How to Use MH-ET LIVE ESP32 DEVKIT_413a9ac3d3f91af7363ae6c2ec45d054_6_schematic: Examples, Pinouts, and Specs

The MH-ET LIVE ESP32 DEVKIT is a compact and versatile development board based on the ESP32 microcontroller. It is specifically designed for Internet of Things (IoT) applications, offering built-in Wi-Fi and Bluetooth capabilities. This board is equipped with multiple GPIO pins, making it suitable for a wide range of prototyping and development tasks. Its compatibility with various programming environments, such as Arduino IDE, MicroPython, and ESP-IDF, makes it a popular choice among hobbyists and professionals alike.

• IoT devices and smart home automation
• Wireless sensor networks
• Wearable technology
• Robotics and automation systems
• Data logging and remote monitoring
• Prototyping and educational projects

The MH-ET LIVE ESP32 DEVKIT is packed with features that make it a powerful tool for developers. Below are its key technical specifications:

• Microcontroller: ESP32 (dual-core, 32-bit LX6 processor)
• Clock Speed: Up to 240 MHz
• Flash Memory: 4 MB
• SRAM: 520 KB
• Connectivity: Wi-Fi 802.11 b/g/n, Bluetooth 4.2 (Classic and BLE)
• Operating Voltage: 3.3V
• Input Voltage (via USB): 5V
• GPIO Pins: 30 (including ADC, DAC, PWM, I2C, SPI, UART)
• Analog Inputs: 18 channels (12-bit ADC)
• Digital-to-Analog Converter (DAC): 2 channels
• PWM Outputs: Multiple channels
• Dimensions: 51mm x 25.4mm

The MH-ET LIVE ESP32 DEVKIT features a 30-pin layout. Below is the pin configuration:

1. Powering the Board:

   • Connect the board to your computer via a micro-USB cable for power and programming.
   • Alternatively, supply 5V to the VIN pin and connect GND to the ground of your power source.

2. Programming the Board:

   • Install the Arduino IDE or another compatible environment (e.g., MicroPython or ESP-IDF).
   • Add the ESP32 board support package to your IDE.
   • Select "MH-ET LIVE ESP32 DEVKIT" or a similar ESP32 board from the board manager.
   • Write your code and upload it to the board via the USB connection.

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. Using Wi-Fi and Bluetooth:

   • Configure the Wi-Fi or Bluetooth settings in your code to enable wireless communication.
   • Use libraries such as WiFi.h or BluetoothSerial.h in the Arduino IDE for simplified development.

• Voltage Levels: The GPIO pins operate at 3.3V. Avoid applying 5V directly to the pins to prevent damage.
• Boot Mode: Ensure GPIO0 is pulled low during programming to enter boot mode.
• Power Supply: Use a stable power source to avoid unexpected resets or malfunctions.
• Heat Management: The ESP32 can get warm during operation. Ensure proper ventilation if used in enclosed spaces.

The following example demonstrates how to connect the ESP32 to a Wi-Fi network and print the IP address:

#include <WiFi.h> // Include the Wi-Fi library

const char* ssid = "Your_SSID";       // Replace with your Wi-Fi network name
const char* password = "Your_Password"; // Replace with your Wi-Fi password

void setup() {
  Serial.begin(115200); // Initialize serial communication at 115200 baud
  delay(1000);          // Wait for a second to stabilize

  Serial.println("Connecting to Wi-Fi...");
  WiFi.begin(ssid, password); // Start Wi-Fi connection

  while (WiFi.status() != WL_CONNECTED) {
    delay(500); // Wait for connection
    Serial.print(".");
  }

  Serial.println("\nWi-Fi connected!");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP()); // Print the assigned IP address
}

void loop() {
  // Add your main code here
}

1. Board Not Detected by Computer:

   • Ensure the USB cable is functional and supports data transfer.
   • Install the necessary USB-to-serial drivers for the ESP32.

2. Upload Fails with Timeout Error:

   • Check that the correct board and COM port are selected in the IDE.
   • Hold the "BOOT" button on the board while uploading the code.

3. Wi-Fi Connection Fails:

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

4. GPIO Pin Not Working:

   • Confirm that the pin is not being used for another function (e.g., boot mode).
   • Check for short circuits or incorrect wiring.

• Can I power the board with a battery?
  Yes, you can use a 3.7V LiPo battery connected to the 3V3 and GND pins.

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

• Can I use the board with MicroPython?
  Yes, the ESP32 supports MicroPython. Flash the MicroPython firmware to the board to get started.

• How do I reset the board?
  Press the "RST" button or pull the EN pin low to reset the board.