How to Use Adafruit ESP32 Feather V2: Examples, Pinouts, and Specs

The Adafruit ESP32 Feather V2 is a compact and versatile microcontroller board powered by the ESP32 chip. It features built-in Wi-Fi and Bluetooth capabilities, making it an excellent choice for Internet of Things (IoT) projects, wearable devices, and other wireless applications. Designed with the Feather form factor, it is compatible with a wide range of FeatherWing add-ons, enabling easy expansion and customization.

Common applications for the Adafruit ESP32 Feather V2 include:

• IoT devices and smart home automation
• Wearable electronics
• Wireless data logging and monitoring
• Robotics and sensor networks
• Prototyping and development of Bluetooth and Wi-Fi-enabled projects

The Adafruit ESP32 Feather V2 is packed with features to support a variety of applications. Below are its key technical details:

• Microcontroller: ESP32 dual-core processor with Xtensa 32-bit LX6 architecture
• Clock Speed: Up to 240 MHz
• Flash Memory: 8 MB
• PSRAM: 2 MB
• Connectivity: Wi-Fi (802.11 b/g/n) and Bluetooth (v4.2 BR/EDR and BLE)
• Operating Voltage: 3.3V
• Input Voltage: 5V via USB-C or 3.7V via LiPo battery
• GPIO Pins: 20 (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 built-in charging circuit
• Dimensions: 51mm x 23mm x 8mm (2.0" x 0.9" x 0.3")
• Weight: 5.5g

The Adafruit ESP32 Feather V2 has a total of 20 GPIO pins, each with specific functions. Below is the pinout description:

The Adafruit ESP32 Feather V2 is easy to use in a variety of projects. Below are the steps to get started and important considerations:

1. Install the ESP32 Board Package:

   • Open the Arduino IDE.
   • Go to File > Preferences and add the following URL to the "Additional Board Manager URLs" field:
     https://dl.espressif.com/dl/package_esp32_index.json
   • Go to Tools > Board > Boards Manager, search for "ESP32," and install the package.

2. Connect the Board:

   • Use a USB-C cable to connect the Adafruit ESP32 Feather V2 to your computer.
   • Select the correct board (Adafruit ESP32 Feather) and port under the Tools menu in the Arduino IDE.

3. Upload Code:

   • Write or load your Arduino sketch.
   • Click the upload button to program the board.

The following example demonstrates how to blink the onboard LED (connected to GPIO13):

// Blink example for Adafruit ESP32 Feather V2
// This code blinks the onboard LED connected to GPIO13

#define LED_PIN 13  // Define the onboard LED pin

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

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
}

• Power Supply: Ensure the board is powered via USB-C or a 3.7V LiPo battery. Avoid exceeding the voltage limits.
• GPIO Voltage: The GPIO pins operate at 3.3V. Do not apply 5V directly to the pins.
• Wi-Fi and Bluetooth: When using wireless features, ensure proper antenna placement and avoid interference from nearby devices.

1. Board Not Detected in Arduino IDE:

   • Ensure the correct USB driver is installed for the ESP32.
   • Verify the USB-C cable supports data transfer (some cables are power-only).

2. Upload Fails with Timeout Error:

   • Press and hold the BOOT button on the board while uploading the sketch.
   • Release the button once the upload begins.

3. Wi-Fi Connection Issues:

   • Double-check the SSID and password in your code.
   • Ensure the router is within range and supports 2.4 GHz Wi-Fi (ESP32 does not support 5 GHz).

• Q: Can I power the board with a LiPo battery and USB simultaneously?
  A: Yes, the onboard charging circuit will manage the battery charging safely.

• Q: How do I reset the board?
  A: Press the RESET button on the board to restart it.

• Q: Can I use the board with CircuitPython?
  A: Yes, the Adafruit ESP32 Feather V2 supports CircuitPython. Follow Adafruit's guide to install and use CircuitPython on the board.

By following this documentation, you can effectively use the Adafruit ESP32 Feather V2 in your projects. Happy tinkering!