I started off with my Arduino Ethernet shield by making a simple LED flashing light controlled by the web browser. I posted the link on Facebook and the light started to flash a lot! I wanted to see the IP addresses of the people connecting, but I could not for the life of me figure out how to. Help?
If it matters, here is my code (adapted from the example Web Server included in the software)
/*
Web Server - Modified
A simple web server that shows the value of the analog input pins.
using an Arduino Wiznet Ethernet shield.
Circuit:
* 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 4 Sep 2010
by Tom Igoe
*/
#include <SPI.h>
#include <Ethernet.h>
#define redLED 2
// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = { 0xDE, 0xAA, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = { 192,168,1, 177 };
byte gateway[] = { 192,168,1, 1 };
byte subnet[] = { 255, 255, 0, 0 };
int foo = 0;
String newLine = "";
// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
Server server(80);
boolean redLEDmode = false;
void setup()
{
// start the Ethernet connection and the server:
Ethernet.begin(mac, ip);
server.begin();
Serial.begin(9600);
pinMode(redLED ,OUTPUT);
}
void loop()
{
// listen for incoming clients
Client client = server.available();
if (client) {
// an http request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
// Serial.print(c);
if (newLine.length() < 100){
newLine.concat(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'){
//test if the string starts with GET
byte rip[4];
// Serial.print();
Serial.print(rip[0]);
Serial.print(".");
Serial.print(rip[1]);
Serial.print(".");
Serial.print(rip[2]);
Serial.print(".");
Serial.print(rip[3]);
Serial.print("\n");
//Serial.print("line recieved\n");
if(newLine.indexOf("GET")!= -1){
Serial.print("get ");
//see what "file" was requested
if(newLine.indexOf("On") !=-1){
Serial.print("ON\n");
digitalWrite(redLED,HIGH);
redLEDmode = true;
}else if(newLine.indexOf("Off")!= -1){
Serial.print("OFF\n");
digitalWrite(redLED,LOW);
redLEDmode = false;
}
}
if(currentLineIsBlank) {
// send a standard http response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println();
// output the value of each analog input pin
client.print("<html><head><title>Arduino!!</title><script type=\"text/javascript\">");
client.print("function toggle(each){");
// client.print("alert('th');");
client.print("$.ajax({\ntype:'get',\nasync:true,\nurl:each});\n");
client.print("$('#current').html(each);}");
client.print("</script><script type=\"text/javascript\" src=\"http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js\">");
client.print("</script>");
client.print("<body>");
client.print("<div>Red LED is currently<span id=\"current\">");
if(redLEDmode){
client.print("ON");
}else{
client.print("OFF");
}
client.print("</span></div>");
client.print("<input type=\"button\" onclick=\"toggle('On')\" value=\"Red LED On\" />");
client.print("<input type=\"button\" onclick=\"toggle('Off')\" value=\"Red LED Off\" />");
client.print("<div id=\"test\"></div>");
client.print("</body>");
break;
}
}
if (c == '\n') {
// you're starting a new line
currentLineIsBlank = true;
newLine = "";
}
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();
}
}
| Arduino Forum :: Using Arduino :: Networking, Protocols, and Devices :: Get IP Address of Anyone Connected to my Arduino set up as server