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Ethernet W5100 Module Nano Red 10 Pins

Ethernet W5100 Module Nano Red 10 Pins

The W5100 Ethernet module is a full-featured single-chip solution that enables an Arduino board to connect to the internet without requiring an operating system. It supports a variety of built-in hardware TCP/IP protocols including TCP, UDP, ICMP, IPv4, ARP, IGMP, PPPoE, and more. This module is ideal for embedded web servers and remote control applications.
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Features:

  • Based on W5100 Ethernet Controller
  • Supports 10/100 Base-TX Ethernet
  • Half-duplex and full-duplex operation supported
  • Auto-negotiation and auto cross-over detection
  • IEEE 802.3/802.3u compliant
  • Supports up to 4 simultaneous socket connections
  • Includes hardware TCP/IP stack
  • Supports both MCU bus interface and SPI interface
  • 5V supply voltage, signal levels 3.3V and 5V tolerant
  • Compatible with Arduino IDE's Ethernet Library

Specifications:

  • Power Supply: 5V
  • Signal Voltage: 3.3V/5V tolerant
  • Dimensions: 54mm x 30mm x 17mm
  • Temperature Range: 0 ~ 70℃ (operation), -40 ~ 85℃ (storage)
  • Socket API support for simplified application development

Hardware Protocols Supported:

  • Internet: TCP, UDP, ICMP, IPv4, ARP, IGMP, PPPoE
  • Ethernet: MAC, DLC

Pin Interface:

  • Two 2x10 headers with 2.54mm pitch
  • SPI interface for Arduino communication

Arduino Compatibility:

  • Works with Arduino UNO, Nano, Mega, etc.
  • Uses SPI pins: UNO (D11–D13), Mega (D50–D52)
  • Pin 10 is used as SS (Slave Select)
  • On Mega, pin 53 must be set as an output (even if unused)

Wiring Diagram:

Connection Guide (Arduino Nano):

  • Connect 5V and GND of Nano to +5V and GND of Ethernet module
  • Connect Nano pins:
    • D13 → SCK (Clock)
    • D12 → MISO (Master In Slave Out)
    • D11 → MOSI (Master Out Slave In)
    • D10 → SS (Slave Select)
    • D9 → RESET (optional)

Example: Control LED via Web Page


#include <SPI.h>
#include <Ethernet.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = { 192, 168, 0, 12 };
byte gateway[] = { 192, 168, 0, 1 };
byte subnet[] = { 255, 255, 255, 0 };

EthernetServer server(80);
String readString;
int ledPin = 2;

void setup() {
  pinMode(ledPin, OUTPUT);
  Ethernet.begin(mac, ip, gateway, subnet);
  server.begin();
}

void loop() {
  EthernetClient client = server.available();
  if (client) {
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        if (readString.length() < 100) {
          readString += c;
        }

        if (c == '\n') {
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println();
          client.println("<html><body>");
          client.println("<h1>Arduino Ethernet LED Control</h1>");
          client.println("<a href='/?LEDON'>Turn On LED</a><br>");
          client.println("<a href='/?LEDOFF'>Turn Off LED</a>");
          client.println("</body></html>");

          if (readString.indexOf("?LEDON") > -1) {
            digitalWrite(ledPin, HIGH);
          } else if (readString.indexOf("?LEDOFF") > -1) {
            digitalWrite(ledPin, LOW);
          }

          delay(1);
          client.stop();
          readString = "";
        }
      }
    }
  }
}

Notes:

  • This module can act as both client and server
  • Arduino Ethernet Library supports this module directly
  • Ensure your IP configuration matches your local network setup