Untitled

#include<SPI.h>
#include<Ethernet.h>

int led = 8;
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xEF, 0xED};
EthernetServer server(80);
String readString;

float temperatur;
void setup() {
  Serial.begin(9600);
  pinMode(led, OUTPUT);
  Ethernet.begin(mac);
  Serial.print("Serverens IP: ");
  Serial.println(Ethernet.localIP());
}
boolean leseTemp;
boolean leseLys;
void loop() {
  EthernetClient client = server.available();

  if (client) {
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        Serial.print(c);

        if (readString.length() < 100) {
          readString += c;
        }
        if (c == '\n') {
          Serial.print(readString);
          client.println("<HTTP/1.1 200 OK>");
          client.println("<Connection-Type: text/html>");
          client.println("<Connection: close>");
          client.println();

          client.println("<!DOCTYPE html>");
          client.println("<html>");
          client.println("<head>");
          client.println("<title>Webserver</title>");
          client.println("</head>");
          client.println("<body>");
          client.println("<a href=\"/?button1on\"\"><button>LED ON </button></a>");
          client.println("<a href=\"/?button2off\"\"><button>LED OFF </button></a>");
          client.println("<p>Velg frekvens</p>");
          client.println("<input id=\"faen\"></input><br>");
          client.println("<button id=\"knapp\" onClick=\"function(){window.location.pathname = \"/?frekvens\"+document.getElementById(\"faen\").value;} >Bruk frekvens</button><br>");
          client.println("<a href=\"/?monitoron\"\"><button>Skru på Målinger</button></a>");
          client.println("<a href=\"/?monitoroff\"\"><button>Skru på Målinger</button></a>");
          client.println("<body style=background-color:powderblue>");

          String frek = "?frekvens";

          delay(1);
          client.stop();

          if (readString.indexOf("?button1on") > 0) {
            digitalWrite(led, HIGH);
          }

          if (readString.indexOf("?button2off") > 0) {
            digitalWrite(led, LOW);
          }
          if (readString.indexOf(frek) > 0) {
            String frekvens = readString.substring(readString.indexOf(frek)+frek.length());
            int frekvensVerdi = frekvens.toInt();
            //velg pinen som er koblet opp til buzzeren, sett den som writepin i setup
            tone(pin, frekvensVerdi);
            }
          if (readString.indexOf("?monitoron") > 0) {
            //skrur på temp
            leseTemp = true;
            digitalWrite(greenLED, HIGH);
            //lysintensitetmålinger
            leseLys = true;

            }
           else if(readString.indexOf("?monitoroff") > 0){
            digitalWrite(greenLED, LOW);
            leseTemp = false;
            leseLys = false;
            }
            if(leseTemp){
            temperatur = analogRead(temppin);
            temperatur = ((temperatur/1024.0) - .5)*100;
            client.println("<p>Temperatur: "+temperatur+"</p>";
            }
          readString = "";
        }
      }
    }
  }

}