Meus amigos preciso de uma ajuda, o problema é esse:

        Preciso acessar um link de tempos em tempos para  executar uma funçao no meu site,

 Como faço para o meu arduino, com enthernet shield, executar um link na web? 

exemplo: www.test.com/function.php

seria apenas executar como se colocasse no navegador web, nao precisa ler dados.

Obrigado a todos que ajudarem

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Agora com esse exemplo vou adaptar ao que eu preciso

// (c) Copyright 2010-2012 MCQN Ltd.
// Released under Apache License, version 2.0
//
// Simple example to show how to use the HttpClient library
// Get's the web page given at http://<kHostname><kPath> and
// outputs the content to the serial port

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

// This example downloads the URL "http://arduino.cc/"

// Name of the server we want to connect to
const char kHostname[] = "teste.com";
// Path to download (this is the bit after the hostname in the URL
// that you want to download
const char kPath[] = "/sistema.php";

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

// Number of milliseconds to wait without receiving any data before we give up
const int kNetworkTimeout = 30*1000;
// Number of milliseconds to wait if no data is available before trying again
const int kNetworkDelay = 1000;

void setup()
{
// initialize serial communications at 9600 bps:
Serial.begin(9600);

while (Ethernet.begin(mac) != 1)
{
Serial.println("Error getting IP address via DHCP, trying again...");
delay(15000);
}
}

void loop()
{
int err =0;

EthernetClient c;
HttpClient http(c);

err = http.get(kHostname, kPath);
if (err == 0)
{
Serial.println("startedRequest ok");

err = http.responseStatusCode();
if (err >= 0)
{
Serial.print("Got status code: ");
Serial.println(err);

// Usually you'd check that the response code is 200 or a
// similar "success" code (200-299) before carrying on,
// but we'll print out whatever response we get

err = http.skipResponseHeaders();
if (err >= 0)
{
int bodyLen = http.contentLength();
Serial.print("Content length is: ");
Serial.println(bodyLen);
Serial.println();
Serial.println("Body returned follows:");

// Now we've got to the body, so we can print it out
unsigned long timeoutStart = millis();
char c;
// Whilst we haven't timed out & haven't reached the end of the body
while ( (http.connected() || http.available()) &&
((millis() - timeoutStart) < kNetworkTimeout) )
{
if (http.available())
{
c = http.read();
// Print out this character
Serial.print(c);

bodyLen--;
// We read something, reset the timeout counter
timeoutStart = millis();
}
else
{
// We haven't got any data, so let's pause to allow some to
// arrive
delay(kNetworkDelay);
}
}
}
else
{
Serial.print("Failed to skip response headers: ");
Serial.println(err);
}
}
else
{
Serial.print("Getting response failed: ");
Serial.println(err);
}
}
else
{
Serial.print("Connect failed: ");
Serial.println(err);
}
http.stop();

// And just stop, now that we've tried a download
while(1);
}

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