How to Use ESP 32 DEVKIT V1 (30 pins): Examples, Pinouts, and Specs

The ESP32 DEVKIT V1 is a versatile development board that harnesses the power of the ESP32 microcontroller. This chip comes with integrated Wi-Fi and Bluetooth capabilities, making it an ideal choice for Internet of Things (IoT) projects. The board's 30 GPIO pins offer a wide range of functionality, from digital and analog I/O to touch sensors, SPI, I2C, and UART communication.

• Smart home devices
• Wireless sensors
• IoT networking
• Bluetooth-based applications
• Low-power device prototypes

• Microcontroller: ESP32
• Operating Voltage: 3.3V
• Input Voltage: 7-12V
• Digital I/O Pins: 30
• Analog Input Pins: 6 (VP, VN, 32, 33, 34, 35)
• Flash Memory: 4MB
• SRAM: 520 KB
• Clock Speed: 240MHz
• Wi-Fi: 802.11 b/g/n
• Bluetooth: v4.2 BR/EDR and BLE

Note: This table is not exhaustive and only includes a selection of pins for brevity.

1. Powering the Board:

   • Connect a 7-12V power supply to the VIN pin and GND, or use the micro USB port for power.

2. Connecting to Wi-Fi:

   • Utilize the onboard Wi-Fi capabilities to connect to a network for IoT applications.

3. Interfacing with Sensors:

   • Connect analog sensors to the ADC pins or digital sensors to the GPIO pins.

4. Programming the Board:

   • Use the Arduino IDE or other development environments to write and upload code to the ESP32.

• Always ensure that the power supply is within the recommended voltage range to prevent damage.
• When using Wi-Fi or Bluetooth, consider the power consumption and plan for power management in battery-operated projects.
• Use proper decoupling capacitors close to the power pins to stabilize the power supply.
• Avoid using pins 6-11 for GPIO as they are connected to the integrated SPI flash and using them may interfere with the operation of the flash memory.

• Board not recognized by the computer:
  • Ensure the micro USB cable is data-capable and the board drivers are installed.
• Wi-Fi or Bluetooth not functioning:
  • Check the antenna connections and ensure the correct configuration in the code.

• If the board does not power on, check the power supply and cable connections.
• For connectivity issues, verify the network credentials and signal strength.
• Use the onboard LED as a simple debugging tool to indicate the status of the board.

• Q: Can I use the ESP32 DEVKIT V1 with a battery?

  • A: Yes, but ensure the battery voltage is within the recommended input range.

• Q: How do I program the ESP32 DEVKIT V1?

  • A: You can program it using the Arduino IDE or other compatible development environments.

• Q: What is the maximum current that the GPIO pins can handle?

  • A: Each GPIO pin can typically source or sink up to 12 mA.

#include <WiFi.h>

// Replace with your network credentials
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

void setup() {
  Serial.begin(115200);
  
  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
}

void loop() {
  // Your code here
}

Note: This example demonstrates how to connect the ESP32 to a Wi-Fi network. Replace your_SSID and your_PASSWORD with your actual Wi-Fi credentials.

Remember to consult the ESP32 datasheet and technical reference manual for more detailed information on the microcontroller's capabilities and the development board's design.