/*-------------------------------------------------------------- Program: eth_websrv_LED Description: Arduino web server that serves up a web page allowing the user to control an LED Hardware: - Arduino Uno and official Arduino Ethernet shield. Should work with other Arduinos and compatible Ethernet shields. - LED and resistor in series connected between Arduino pin 2 and GND Software: Developed using Arduino 1.0.3 software Should be compatible with Arduino 1.0 + References: - WebServer example by David A. Mellis and modified by Tom Igoe - Ethernet library documentation: http://arduino.cc/en/Reference/Ethernet Date: 11 January 2013 Author: W.A. Smith, http://startingelectronics.com --------------------------------------------------------------*/ #include #include // MAC address from Ethernet shield sticker under board byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; IPAddress ip(10, 0, 0, 6); // IP address, may need to change depending on network EthernetServer server(80); // create a server at port 80 String HTTP_req; // stores the HTTP request boolean LED_status = 0; // state of LED, off by default void setup() { Ethernet.begin(mac, ip); // initialize Ethernet device server.begin(); // start to listen for clients Serial.begin(9600); // for diagnostics pinMode(2, OUTPUT); // LED on pin 2 } void loop() { EthernetClient client = server.available(); // try to get client if (client) { // got client? boolean currentLineIsBlank = true; while (client.connected()) { if (client.available()) { // client data available to read char c = client.read(); // read 1 byte (character) from client HTTP_req += c; // save the HTTP request 1 char at a time // last line of client request is blank and ends with \n // respond to client only after last line received 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"); client.println(); // send web page client.println(""); client.println(""); client.println(""); client.println("Arduino LED Control"); client.println(""); client.println(""); client.println("

LED

"); client.println("

Click to switch LED on and off.

"); client.println(""); client.println(""); client.println(""); Serial.print(HTTP_req); HTTP_req = ""; // finished with request, empty string break; } // every line of text received from the client ends with \r\n if (c == '\n') { // last character on line of received text // starting new line with next character read currentLineIsBlank = true; } else if (c != '\r') { // a text character was received from client currentLineIsBlank = false; } } // end if (client.available()) } // end while (client.connected()) delay(1); // give the web browser time to receive the data client.stop(); // close the connection } // end if (client) } // switch LED and send back HTML for LED checkbox void ProcessCheckbox(EthernetClient cl) { if (HTTP_req.indexOf("LED2=2") > -1) { // see if checkbox was clicked // the checkbox was clicked, toggle the LED if (LED_status) { LED_status = 0; } else { LED_status = 1; } } if (LED_status) { // switch LED on digitalWrite(2, HIGH); // checkbox is checked cl.println("LED2"); } else { // switch LED off digitalWrite(2, LOW); // checkbox is unchecked cl.println("LED2"); } }