RFID LED application

Forum 2005-2010 (read only) Software Syntax & Programs
1

I'm making a simple application through processing + arduino and my parallex USB rfid reader. I basically just want an LED to light up when the correct RFID is read.

This is my processing code which transmits the RFID code through to the arduino:

import processing.serial.*;
Serial rfidPort;
Serial arduinoPort;
int val;   
void setup() {
println(Serial.list());
rfidPort = new Serial(this, Serial.list()[0], 2400);
rfidPort.setDTR(true);
arduinoPort = new Serial(this, Serial.list()[1], 2400);
arduinoPort.setDTR(true);
}
void draw() {
while (rfidPort.available() > 0) {
String inString = rfidPort.readString();
print(inString);
arduinoPort.write(inString);              
}
}

and this is the code I have running on my arduino:

const int ledPin = 6; 
int inByte;
char Str = '25005F3B1F';
void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);      
}

void loop() {
if (Serial.available() > 0) 
{
inByte = Serial.read();
if (inByte == Str) {     
    digitalWrite(ledPin, HIGH);  
}
else {
      digitalWrite(ledPin, LOW);
}
}
}

So far it seems as if I'm getting the RFID code over to the arduino fine, however I can't get the LED to light up so I must be doing something wrong.

Any suggestions?

(if it isn't already patently obvious, this is one of my first arduino experiments and my first experience in coding too)

2 
char Str = '25005F3B1F';

Trying to squeeze that many characters into a single byte isn't a good idea.

char Str[] = "25005F3B1F";

if (inByte == Str)

You can't compare a single byte to a string.

You need to read a string and compare it to a string.

3

I think you'll find it simpler to get it going by chopping the problem into parts.

  1. read the RFID, and match it in a processing program (and write out a message to say that it is matched) without the Ardiuno.
  2. write a processing program to tell the Arduino to light a LED
  3. figure out a way to pass the RFID from processing to the Arduino, and light an LED.

I assumed you want to match the RFID on the Arduino .
You might want to share with us why, because I don't think it's essential.

GB