xml

#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[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(10, 1, 1, 10);
EthernetServer server(80);

void setup()
{
  Serial.begin(115200);
  Ethernet.begin(mac, ip);
  server.begin();
  pinMode(A0, 1);
  pinMode(A1, 1);
}

void loop()
{
  // listen for incoming clients
  EthernetClient client = server.available(); //inicia o webservice
  if (client) {
    // an http request ends with a blank line
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();

        if (c == '\n' && currentLineIsBlank) {
          client.println("HTTP/1.1 200 OK"); //cria um webservice HTTP
          client.println("Content-Type: text/xml"); //cria um documento do tipo XML
          client.println("Connection: close"); //fecha a conexão
          client.println("Refresh: .05"); //Recarrega a pagina a cada .05seg
          client.println();
          client.println("<!DOCTYPE XML>"); //estrutura XML
          client.println("<xml>");
          client.println("Leitura POT ");
          client.println(analogRead(A0)/4); //le o valor do potenciometro
          client.println("</xml>");
          break;
        }
        if (c == '\n') {
          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();
  }
}