Hi there,
Project I wish to get to: Read RFID card -> Play iTunes -> Send back track name to Arduino with LCD
Where I'm at: As seperate scripts,
I have Arduino with LCD printing text sent from an AppleScript using SerialPort X.
In another script I have Arduino writing to AppleScript based on a RFID card.
Now, I'm trying to combine the scripts.
The script for RFID (based on one from bildr.org) is using Serial.read to get the RFID card tagand putting it in an int array to compare the RFID tag to the known tags.
The script to read an incoming text string from the AppleScript (code from PaulS's posts on forum) is also wanting to use Serial.read and putting in a char array.
Obvious conflict.
I'm not sure how to solve this. I'll post the code below (sorry, it's a bit of a miss, it is a work in progress).
I've left both of the times it's trying to Serial.read in there to show you. I'm aware that this won't work but I'm stuck.
#include <LiquidCrystal.h>
int RFIDResetPin = 13;
//Register your RFID tags here
char tag1[13] = "4500B8A5025A";
char tag2[13] = "4500B8C30F31";
char tag3[13] = "4500B8A4C49D";
#define SOP '<'
#define EOP '>'
bool started = false;
bool ended = false;
char inData[80];
byte index;
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
void setup(){
pinMode(RFIDResetPin, OUTPUT);
digitalWrite(RFIDResetPin, HIGH);
//ONLY NEEDED IF CONTROLING THESE PINS - EG. LEDs
pinMode(6, OUTPUT);
lcd.begin(16, 2);
Serial.begin(9600);
}
void loop(){
char tagString[13];
int index = 0;
boolean reading = false;
//RFID TRYING TO READ
// Read all serial data available, as fast as possible
while(Serial.available() > 0)
{
int readByte = Serial.read(); //read next available byte
if(readByte == 2) reading = true; //begining of tag
if(readByte == 3) reading = false; //end of tag
if(reading && readByte != 2 && readByte != 10 && readByte != 13){
//store the tag
tagString[index] = readByte;
index ++;
}
//TRYING TO READ AppleScript STRING
char inChar = Serial.read();
if(inChar == SOP)
{
index = 0;
inData[index] = '\0';
started = true;
ended = false;
}
else if(inChar == EOP)
{
ended = true;
break;
}
else
{
if(index < 79)
{
inData[index] = inChar;
index++;
inData[index] = '\0';
}
}
}
// We are here either because all pending serial
// data has been read OR because an end of
// packet marker arrived. Which is it?
if(started && ended)
{
// The end of packet marker arrived. Process the packet
Serial.println(inData);
lcd.setCursor(0, 0);
lcd.print(inData);
// Reset for the next packet
started = false;
ended = false;
index = 0;
inData[index] = '\0';
}
checkTag(tagString); //Check if it is a match
clearTag(tagString); //Clear the char of all value
resetReader(); //reset the RFID reader
}
void checkTag(char tag[]){
///////////////////////////////////
//Check the read tag against known tags
///////////////////////////////////
if(strlen(tag) == 0) return; //empty, no need to contunue
if(compareTag(tag, tag1)){ // if matched tag1, do this
lightLED(2);
Serial.print("a");
}else if(compareTag(tag, tag2)){ //if matched tag2, do this
lightLED(2);
Serial.print("b");
}else if(compareTag(tag, tag3)){
lightLED(2);
Serial.print("c");
}else{
Serial.println(tag); //read out any unknown tag
}
}
void lightLED(int pin){
///////////////////////////////////
//Turn on LED on pin "pin" for 250ms
///////////////////////////////////
digitalWrite(pin, HIGH);
delay(250);
digitalWrite(pin, LOW);
}
void resetReader(){
///////////////////////////////////
//Reset the RFID reader to read again.
///////////////////////////////////
digitalWrite(RFIDResetPin, LOW);
digitalWrite(RFIDResetPin, HIGH);
delay(150);
}
void clearTag(char one[]){
///////////////////////////////////
//clear the char array by filling with null - ASCII 0
//Will think same tag has been read otherwise
///////////////////////////////////
for(int i = 0; i < strlen(one); i++){
one[i] = 0;
}
}
boolean compareTag(char one[], char two[]){
///////////////////////////////////
//compare two value to see if same,
//strcmp not working 100% so we do this
///////////////////////////////////
if(strlen(one) == 0) return false; //empty
for(int i = 0; i < 12; i++){
if(one[i] != two[i]) return false;
}
return true; //no mismatches
}
Any help on this one would be greatly appriciated as I'm really new to this and learning as I go. I'm really enjoying it, but keep getting stuck! 
Many thanks