How to Use Vietduino Wifi BLE ESP32: Examples, Pinouts, and Specs

The Vietduino Wifi BLE ESP32 is a versatile microcontroller board designed for a wide range of applications, particularly in the Internet of Things (IoT) domain. Based on the Espressif ESP32 system-on-chip (SoC), it integrates Wi-Fi and Bluetooth Low Energy (BLE) for wireless communication, making it an ideal choice for projects that require remote connectivity and data exchange.

• Smart home devices
• Wireless sensor networks
• IoT gateways
• Wearable electronics
• Remote monitoring and control systems

• Microcontroller: ESP32-D0WDQ6
• Operating Voltage: 3.3V
• Input Voltage (recommended): 5V via micro USB
• Digital I/O Pins: 22
• Analog Input Pins: 6 (ADC 12-bit)
• Analog Output Pins: 2 (DAC 8-bit)
• Flash Memory: 4 MB
• SRAM: 520 KB
• Clock Speed: 240 MHz
• Wi-Fi: 802.11 b/g/n
• Bluetooth: v4.2 BR/EDR and BLE standards

1. Powering the Board: Connect a 5V power supply to the VIN pin or use the micro USB port.
2. Connecting I/O: Utilize the GPIO pins for interfacing with sensors, actuators, and other peripherals.
3. Programming: Use the Arduino IDE or other development environments to upload code to the board.

• Ensure that the input voltage does not exceed the recommended 5V to avoid damaging the board.
• When using Wi-Fi or BLE, consider the power consumption and plan for adequate power supply.
• Use proper decoupling capacitors close to the power pins to minimize noise.
• Avoid drawing more than 12 mA from any GPIO pin.
• For analog readings, ensure that the input voltage range is between 0V and 3.3V.

• Board not responding: Ensure that the board is properly powered and the USB drivers are installed.
• Wi-Fi/BLE not functioning: Check the antenna connections and ensure that the correct libraries are included in the code.

• Reset the board: Press the EN button to reset the board if it becomes unresponsive.
• Update firmware: Make sure the ESP32 board definitions are up to date in the Arduino IDE.
• Check connections: Verify that all connections are secure and correct.

Q: Can I use the Vietduino Wifi BLE ESP32 with the Arduino IDE? A: Yes, the board is compatible with the Arduino IDE. You will need to install the ESP32 board package.

Q: What is the maximum current that can be drawn from the 3.3V pin? A: The maximum current draw from the 3.3V pin should not exceed 500 mA.

Q: How do I enable Bluetooth on the Vietduino Wifi BLE ESP32? A: Bluetooth can be enabled by including the appropriate BLE libraries in your Arduino sketch and initializing the BLE mode in your code.

#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(500);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
}

void loop() {
  // Put your main code here, to run repeatedly:
}

Note: This example demonstrates how to connect the Vietduino Wifi BLE ESP32 to a Wi-Fi network. Make sure to replace your_SSID and your_PASSWORD with your actual Wi-Fi network credentials.