Ethernet W5100 Shield Network Expansion Board with Micro SD Card Slot

The Ethernet W5100 Shield with Micro SD Card Slot is an expansion board designed for Arduino boards (such as Arduino Uno, Mega, etc.) to provide Ethernet connectivity and the ability to interface with a micro SD card. It uses the W5100 Ethernet chip to enable communication over a network (wired Ethernet) and the micro SD card slot allows you to store and retrieve data locally.

This shield is commonly used in projects where you need an Arduino to communicate over a local network or the internet (e.g., web servers, IoT applications), as well as store or log data to an SD card.

Key Features of the Ethernet W5100 Shield:

1. W5100 Ethernet Chip:

• The W5100 Ethernet chip provides TCP/IP networking functionality, allowing Arduino to connect to the internet or a local network.
• It supports Ethernet over RJ45, meaning you can use standard Ethernet cables to connect to a wired network or router.

1. Micro SD Card Slot:

• The shield includes a micro SD card slot that allows you to interface with micro SD cards (usually formatted in FAT16 or FAT32 file systems).
• You can use the SD card to store logs, serve files, or read and write data directly from the Arduino.

1. Arduino Compatibility:

• The shield is compatible with Arduino boards that use Arduino Uno, Mega, Leonardo, or other compatible models.
• It easily stacks on top of the Arduino board, providing Ethernet connectivity via the SPI (Serial Peripheral Interface) bus.

1. Networking:

• Static IP configuration: You can configure the shield with a static IP address for specific applications like a web server.
• DHCP support: The shield can also be configured to use DHCP (Dynamic Host Configuration Protocol) to automatically obtain an IP address from the network.
• Supports both client and server modes, meaning it can be used to communicate with other devices or serve web pages or data.

1. Status LEDs:

• The shield typically includes LEDs to show the status of the network connection (e.g., Link, Activity, and Power).

1. SPI Communication:

• The Ethernet shield communicates with the Arduino board via SPI (Serial Peripheral Interface), so it uses the MISO, MOSI, SCK, and SS pins on the Arduino board.

Pinout of the Ethernet W5100 Shield:

The Ethernet W5100 shield uses the following pins on the Arduino:

PinDescriptionPin 10CS (Chip Select) for EthernetPin 11MOSI (Master Out Slave In)Pin 12MISO (Master In Slave Out)Pin 13SCK (Serial Clock)Pin 4CS (Chip Select) for SD card

Typical Connections:

• Ethernet Port (RJ45): This is where you connect the shield to your local network or router using a standard Ethernet cable.
• Micro SD Card Slot: Use a microSD card to store files, logs, or data that can be accessed by the Arduino.
• Arduino Board: The shield is designed to stack directly onto an Arduino board, which then interfaces with the Ethernet chip and the SD card slot.

Example Arduino Code to Connect to Ethernet and Use SD Card:

Here’s a basic example to get the shield working with both the Ethernet and SD card functionalities:

1. Setup Network (Ethernet)

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

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

void setup() {
  // Start the Serial Monitor for debugging
  Serial.begin(9600);
  
  // Initialize Ethernet shield
  Ethernet.begin(mac, ip);
  server.begin();

  // Initialize SD card
  if (!SD.begin(4)) {  // Pin 4 is used for SD card CS
    Serial.println("SD Card initialization failed!");
    return;
  }
  Serial.println("SD Card initialized.");

  // Print the IP address to Serial Monitor
  Serial.print("Arduino is connected to the network with IP: ");
  Serial.println(Ethernet.localIP());
}

void loop() {
  EthernetClient client = server.available();
  if (client) {
    // Read HTTP request
    String request = client.readStringUntil('\r');
    client.flush();
    
    // Serve a simple HTTP response
    if (request.indexOf("GET /") != -1) {
      // Open a file from the SD card
      File file = SD.open("data.txt");
      if (file) {
        // Serve the content of the file
        client.println("HTTP/1.1 200 OK");
        client.println("Content-Type: text/plain");
        client.println("Connection: close");
        client.println();
        while (file.available()) {
          client.write(file.read());
        }
        file.close();
      } else {
        // File not found
        client.println("HTTP/1.1 404 Not Found");
        client.println("Content-Type: text/plain");
        client.println("Connection: close");
        client.println();
        client.println("File not found on SD card.");
      }
    }

    delay(1);  // Close the connection
    client.stop();
  }
}

Brand:- Generic

Origin:- China