I am new to Arduino and also ethernet shield. However, I need these to do my project. I have tried numerous examples given by the Arduino program itself, but I can't seem to connect to the internet.
There would always be the issue: Oops! Google Chrome could not connect to 192.168.1.8.
I do not know what when wrong. I have connected the USB cable to the arduino and the ethernet cable to my computer.
Thanks in advance for your help and assistance.
Connecting the ethernet cable to your computer may be the problem. Do you have the ethernet port on the computer set up to use that same localnet network settings?
SurferTim:
Connecting the ethernet cable to your computer may be the problem. Do you have the ethernet port on the computer set up to use that same localnet network settings?
Sorry, but how do I check the ethernet port on the computer setup that use the same localnet network settings?
I used the Webserver (Arduino example) for testing but, couldn't access internet.
I have connected the USB cable to the arduino and the ethernet cable to my computer.
Most typical arduino web server setups have the arduino ethernet shield connected to a router. If you want a PC to act as a gateway for the arduino, then there are things that need to be configured on the PC to support that activity.
From a command prompt on the Windows computer, enter ipconfig. It will display the network settings for all network devices.
I try connecting the ethernet cable to my router but, I still could not access to the internet.
I am not sure if I have made the correct change of the code (IP and Mac address). I took the IP address of the Ethernet Adapter Local Area Connection.
#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, 0x0F, 0x59, 0x10 };
IPAddress ip(192,168,1,9);
// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(8081);
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
// start the Ethernet connection and the server:
Ethernet.begin(mac, ip);
server.begin();
Serial.print("server is at ");
Serial.println(Ethernet.localIP());
}
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();
Serial.write(c);
// 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();
client.println("");
client.println("");
// 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(analogChannel);
client.print(" is ");
client.print(sensorReading);
client.println("
");
}
client.println("");
break;
}
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
delay(1);
// close the connection:
client.stop();
Serial.println("client disonnected");
}
}
You cannot use an IP that is already in use. Do not use the IP of the computer's network adapter on the Arduino.
You cannot use a mac address that is already in use.
SurferTim:
You cannot use an IP that is already in use. Do not use the IP of the computer's network adapter on the Arduino.You cannot use a mac address that is already in use.
Sorry, but how do I decide which IP to use? While for the mac address, I am using the one that is given on the Arduino Ethernet shield.
I usually check the dhcp server address pool in the router. I use an IP within the localnet but outside that pool. No duplicate IPs on that localnet allowed. My routers are fault tolerant about that, but some aren't. Some routers will not recognize or communicate with an IP in the dhcp range if it did not issue that ip.
Thanks alot, I am able to access it. 
If your arduino is connected to your router, you can try thr below clirnt code without any modifications to see if you can connect to the server.
//zoomkat 9-22-12
//simple client test
//for use with IDE 1.0.1
//with DNS, DHCP, and Host
//open serial monitor and send an e to test
//for use with W5100 based ethernet shields
//remove SD card if inserted
#include <SPI.h>
#include <Ethernet.h>
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //physical mac address
char serverName[] = "web.comporium.net"; // zoomkat's test web page server
EthernetClient client;
//////////////////////
void setup(){
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to configure Ethernet using DHCP");
// no point in carrying on, so do nothing forevermore:
while(true);
}
Serial.begin(9600);
Serial.println("Better client test 9/22/12"); // so I can keep track of what is loaded
Serial.println("Send an e in serial monitor to test"); // what to do to test
}
void loop(){
// check for serial input
if (Serial.available() > 0) //if something in serial buffer
{
byte inChar; // sets inChar as a byte
inChar = Serial.read(); //gets byte from buffer
if(inChar == 'e') // checks to see byte is an e
{
sendGET(); // call sendGET function below when byte is an e
}
}
}
//////////////////////////
void sendGET() //client function to send/receive GET request data.
{
if (client.connect(serverName, 80)) { //starts client connection, checks for connection
Serial.println("connected");
client.println("GET /~shb/arduino.txt HTTP/1.1"); //download text
client.println("Host: web.comporium.net");
client.println("Connection: close"); //close 1.1 persistent connection
client.println(); //end of get request
}
else {
Serial.println("connection failed"); //error message if no client connect
Serial.println();
}
while(client.connected() && !client.available()) delay(1); //waits for data
while (client.connected() || client.available()) { //connected or data available
char c = client.read(); //gets byte from ethernet buffer
Serial.print(c); //prints byte to serial monitor
}
Serial.println();
Serial.println("disconnecting.");
Serial.println("==================");
Serial.println();
client.stop(); //stop client
}