Basic Arduino Web Server
So, you've got an Arduino and an Ethernet shield and want to use it as a web server? If you don't know how to do this it can be slightly intimidating, so here is a basic server example for the Arduino with full explanations.
This sketch was written for a Arduino Duemilanove with a Adafruit ethershield (Wiznet).
Here is the commented code. The code is also available for download below.
//
// Basic Web Server
// http://www.seancarney.ca/projects/basic-arduino-web-server
// Sean Carney - 2010
//
// This lets the system know we want to use the Ethernet module
// and need some additional functionality
#include <Ethernet.h>
// This is the hardware address of the Arduino on your network.
// You won't need to change this. Learn more here.
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
// This is the tcp/ip address of the Arduino on your network.
// You will access the Arduino by typing it in a web browser like
// this: http://192.168.1.177 Learn more here.
// You might want to change this to be the same as your computer's
// IP address except for the last number. Learn more here.
byte ip[] = { 192, 168, 1, 177 };
// Create a server named webserver listening on port 80 (http). You
// don't want to change the port number. Learn more about ports or
// the server class.
Server webserver(80);
// Functions that are run once when the Arduino is started
void setup()
{
// Bring the Arduino on the network using the MAC and IP we
//specified before. Learn more about Ethernet.begin().
Ethernet.begin(mac, ip);
// Start a server on the port we specified before. Learn more
// about server.begin().
webserver.begin();
}
// Repeat these functions as long as the Arduino is powered on
void loop()
{
// Create a client named webclient listening for connections to the
// server. Learn more about Client or server.available()
Client webclient = server.available();
// If someone connects to the server...
if (webclient) {
// Create a variable to hold whether or not we have received a blank
// line from the web browser
boolean current_line_is_blank = true;
// Run the following code as long as the client remains connected
// Learn more about client.connected()
while (webclient.connected()) {
// If the client has sent us some data...
// Learn more about client.available()
if (webclient.available()) {
// Keep the last letter of whatever they sent us
// Learn more about client.read()
char c = webclient.read();
// If we've gotten to the end of the line (received a newline
// character) and the line is blank, the http request has ended,
// so we can send a reply
if (c == 'n' && current_line_is_blank) {
// Send a basic HTTP response header (the blank line at the end
// is required). Learn more about client.println()
webclient.println("HTTP/1.1 200 OK");
webclient.println("Content-Type: text/html");
webclient.println();
// Now send whatever html you want to appear on the web page
webclient.println("<html><body><p>Testing...</p></body></html>");
break;
}
// If we received a new line character from the client ...
if (c == 'n') {
// Track that the line is blank
current_line_is_blank = true;
// If we don't receive a new line character and don't receive an r
} else if (c != 'r') {
// Track that we we got some data
current_line_is_blank = false;
}
}
}
// Give the client some time to receive the page
// Learn more about delay()
delay(1);
// Close the connection to the client now that we are finished
// Learn more about client.stop()
webclient.stop();
}
}
| Attachment | Size |
|---|---|
| Basic Web Server 2010-06-14.pde | 3.04 KB |
- 1249 reads
Comments
So Cool!
Man this is so cool. I was looking a round for such a thing. Thank you for posting and making possible to share with all the geeks around the world. Thank You!
I was wondering if you have a tutorial about how to setup the script to parse the data from the Arduino to the web page to make your weather station. PHP?, MySql, Perl? Or if at least you could recommend me some reference material.
Thank you in Advance.
Greetings from Texas : )
Parsing a Web Page
Hi George;
I wrote a script to parse web pages on my server using PHP. Using this I was able to reformat a standard web page into XML which is easier to handle on the Arduino. If you can find an XML weather feed for your location the intermediary step isn't necessary, but I couldn't find one that worked for my purposes.
To see the code used to parse XML data on the Arduino, please check the source code for the Weather Clock project specifically the fetchWeather() function.
Basically the function works by requesting a page from the remote server and breaking it down line by line. Each line is checked to see if it starts with a specific XML tag using the startsWith function. If the line matches a specific tag, the value is extracted using the subString function based on the known length of the leading and tailing tags.
A good place to learn more is by searching the arduino.cc forums and you can learn more about the WString library by reading the source code of WString.h.
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