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Topic: Ethernet Shield not working (Read 402 times) previous topic - next topic


Jul 16, 2016, 05:29 pm Last Edit: Jul 16, 2016, 05:39 pm by rameela20
I am a newbie to arduino.I could get data from DHT11.
I am trying send that data to a cloud called "ubidots".I thought of using an ethernet shield to connect to internet via my laptop's ethernet port.I successfully shared my internet connection of the dongle to the ethernet port.I am using a W5100 mega compatible ethernet shield.I tried many things but still i can not run the WebServer example correctly.I always get "Server is at".Orange and green lights of the ethernet shield is also working.As I am new to to this i don't know where the fault is

Code: [Select]
  Web Server

 A simple web server that shows the value of the analog input pins.
 using an Arduino Wiznet Ethernet shield.

 * Ethernet shield attached to pins 10, 11, 12, 13
 * Analog inputs attached to pins A0 through A5 (optional)

 created 18 Dec 2009
 by David A. Mellis
 modified 9 Apr 2012
 by Tom Igoe
 modified 15 Jul 2014
 by Soohwan Kim


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

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
#if defined(WIZ550io_WITH_MACADDRESS) // Use assigned MAC address of WIZ550io
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};

//#define __USE_DHCP__

IPAddress ip(100, 65,97,52);
IPAddress gateway(100, 65,97,49);
IPAddress subnet(255, 255, 255,248);
// fill in your Domain Name Server address here:
IPAddress myDns(172,19,70,210); // google puble dns

// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);

void setup() {
  // Open serial communications and wait for port to open:
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only

  // initialize the ethernet device
#if defined __USE_DHCP__
#if defined(WIZ550io_WITH_MACADDRESS) // Use assigned MAC address of WIZ550io
#if defined(WIZ550io_WITH_MACADDRESS) // Use assigned MAC address of WIZ550io
  Ethernet.begin(ip, myDns, gateway, subnet);
  Ethernet.begin(mac, ip, myDns, gateway, subnet);

  // start the Ethernet connection and the server:
  Serial.print("server is at ");

void loop() {
  // listen for incoming clients
  EthernetClient client = server.available();
  if (client) {
    Serial.println("new client");
    // an http request ends with a blank line
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        // if you've gotten to the end of the line (received a newline
        // character) and the line is blank, the http request has ended,
        // so you can send a reply
        if (c == '\n' && currentLineIsBlank) {
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println("Connection: close");  // the connection will be closed after completion of the response
          client.println("Refresh: 5");  // refresh the page automatically every 5 sec
          client.println("<!DOCTYPE HTML>");
          // output the value of each analog input pin
          for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
            int sensorReading = analogRead(analogChannel);
            client.print("analog input ");
            client.print(" is ");
            client.println("<br />");
        if (c == '\n') {
          // you're starting a new line
          currentLineIsBlank = true;
        else if (c != '\r') {
          // you've gotten a character on the current line
          currentLineIsBlank = false;
    // give the web browser time to receive the data
    // close the connection:
    Serial.println("client disconnected");

The ethernet shield i am using doesn't have a sticker on top.I used the mac address in the example.
can you please help me with this?

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