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Author Topic: UNO + Ethernet Shield cannot connect to anything  (Read 844 times)
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Hello everyone,
My first time posting. Been playing with the arduino uno for a while now and this week decided to get the arduino ethernet shield. Considering how relatively easy learning the arduino was, this ethernet shield is driving me crazy.
I have been trying the webserver and webclient example sketches, and neither one lets me connect.
I had changed the MAC address to what came with the shield, IP address I assigned to it on my network, and have tried numerous server addresses ( both external internet webpages and local webpages running on my local webserver ). When I go into my router, I can see the arduino connected to my router. I can even ping it from the windows command prompt. But it does fail the ping about 25% of the time. I have tried different network cables, played with the baud rate, and also specifically opened a door for it in my firewall. Only thing I noticed was that the pinging of the arduino seemed to be more successful with a shorter network cable ( I found that odd ).
I have searched these forums and googled for days now without much success.

Does anyone have any suggestions or ideas? I would appreciate any help. Thanks!

This is all that is displayed in my serial monitor with the corresponding code beneath:
connecting...
connection failed

disconnecting.

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[] = {  0x90, 0xA2, 0xDA, 0x00, 0x9F, 0xDC };
byte ip[] = { 192,168,1,177 };
byte server[] = { 208,104,2,86 }; // Google
//byte server[] = {192,168,1,3};

// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
Client client(server, 80);

void setup() {
  // start the Ethernet connection:
  Ethernet.begin(mac, ip);
  // 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 /~shb/arduino.txt HTTP/1.0");
  //  client.println("GET /index1.html 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(;;)
      ;
  }
}


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Miramar Beach, Florida
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Quote
Only thing I noticed was that the pinging of the arduino seemed to be more successful with a shorter network cable ( I found that odd ).

That almost sounds like a power supply problem. How are you powering the boards? Regulated 5 volt, usb, or power plug?
Are you certain the voltage at the 5v pin is 5 volts?
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I am powering the arduino with a USB cable. I never checked the voltage or tried powering it any other way.
Thanks for the suggestion, I will try it out.
G.   
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I checked the voltage and it looks good. I borrowed a friends router to make sure it wasn't that, and I get the same problem with a completely different router.
Is there anything else I can try to debug the connection attempt? Or to track down where it is failing? Is there anything I can test to make sure the ethernet shield isn't just a bad shield?
Thanks.
G.
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So I tried a few more things. I pulled a mega2560 out of another project and pulled the ethernet shield off the uno and put it on. I still get the same results. Somewhere along the lines I did something that resolved the inconsistent pinging issue. It now pings perfectly fine 100% of the time. But unfortunately I still cannot get a connection to the internet from the ethernet shield.
Other than the sketch, is there any configuration I need to do to get the arduino/ethernet shield to connect to the internet?
I am almost thinking of buying another ethernet shield to see if its just not a bad shield (but I really prefer not too). Is there any way to test the shield to see if it's bad?
I appreciate any suggestions.
Thanks.
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Is there a local server you can use for a test? Does your router display a webpage if you enter its ip in a web browser?
http://192.168.1.1
...or any server on that net. I see you tried 192.168.1.3. Is that a web server? Does it display a web page if you enter that ip in a web browser?



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Yeah, I've been using a local web server (192.168.1.3) for my tests (as well as external web pages), both having the same failures. I can connect to my internal web server from a web browser internally or externally just fine.
Yes, when I enter the router's address into a web browser, I can connect to the router. In the router itself I can see all my connected devices, including the ethernet shield connected to the router.

If you have any further suggestions, I am willing to try anything.

Thanks!
G.
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