MB
• PSRAM: 2 MB
• Operating Voltage: 3.3V
• Input Voltage: 5V via USB-C or LiPo battery
• GPIO Pins: 21 (including ADC, DAC, I2C, SPI, UART, PWM)
• USB Interface: USB-C for programming and power
• Battery Support: JST connector for 3.7V LiPo batteries with charging circuit
• Dimensions: 51mm x 23mm x 8mm
• Weight: 5.5g

The ESP32 Feather v2 has a rich set of GPIO pins, each with multiple functions. Below is the pinout description:

The ESP32 Feather v2 is easy to use and highly adaptable for various projects. Below are the steps and best practices for using the board:

1. Powering the Board:

   • Connect a USB-C cable to power the board and upload code.
   • Alternatively, connect a 3.7V LiPo battery to the JST connector for portable applications.

2. Programming the Board:

   • Install the Arduino IDE and add the ESP32 board support package.
   • Select "Adafruit ESP32 Feather" as the board in the Arduino IDE.
   • Connect the board to your computer via USB-C and upload your code.

3. Connecting Peripherals:

   • Use the GPIO pins to connect sensors, actuators, or other modules.
   • Ensure peripherals operate at 3.3V logic levels to avoid damaging the board.

4. Wireless Communication:

   • Use the built-in Wi-Fi and Bluetooth capabilities for wireless communication.
   • Libraries such as WiFi.h and BluetoothSerial.h can simplify development.

• Voltage Levels: Ensure all connected peripherals operate at 3.3V logic levels.
• Battery Charging: The onboard charging circuit supports 3.7V LiPo batteries. Do not exceed the recommended battery voltage.
• Pin Multiplexing: Some GPIO pins have multiple functions (e.g., ADC, PWM). Refer to the pinout table to avoid conflicts.
• Heat Management: The ESP32 can get warm during operation. Ensure proper ventilation if used in enclosed spaces.

Below is an example of how to connect the ESP32 Feather v2 to a Wi-Fi network and blink an LED:

#include <WiFi.h> // Include the Wi-Fi library

// Replace with your network credentials
const char* ssid = "Your_SSID";
const char* password = "Your_PASSWORD";

void setup() {
  pinMode(13, OUTPUT); // Set GPIO13 as an output for the onboard LED
  Serial.begin(115200); // Start serial communication at 115200 baud

  // Connect to Wi-Fi
  Serial.print("Connecting to Wi-Fi");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWi-Fi connected!");
}

void loop() {
  digitalWrite(13, HIGH); // Turn the LED on
  delay(1000);            // Wait for 1 second
  digitalWrite(13, LOW);  // Turn the LED off
  delay(1000);            // Wait for 1 second
}

1. Board Not Detected by Computer:

   • Ensure the USB-C cable is data-capable (not just for charging).
   • Check that the correct COM port is selected in the Arduino IDE.

2. Code Upload Fails:

   • Press and hold the BOOT button while uploading code to enter bootloader mode.
   • Verify that the correct board and port are selected in the Arduino IDE.

3. Wi-Fi Connection Issues:

   • Double-check the SSID and password in your code.
   • Ensure the Wi-Fi network is within range and not restricted.

4. Overheating:

   • Avoid running the ESP32 at maximum load for extended periods.
   • Use a heat sink or ensure proper ventilation if necessary.

• Q: Can I use 5V peripherals with the ESP32 Feather v2?
  A: No, the ESP32 operates at 3.3V logic levels. Use a level shifter for 5V peripherals.

• Q: How do I monitor battery voltage?
  A: Use the BAT pin to measure the battery voltage with an ADC pin.

• Q: Can I use the ESP32 Feather v2 with CircuitPython?
  A: Yes, the board supports CircuitPython. Follow Adafruit's guide to install and use CircuitPython.

• 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.

This concludes the documentation for the ESP32 Feather v2. For additional support, visit the Adafruit website.