How to Use wt32-eth01: Examples, Pinouts, and Specs

The WT32-ETH01 is a versatile Wi-Fi and Ethernet module that integrates the powerful ESP32 microcontroller with Ethernet capabilities. This module is designed to provide flexible connectivity options, supporting both wireless (Wi-Fi) and wired (Ethernet) communication. Its compact design and robust features make it ideal for a wide range of IoT applications, including smart home devices, industrial automation, and networked sensors.

• IoT devices requiring dual connectivity (Wi-Fi and Ethernet)
• Smart home automation systems
• Industrial control and monitoring
• Networked sensors and data loggers
• Remote device management and firmware updates

• Microcontroller: ESP32 (dual-core, 32-bit, Xtensa LX6)
• Wi-Fi: IEEE 802.11 b/g/n (2.4 GHz)
• Ethernet: 10/100 Mbps via LAN8720A PHY
• Flash Memory: 4 MB
• Operating Voltage: 3.3V
• Power Consumption: ~200 mA (Wi-Fi active)
• GPIO Pins: Configurable via ESP32
• Communication Interfaces: UART, SPI, I2C, PWM, ADC, DAC
• Dimensions: 50 mm x 25 mm

The WT32-ETH01 module has a 2x10 pin header. Below is the pinout and description:

1. Power Supply: Provide a stable 3.3V power supply to the 3V3 pin and connect GND to ground.
2. Programming: Use the UART0 pins (TXD0 and RXD0) to program the ESP32 microcontroller. GPIO0 (IO0) should be pulled low during programming to enter boot mode.
3. Ethernet Connection: Connect the Ethernet cable to the RJ45 port on the module. The Ethernet pins (ETH_TXD0, ETH_TXD1, ETH_RXD0, ETH_RXD1, and ETH_CLK) are internally connected to the LAN8720A PHY.
4. Wi-Fi Configuration: Configure the Wi-Fi settings in your firmware to enable wireless communication.
5. GPIO Usage: Use the available GPIO pins for interfacing with sensors, actuators, or other peripherals.

• Ensure the power supply is clean and stable to avoid unexpected resets or malfunctions.
• Use level shifters if interfacing with 5V logic devices, as the WT32-ETH01 operates at 3.3V logic levels.
• When using Ethernet, ensure the RJ45 connector is properly grounded to reduce noise and improve signal integrity.
• Avoid using GPIO0, GPIO2, and GPIO15 for general-purpose I/O if they are needed for boot or programming modes.

The WT32-ETH01 can be programmed using the Arduino IDE. Below is an example of how to configure the module for Ethernet communication:

#include <ETH.h> // Include the Ethernet library for ESP32

// Define Ethernet configuration
#define ETH_CLK_MODE ETH_CLOCK_GPIO0_IN // Use GPIO0 for Ethernet clock
#define ETH_PHY_POWER 12               // GPIO12 controls Ethernet PHY power

void setup() {
  Serial.begin(115200); // Initialize serial communication
  Serial.println("Initializing Ethernet...");

  // Initialize Ethernet with default settings
  if (!ETH.begin(ETH_PHY_POWER, ETH_CLK_MODE)) {
    Serial.println("Ethernet initialization failed!");
    while (1); // Halt execution if Ethernet fails to initialize
  }

  Serial.println("Ethernet initialized successfully!");
  Serial.print("IP Address: ");
  Serial.println(ETH.localIP()); // Print the assigned IP address
}

void loop() {
  // Main loop can handle other tasks or network communication
}

1. Ethernet Not Working:

   • Ensure the Ethernet cable is securely connected to the RJ45 port.
   • Verify that the Ethernet PHY power pin (default GPIO12) is properly configured in your code.
   • Check the network settings (e.g., DHCP or static IP configuration).

2. Wi-Fi Connection Fails:

   • Double-check the SSID and password in your firmware.
   • Ensure the module is within range of the Wi-Fi router.
   • Verify that the Wi-Fi antenna is properly connected (if external).

3. Module Not Responding:

   • Confirm that the power supply is providing a stable 3.3V.
   • Check the UART connections and ensure the correct baud rate is set in your serial monitor.
   • If programming fails, ensure GPIO0 is pulled low during the boot process.

• Can I use both Wi-Fi and Ethernet simultaneously? Yes, the WT32-ETH01 supports simultaneous use of Wi-Fi and Ethernet, but you may need to manage the network interfaces in your firmware.

• What is the maximum data rate for Ethernet? The module supports up to 100 Mbps Ethernet communication.

• Can I power the module with 5V? No, the WT32-ETH01 requires a 3.3V power supply. Use a voltage regulator if your power source is 5V.

• Is the module compatible with Arduino IDE? Yes, the WT32-ETH01 can be programmed using the Arduino IDE with the appropriate ESP32 board package installed.