How to Use ESP32-S3-ETH: Examples, Pinouts, and Specs

The ESP32-S3-ETH is a powerful microcontroller module manufactured by WAVESHARE (Part ID: ESP32-S3-POE-ETH). It features integrated Wi-Fi and Bluetooth capabilities, along with Ethernet support for reliable wired connectivity. This module is designed for high-performance IoT applications, offering robust communication options and advanced processing power.

• IoT Gateways: Acts as a central hub for IoT devices, supporting both wired and wireless communication.
• Industrial Automation: Provides reliable Ethernet connectivity for industrial control systems.
• Smart Home Devices: Enables seamless integration of smart home appliances with cloud services.
• Data Logging and Monitoring: Collects and transmits data over Ethernet or Wi-Fi for real-time monitoring.
• Edge Computing: Processes data locally with its powerful dual-core processor before sending it to the cloud.

1. Powering the Module:

   • Use PoE (Power over Ethernet) for a single-cable solution.
   • Alternatively, supply 5V via the VIN pin or USB-C connector.

2. Connecting to Ethernet:

   • Connect the Ethernet cable to the RJ45 port for wired communication.
   • Ensure the Ethernet network supports 10/100 Mbps speeds.

3. Programming the Module:

   • Use the USB-C port to connect the module to a computer.
   • Install the ESP32-S3 board package in the Arduino IDE or ESP-IDF.
   • Select the correct COM port and board type before uploading code.

4. Using GPIO Pins:

   • Configure GPIO pins as input or output in your code.
   • Use appropriate pull-up or pull-down resistors if required.

5. Wireless Communication:

   • Configure Wi-Fi or Bluetooth settings in your code for wireless connectivity.
   • Ensure proper security protocols (e.g., WPA2) are implemented for Wi-Fi.

• Power Supply: Ensure the module receives a stable 3.3V or 5V power supply.
• Ethernet Shielding: Use shielded Ethernet cables in noisy environments to reduce interference.
• GPIO Voltage Levels: Avoid applying voltages higher than 3.3V to GPIO pins to prevent damage.
• Firmware Updates: Regularly update the firmware to ensure compatibility and security.

Below is an example of how to use the ESP32-S3-ETH with the Arduino IDE to connect to an Ethernet network and send data to a server:

#include <ETH.h> // Include the Ethernet library for ESP32-S3

// Ethernet configuration
#define ETH_CLK_MODE ETH_CLOCK_GPIO17_OUT // Set clock mode
#define ETH_PHY_POWER 12                  // GPIO pin for PHY power

// Network credentials
const char* server = "example.com";       // Server address
const int port = 80;                      // Server port

void setup() {
  Serial.begin(115200);                   // Initialize serial communication
  ETH.begin(ETH_PHY_POWER, ETH_CLK_MODE); // Initialize Ethernet

  // Wait for Ethernet connection
  while (!ETH.linkUp()) {
    Serial.println("Connecting to Ethernet...");
    delay(1000);
  }
  Serial.println("Ethernet connected!");
}

void loop() {
  // Example: Send a GET request to the server
  WiFiClient client;
  if (client.connect(server, port)) {
    client.println("GET / HTTP/1.1");
    client.println("Host: example.com");
    client.println("Connection: close");
    client.println();
    Serial.println("Request sent!");
  } else {
    Serial.println("Connection failed!");
  }
  delay(10000); // Wait 10 seconds before sending the next request
}

1. Ethernet Not Connecting:

   • Ensure the Ethernet cable is securely connected to the RJ45 port.
   • Verify that the network supports 10/100 Mbps speeds.
   • Check if the PoE switch or injector is functioning correctly.

2. Wi-Fi Not Connecting:

   • Double-check the SSID and password in your code.
   • Ensure the Wi-Fi network is within range and not overloaded.

3. Module Not Detected by Computer:

   • Verify the USB-C cable is functional and supports data transfer.
   • Install the correct USB drivers for the ESP32-S3.

4. GPIO Pins Not Working:

   • Confirm the pin mode (input/output) is correctly set in the code.
   • Check for short circuits or incorrect wiring.

• Q: Can I use both Ethernet and Wi-Fi simultaneously?
  A: Yes, the ESP32-S3-ETH supports simultaneous Ethernet and Wi-Fi operation.

• Q: How do I update the firmware?
  A: Use the ESP-IDF or Arduino IDE to upload the latest firmware via the USB-C port.

• Q: What is the maximum Ethernet cable length?
  A: The maximum recommended length is 100 meters (328 feet) for standard Ethernet cables.

• Q: Can I power the module with a battery?
  A: Yes, you can use a 3.7V LiPo battery with a suitable voltage regulator to provide 3.3V.

This concludes the documentation for the ESP32-S3-ETH. For further assistance, refer to the official WAVESHARE datasheet or contact technical support.