How to Use ESP32 Dev Kit C V2 (38 Pins): Examples, Pinouts, and Specs

Introduction

The ESP32 Dev Kit C V2 is a powerful and versatile development board manufactured by AZ-Delivery. It is based on the ESP32 chip, which integrates Wi-Fi and Bluetooth capabilities, making it ideal for Internet of Things (IoT) applications, smart devices, and rapid prototyping. With 38 GPIO pins, the board offers extensive connectivity options for sensors, actuators, and other peripherals.

Explore Projects Built with ESP32 Dev Kit C V2 (38 Pins)

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!

ESP32 and Logic Level Converter-Based Wi-Fi Controlled Interface

This circuit features an ESP32 Devkit V1 microcontroller connected to a Bi-Directional Logic Level Converter, which facilitates voltage level shifting between the ESP32 and external components. The ESP32 is powered through its VIN pin via an alligator clip cable, and the logic level converter is connected to various pins on the ESP32 to manage different voltage levels for communication.

Open Project in Cirkit Designer

Battery-Powered ESP32 Data Logger with Oscilloscope Monitoring

This circuit features an ESP32 microcontroller powered by a 7V battery, with its ground connected to a common ground. The ESP32's D35 pin is monitored by a mixed signal oscilloscope, and an alligator clip cable is used to connect the oscilloscope's second channel to the common ground.

Open Project in Cirkit Designer

ESP32-Based Wi-Fi Controlled LED System

This circuit features two ESP32 microcontrollers communicating via UART, with one controlling an LED through a resistor. The primary ESP32 (ESP32 38 PINS) handles I2C communication and processes serial input to control the LED, while the secondary ESP32 (pocket esp32-c3) sends periodic data over UART.

Open Project in Cirkit Designer

ESP32-Based Environmental Monitoring System with Water Flow Sensing

This circuit features an ESP32 Devkit V1 microcontroller connected to a DHT22 temperature and humidity sensor and a water flow sensor. The ESP32 reads environmental data from the DHT22 via a digital input pin (D33) and monitors water flow through the water flow sensor connected to another digital input pin (D23). The ESP32 is powered through its VIN pin, and both sensors are powered by the ESP32's 3V3 output, with common ground connections.

Open Project in Cirkit Designer

Common Applications and Use Cases

• IoT devices and smart home automation
• Wireless sensor networks
• Wearable technology
• Robotics and control systems
• Prototyping and educational projects

Technical Specifications

The following table outlines the key technical details of the ESP32 Dev Kit C V2:

Pin Configuration and Descriptions

The ESP32 Dev Kit C V2 has 38 pins, each with specific functions. Below is a summary of the pin configuration:

Note: Some pins have multiple functions. Refer to the ESP32 datasheet for advanced configurations.

Usage Instructions

How to Use the ESP32 Dev Kit C V2 in a Circuit

1. Powering the Board:

   • Connect the board to a computer or USB power supply using a micro-USB cable.
   • Alternatively, supply 5V to the VIN pin and connect GND to ground.

2. Programming the Board:

   • Install the Arduino IDE and add the ESP32 board support package.
   • Select the correct board (ESP32 Dev Module) and COM port in the Arduino IDE.
   • Write or upload your code to the board.

3. Connecting Peripherals:

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

Important Considerations and Best Practices

• Voltage Levels: The ESP32 operates at 3.3V logic. Avoid connecting 5V signals directly to GPIO pins.
• Boot Mode: GPIO0 must be pulled low during boot to enter programming mode.
• Power Supply: Use a stable power source to avoid unexpected resets or malfunctions.
• Deep Sleep Mode: Use deep sleep mode to conserve power in battery-powered applications.

Example Code for Arduino UNO Integration

The following example demonstrates how to blink an LED connected to GPIO2:

// Define the GPIO pin for the LED
#define LED_PIN 2

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

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

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

Tip: Replace LED_PIN with the GPIO number where your LED is connected.

Troubleshooting and FAQs

Common Issues and Solutions

1. Board Not Detected in Arduino IDE:

   • Ensure the correct USB driver is installed for the ESP32.
   • Check the USB cable (some cables only support charging, not data transfer).

2. Upload Fails with "Failed to Connect" Error:

   • Hold the BOOT button on the board while uploading the code.
   • Ensure GPIO0 is pulled low during programming.

3. Wi-Fi Connection Issues:

   • Verify the SSID and password in your code.
   • Check if the Wi-Fi network is within range.

4. Random Resets or Instability:

   • Use a stable power supply with sufficient current (at least 500 mA).
   • Avoid using long or poor-quality USB cables.

FAQs

Q: Can I use 5V sensors with the ESP32?
A: Yes, but you need a level shifter to convert 5V signals to 3.3V.

Q: How do I reset the ESP32?
A: Press the EN button on the board to reset the microcontroller.

Q: Can I use the ESP32 with MicroPython?
A: Yes, the ESP32 supports MicroPython. Flash the MicroPython firmware to get started.

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

For additional support, refer to the official AZ-Delivery documentation or the ESP32 datasheet.