Ethernet Shield (W5100) recieves weird data

system · July 30, 2011, 9:09am

Hi,

i tried the Webclient example with the Ethernet Shield v2 and sometimes I get readable data but most of the time not:

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Here's the code:

/*
  Web client
 
 This sketch connects to a website (http://www.google.com)
 using an Arduino Wiznet Ethernet shield. 
 
 Circuit:
 * Ethernet shield attached to pins 10, 11, 12, 13
 
 created 18 Dec 2009
 by David A. Mellis
 
 */

#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:
byte mac[] = {  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = { 192,168,2,177 };
byte server[] = { 74,125,39,147 }; // Google
byte gateway[] = { 192,168,2, 1 };
byte subnet[] = { 255, 255, 255, 0 };


Client client(server, 80);

void setup() {
  // start the Ethernet connection:
  Ethernet.begin(mac, ip, gateway, subnet);
  // start the serial library:
  Serial.begin(9600);
  // give the Ethernet shield a second to initialize:
  delay(1000);
  Serial.println("connecting...");

  // if you get a connection, report back via serial:
  if (client.connect()) {
    Serial.println("connected");
    // Make a HTTP request:
    client.println("GET / HTTP/1.0");
    client.println();
  } 
  else {
    // kf you didn't get a connection to the server:
    Serial.println("connection failed");
  }
}

void loop()
{
  // if there are incoming bytes available 
  // from the server, read them and print them:
  if (client.available()) {
    char c = client.read();
    Serial.print(c);
  }

  // if the server's disconnected, stop the client:
  if (!client.connected()) {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();

    // do nothing forevermore:
    for(;;)
      ;
  }
}

Could someone try the code and tell me if the results are the same?

zoomkat · July 30, 2011, 7:08pm

Try the below code to see if you get something readable.

//zoomkat 11-13-10
//simple ethernet client test code
//for use with IDE 0021 and W5100 ethernet shield
//modify the arduino lan ip address as needed
//open serial monitor to see what the arduino receives
//push the shield reset button to run client again

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

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = { 192, 168, 1, 102 }; // Arduino IP address
byte server[] = { 208, 104, 2, 86 }; // zoomkat's web site

Client client(server, 80);

void setup()
{
  Ethernet.begin(mac, ip);
  Serial.begin(9600);
  Serial.println("starting simple arduino client test");
  Serial.println();

  delay(1000);

  Serial.println("connecting...");

  if (client.connect()) {
    Serial.println("connected");
    client.println("GET /~shb/arduino.txt HTTP/1.0");
    client.println();
  } else {
    Serial.println("connection failed");
  }
}

void loop()
{
  if (client.available()) {
    char c = client.read();
    Serial.print(c);
  }

  if (!client.connected()) {
    Serial.println();
    Serial.println("disconnecting.");
    Serial.println("==================================");
    Serial.println("");
    client.stop();
    for(;;);
  }
}

system · July 31, 2011, 12:31pm

Thanks for your reply. I tried your code but I'm still getting no right output:

starting simple arduino client test

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connected
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==================================

starting simple arduino client test

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starting simple arduino client test

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==================================

zoomkat · July 31, 2011, 5:19pm

Just as a point of reference, below is what ia returned to my serial monitor when I run the code I posted.

starting simple arduino client test

connecting...
connected
HTTP/1.1 200 OK
Date: Sun, 31 Jul 2011 17:16:48 GMT
Server: Apache
Last-Modified: Sat, 13 Nov 2010 16:31:40 GMT
Accept-Ranges: bytes
Content-Length: 51
Connection: close
Content-Type: text/plain; charset=UTF-8

Woohoo! Your arduino ethernet client works!
zoomkat
disconnecting.

system · August 4, 2011, 10:47am

Today I tried the same on my windows machine and everythink just works fine ... Seems to be a Fedora issue, maybe the compiler or a bug in the ethernet library.
Any idea where I can report this or how to explore the issue to get it fixed?

zoomkat · August 5, 2011, 4:02pm

Seems to be a Fedora issue, maybe the compiler or a bug in the ethernet library.
Any idea where I can report this or how to explore the issue to get it fixed?

Fedora forum?

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Ethernet Shield (W5100) recieves weird data

Woohoo! Your arduino ethernet client works! zoomkat disconnecting.

Related Topics

Woohoo! Your arduino ethernet client works!
zoomkat
disconnecting.