/* Web Server 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 9 Apr 2012 by Tom Igoe */ #include #include #include #include // Enter a MAC address for your controller below--it must match the one the bootloader uses. byte mac[] = {0x12,0x34,0x45,0x78,0x9A,0xBC}; // The IP address will be read from EEPROM or be set to a value default in `configureNetwork()`. IPAddress ip; // Initialize the Ethernet server library // with the IP address and port you want to use // (port 80 is default for HTTP): EthernetServer server(80); // Connections to this port will cause a reset to the bootloader // so a sketch can be uploaded. EthernetServer reset_server(81); void configureNetwork() { // Reads IP address from EEPROM as stored by `WriteNetworkSettings` sketch. #define EEPROM_SIG_1_VALUE 0x55 #define EEPROM_SIG_2_VALUE 0xAA #define EEPROM_SIG_1_OFFSET 0 #define EEPROM_SIG_2_OFFSET 1 #define EEPROM_GATEWAY_OFFSET 3 #define EEPROM_MASK_OFFSET 7 #define EEPROM_MAC_OFFSET 11 #define EEPROM_IP_OFFSET 17 if ((EEPROM.read(EEPROM_SIG_1_OFFSET) == EEPROM_SIG_1_VALUE) && (EEPROM.read(EEPROM_SIG_2_OFFSET) == EEPROM_SIG_2_VALUE)) { ip = IPAddress(EEPROM.read(EEPROM_IP_OFFSET), EEPROM.read(EEPROM_IP_OFFSET+1), EEPROM.read(EEPROM_IP_OFFSET+2), EEPROM.read(EEPROM_IP_OFFSET+3)); } else { ip = IPAddress(192,168,1,1); }; // TODO: Handle MAC, mask & gateway also. } void setup() { // Open serial communications and wait for port to open: Serial.begin(9600); while (!Serial) { ; // wait for serial port to connect. Needed for Leonardo only } configureNetwork(); // start the Ethernet connection and the server: Ethernet.begin(mac, ip); server.begin(); Serial.print("server is at "); Serial.println(Ethernet.localIP()); } void loop() { // Check for a connection that indicates we should reset to the bootloader // so another sketch can be uploaded. // Note: This approach means that if the sketch hangs later in the loop then any connection // attempt will not be detected so reset will not occur. So, don't hang. :) EthernetClient reset_client = reset_server.available(); // Unfortunately requires a byte sent. if (reset_client) { reset_client.stop(); wdt_disable(); wdt_enable(WDTO_2S); while (1); } // 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("Connnection: close"); client.println(); client.println(""); client.println(""); client.print("Reset me @ http://"); client.print(Ethernet.localIP()); client.print(":81

"); // add a meta refresh tag, so the browser pulls again every 5 seconds: 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"); } }