How to Use the USR-ES1 W5500 Ethernet Module with Arduino

The USR-ES1 is a W5500-based Ethernet module that allows Arduino projects to connect to the internet via a wired connection. It’s compact, reliable, and supports TCP/IP protocols, making it perfect for IoT applications, web servers, and data logging. This tutorial will guide you through using the USR-ES1 W5500 Ethernet module with Arduino.

What You Will Need

USR-ES1 W5500 Ethernet Module
Arduino Board (e.g., Uno, Mega, Nano)
Ethernet Cable
Breadboard and Jumper Wires
A computer with the Arduino IDE installed

Step 1: Understanding the USR-ES1 W5500 Ethernet Module

The W5500 Ethernet module is based on the W5500 chip, which supports:

TCP, UDP, ICMP, IPv4, ARP, IGMP, PPPoE protocols
SPI interface for communication with microcontrollers
Up to 8 simultaneous socket connections

W5500 Pinout

Pin	Function
VCC	Power (3.3V)
GND	Ground
MISO	SPI Data Output
MOSI	SPI Data Input
SCK	SPI Clock
CS (SS)	Chip Select
RST	Reset (optional)

Step 2: Wiring the USR-ES1 W5500 to Arduino

Here’s how to connect the module to an Arduino Uno:

USR-ES1 Pin	Arduino Pin
VCC	3.3V
GND	GND
MISO	Pin 12
MOSI	Pin 11
SCK	Pin 13
CS (SS)	Pin 10
RST	Not connected (optional)

Note: The W5500 operates at 3.3V. Ensure you don’t connect it directly to a 5V supply.

Step 3: Install the Ethernet Library

To communicate with the W5500 module, you’ll need the Ethernet2 library.

Steps to Install the Ethernet2 Library:

Open the Arduino IDE.
Go to Sketch > Include Library > Manage Libraries.
Search for "Ethernet2" in the Library Manager.
Click Install.

Step 4: Upload the Code

Here’s an example sketch to set up the W5500 module as a simple web server:

#include <Ethernet2.h>

// Network configuration
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; // MAC address
IPAddress ip(192, 168, 1, 177); // Static IP address
EthernetServer server(80); // Port 80 for HTTP

void setup() {
  Serial.begin(9600);
  while (!Serial) {
    ; // Wait for Serial Monitor to open
  }

  Serial.println("Initializing Ethernet...");
  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    Ethernet.begin(mac, ip); // Use static IP if DHCP fails
  }

  Serial.print("Ethernet IP Address: ");
  Serial.println(Ethernet.localIP());
  server.begin();
}

void loop() {
  EthernetClient client = server.available(); // Check for incoming clients

  if (client) {
    Serial.println("New client connected");
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        Serial.write(c); // Print incoming data to Serial Monitor

        // Respond to HTTP GET requests
        if (c == '\n') {
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println("Connection: close");
          client.println();
          client.println("<html><body><h1>Hello from Arduino!</h1></body></html>");
          break;
        }
      }
    }
    client.stop(); // Disconnect the client
    Serial.println("Client disconnected");
  }
}

Step 5: Test the Setup

Connect the Arduino to your computer via USB and the W5500 module to your router with an Ethernet cable.
Open the Arduino IDE and select the correct Board and Port under the Tools menu.
Upload the code to the Arduino by clicking Upload.
Open the Serial Monitor (Tools > Serial Monitor) and set the baud rate to 9600. Note the IP address displayed.
Open a web browser and enter the Arduino’s IP address (e.g., http://192.168.1.177).
You should see a webpage displaying "Hello from Arduino!"

Troubleshooting

Ethernet not initializing: Ensure proper wiring and check if the Ethernet cable is securely connected.
IP conflict: Verify that the static IP address does not clash with other devices on the network.
No response in the browser: Ensure the IP address in the code matches your network’s subnet.

Applications of the W5500 Ethernet Module

IoT data logging
Remote control systems
Home automation servers
Sensor networks with web interfaces

Conclusion

You’ve successfully set up the USR-ES1 W5500 Ethernet module with Arduino to create a simple web server. This versatile module enables you to build reliable, wired network-connected projects. Expand this example by integrating sensors, actuators, or databases for more advanced applications!