How to Use ESP32 Devkit V1: Examples, Pinouts, and Specs

The ESP32 Devkit V1, manufactured by Espressif, is a versatile microcontroller development board based on the ESP32 chip. It features built-in Wi-Fi and Bluetooth capabilities, making it an excellent choice for Internet of Things (IoT) applications, smart devices, and rapid prototyping. With its dual-core processor, low power consumption, and extensive GPIO options, the ESP32 Devkit V1 is suitable for a wide range of projects, from home automation to wearable devices.

• IoT devices and smart home systems
• Wireless sensor networks
• Wearable technology
• Robotics and automation
• Prototyping and educational projects
• Bluetooth Low Energy (BLE) applications

The ESP32 Devkit V1 is built around the ESP32-WROOM-32 module, which integrates a powerful dual-core processor and wireless communication features. Below are the key technical details:

The ESP32 Devkit V1 has a 30-pin layout. Below is a table describing the key pins:

Note: The exact pinout may vary slightly depending on the specific ESP32 Devkit V1 version.

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 connect GND to the ground.

2. Programming the Board:

   • Install the Arduino IDE and add the ESP32 board support package.
   • Select "ESP32 Dev Module" from the Tools > Board menu.
   • Connect the board to your computer and select the appropriate COM port.

3. Connecting Peripherals:

   • Use the GPIO pins 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 environment.
   • Click the upload button to flash the code to the ESP32 Devkit V1.

• Voltage Levels: The GPIO pins operate at 3.3V. Avoid connecting 5V devices directly to the pins without a level shifter.
• Boot Mode: To enter bootloader mode, hold the "BOOT" button while pressing the "EN" button.
• Power Consumption: Use deep sleep mode to minimize power consumption in battery-powered applications.
• Wi-Fi and Bluetooth: Avoid using both Wi-Fi and Bluetooth simultaneously in high-performance modes to reduce power draw.

Below is an example of using the ESP32 Devkit V1 to blink an onboard LED:

// Example: Blink onboard LED on ESP32 Devkit V1

// Define the GPIO pin connected to the onboard LED
#define LED_PIN 2

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
}

Tip: Replace LED_PIN with the appropriate GPIO number if using an external LED.

1. Board Not Detected by Computer:

   • Ensure the USB cable is functional and supports data transfer.
   • Install the correct USB-to-serial driver (e.g., CP2102 or CH340).

2. Code Upload Fails:

   • Check the selected COM port in the Arduino IDE.
   • Hold the "BOOT" button while uploading the code.

3. Wi-Fi Connection Issues:

   • Verify the SSID and password in your code.
   • Ensure the router is within range and supports 2.4 GHz Wi-Fi.

4. GPIO Pin Not Working:

   • Confirm the pin is not reserved for internal functions (e.g., GPIO0, GPIO2).
   • Check for short circuits or incorrect wiring.

Q: Can the ESP32 Devkit V1 run on battery power?
A: Yes, you can power the board using a 3.7V LiPo battery connected to the 3V3 and GND pins, or a 5V source connected to VIN.

Q: How do I reset the ESP32 Devkit V1?
A: Press the "EN" button to reset the board.

Q: Can I use the ESP32 Devkit V1 with MicroPython?
A: Yes, the ESP32 Devkit V1 supports MicroPython. Flash the MicroPython firmware to the board and use a compatible IDE like Thonny.

Q: What is the maximum range of the ESP32's Wi-Fi?
A: The range depends on environmental factors but typically extends up to 100 meters in open spaces.

For additional support, refer to the official Espressif documentation or community forums.