#include 
#include 
#include 
SoftwareSerial rfid(3, -1);
char code[10 + 1];
char c;
int Readingbytes = 0;
int BadInput = 0;
String Pin0 = "0000000000";
String Pin1 = "1111111111";
String Pin2 = "2222222222";
boolean User1 = false;
boolean User2 = false;
byte mac[] = { 
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192,168,178, 177);
EthernetServer server(80);
void setup(){
  Serial.begin(9600);
  rfid.begin(9600);
  Ethernet.begin(mac, ip);
  server.begin();
  Serial.print("server is at ");
  Serial.println(Ethernet.localIP());
}
void loop(){
  Serial.flush();
  if (rfid.available() >=  10){
    if(rfid.read() == 02){
      Readingbytes = 0;  
      while(Readingbytes < 10){
        char zeichen = rfid.read();
        code[Readingbytes] = zeichen; 
        Readingbytes++; 
      }    
      code[Readingbytes] = 0;
      Pin0 = code;
      if (Pin0 == Pin1){
         BadInput = 0; 
         User1 = true;
         Pin0 = 0;
         delay(5000);
       }
      else if (Pin0 == Pin2){
        BadInput = 0;
        User2 = true;
        Pin0 = 0;
        delay(5000);
      }
      else{BadInput++;}
      Pin0 = 0;
      signal();
      serial_flush_buffer();
    }
  }
  EthernetClient client = server.available();
  if (client) {
    Serial.println("new client");
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        Serial.write(c);
        if (c == '\n' && currentLineIsBlank) {
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println("Connnection: close");
          client.println();
          client.println("");
          client.println("");
          client.println("");
          client.println("

IDEA-DEV-STORAGE: Home Security System

“); client.println(“”); if(User1){client.println(“User1 (active)”);} if(User2){client.println(“User2 (active)”);} if(!User1){client.println(“User1 (inactive)”);} if(!User2){client.println(“User2 (inactive)”);} 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");
  }
}

void signal(){
  if (BadInput <= 9 && BadInput>0 ){
    //WARN
  }
}
void serial_flush_buffer(){
  while (Serial.read() >= 0);
}

Partlist

• 125Khz RFID module RDM6300 – UART
• Ethernet-Shield