Combing Arduino Sketches

Hello, I have a question. I need to combine my code for my Arduino Webserver with the code for my Parallax card reader. When I combine them only the RFID card part works? Can someone help me debunk this. I orginally wanted it to be when someone swiped a valid RFID card, that it would launch the webserver? I don't think that's possible though. Here's my code:

#define RFID_ENABLE 2   //to RFID ENABLE
#define CODE_LEN 10      //Max length of RFID tag
#define VALIDATE_TAG 1  //should we validate tag?
#define VALIDATE_LENGTH  200 //maximum reads b/w tag read and validate
#define ITERATION_LENGTH 200 //time, in ms, given to the user to move hand away
#define START_BYTE 0x0A
#define STOP_BYTE 0x0D
#include <SPI.h>
#include <WiFi.h>

char ssid[] = "*******";      //  your network SSID (name)
char pass[] = "*********";   // your network password
char tag[CODE_LEN]; 
int readLed = 4;
int invalidCardled = 5;
int validCardled = 6;
int ipCam = 7;
int doorLock = 8;
int alarm    = 9;
int status = WL_IDLE_STATUS;
WiFiServer server(1025);

void setup() {
  Serial.println("Please Swipe Your Card.");
  pinMode(readLed, OUTPUT);
  pinMode(validCardled , OUTPUT);
  pinMode(invalidCardled, OUTPUT);
  pinMode(ipCam, OUTPUT);
  pinMode(doorLock, OUTPUT);
  pinMode(alarm, OUTPUT);
  if (WiFi.status() == WL_NO_SHIELD) {// check for the presence of the shield:
    Serial.println("WiFi shield not present");
    while(true);        // don't continue
   // attempt to connect to Wifi network:
  while ( status != WL_CONNECTED) {
    Serial.print("Attempting to connect to Network named: ");
    Serial.println(ssid);                   // print the network name (SSID);

    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:   
    status = WiFi.begin(ssid, pass);
    // wait 10 seconds for connection:
  server.begin();                           // start the web server on port 80
  printWifiStatus();                        // you're connected now, so print out the status

void loop() {   //Start our main Arduino Loop
  enableRFID();   //Enable the RFID card
  getRFIDTag();   //Reads the tag
  if(isCodeValid()) {  //Validates that the tag is good
    disableRFID();  //Puts the RFID reader in to low power mode
    sendCode();     //Sends the code read to the serial port
    delay(ITERATION_LENGTH);  //Debounce?
  } else {
    disableRFID();  //Got a incomplete code..

    WiFiClient client = server.available();   // listen for incoming clients

  if (client) {                             // if you get a client,
    Serial.println("new client");           // print a message out the serial port
    String currentLine = "";                // make a String to hold incoming data from the client
    while (client.connected()) {            // loop while the client's connected
      if (client.available()) {             // if there's bytes to read from the client,
        char c = client.read();             // read a byte, then
        Serial.write(c);                    // print it out the serial monitor
        if (c == '\n') {                    // if the byte is a newline character

          // if the current line is blank, you got two newline characters in a row.
          // that's the end of the client HTTP request, so send a response:
          if (currentLine.length() == 0) { 
            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
            // and a content-type so the client knows what's coming, then a blank line:   
            client.println("HTTP/1.1 200 OK");
            client.println("<TITLE>Remote Security Solutions</TITLE>");
            client.println("<div style='background: #FF8000'>");
            client.println("<div style='border: solid 4px #660000'>");
            client.println("<p><u><H1>Remote Door Control</p></u></H1>");
            client.println("<p><h1><b>ATTENTION!!! SOMEONE IS TRYING TO ACCESS A SECURED DOOR!!!</p></h1></b>");
            // the content of the HTTP response follows the header:
            client.print("<H1><p>PLEASE CHOOSE FROM ONE OF THE FOLLOWING OPTIONS BELOW.</p></H1>");
            client.print("<H1><p><font color='#0404B4'>Unlock The Door:</font></H1>");
            client.print("<input type=submit value=ON style=width:100px;height:45px onClick=location.href='/1\'>");
            client.print("<input type=submit value=OFF style=width:100px;height:45px onClick=location.href='/2\'>");
            client.print("<H1><p><font color='#0404B4'>Lock The Door:</font></H1>");
            client.print("<input type=submit value=ON style=width:100px;height:45px onClick=location.href='/3\'>");
            client.print("<input type=submit value=OFF style=width:100px;height:45px onClick=location.href='/4\'>");
            client.print("<H1><p><font color='#0404B4'>Sound The Alarm:</font></H1>");
            client.print("<input type=submit value=ON style=width:100px;height:45px onClick=location.href='/5\'>");
            client.print("<input type=submit value=OFF style=width:100px;height:45px onClick=location.href='/6\'>");
            // The HTTP response ends with another blank line:
            // break out of the while loop:
          else {      // if you got a newline, then clear currentLine:
            currentLine = "";
        else if (c != '\r') {    // if you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine

        if (currentLine.endsWith("GET /1")) {
          digitalWrite(ipCam, HIGH);              
        if (currentLine.endsWith("GET /2")) {
          digitalWrite(ipCam, LOW);               
         if (currentLine.endsWith("GET /3")) {
          digitalWrite(doorLock, HIGH);              
        if (currentLine.endsWith("GET /4")) {
          digitalWrite(doorLock, LOW);              
         if (currentLine.endsWith("GET /5")) {
          digitalWrite(alarm, HIGH);              
        if (currentLine.endsWith("GET /6")) {
          digitalWrite(alarm, LOW);               
    // close the connection:
    Serial.println("client disonnected");

 * Clears out the memory space for the tag to 0s.
void clearCode() {
  for(int i=0; i<CODE_LEN; i++) {
    tag[i] = 0;
 * Sends the tag to the computer.
void sendCode() {
  //This is where I would add a return value (the code) to "validiate" or whatever at.
    Serial.print("Valid Card ID Scanned:"); 

    char full_tag[10];
    for(int i=0; i<CODE_LEN; i++) {

      if (i == 9)  //Edits by riley porter
        Serial.println(tag[i]);  //This checks to see if its the last byte
      else                       //If it is it will print a "new line" so that the codes to jumble together
/********************   RFID Functions  ***********************/
void enableRFID() {
   digitalWrite(RFID_ENABLE, LOW);
   digitalWrite(validCardled, HIGH);

void disableRFID() {
   digitalWrite(RFID_ENABLE, HIGH);

 * Blocking function, waits for and gets the RFID tag.
void getRFIDTag() {
  byte next_byte;
  while(Serial.available() <= 0) {}
  if((next_byte = Serial.read()) == START_BYTE) {     
    byte bytesread = 0;
    while(bytesread < CODE_LEN) {
      if(Serial.available() > 0) { //wait for the next byte
          if((next_byte = Serial.read()) == STOP_BYTE) break;      
          tag[bytesread++] = next_byte;
      digitalWrite(readLed, HIGH);
      digitalWrite(validCardled, HIGH);
      digitalWrite(invalidCardled, HIGH);
      digitalWrite(readLed, LOW);
      digitalWrite(validCardled, LOW);
      digitalWrite(invalidCardled, LOW);
      digitalWrite(validCardled, HIGH);
      digitalWrite(validCardled, LOW);
      digitalWrite(readLed, HIGH);
 * Waits for the next incoming tag to see if it matches
 * the current tag.
boolean isCodeValid() {
  byte next_byte;
  int count = 0;
  while (Serial.available() < 2) {  //there is already a STOP_BYTE in buffer
    delay(1); //probably not a very pure millisecond
    if(count++ > VALIDATE_LENGTH) return false;
  Serial.read(); //throw away extra STOP_BYTE
  if ((next_byte = Serial.read()) == START_BYTE) { 
    byte bytes_read = 0;
    while (bytes_read < CODE_LEN) {
      if (Serial.available() > 0) { //wait for the next byte     
          if ((next_byte = Serial.read()) == STOP_BYTE) break;
          if (tag[bytes_read++] != next_byte) return false;
         digitalWrite(invalidCardled, HIGH);
         digitalWrite(invalidCardled, LOW);

  return true;  
void printWifiStatus() {
  // print the SSID of the network you're attached to:
  Serial.print("SSID: ");

  // print your WiFi shield's IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");

  // print the received signal strength:
  long rssi = WiFi.RSSI();
  Serial.print("signal strength (RSSI):");
  Serial.println(" dBm");
  // print where to go in a browser:
  Serial.print("To see this page in action, open a browser to http://");


Post the question in the Question section of the site. More of the Arduino folks hang out there than here.

Define "doesn't work"
Probably because the Wifi shield uses the same pins as the RFID reader.
lonto81 (author)  steveastrouk3 years ago
Probably not because of that, the RFID card reader is using pins 4, 5, 6 and the Wifi shield is using pins 7, 8, 9. I can't figure out what's wrong with it,