hello-

any help would be appreciated.

I'm on a Mac OS 10.4.10, have an Arduino mini 03 w/ usb hub, breadboarded w/ a photoresistor and LED. I've successfully interfaced with Arduino, running the LDR script from "Arduino Meets Processing." I can upload from Arduino, and the LED responds to light changes.

Once I'm in Processing, there doesn't seem to be explicit communication with my board using the afore-mentioned script (pt 2, for Processing.) BUT the script doesn't give error feedback when played.

I ran the SerialCallResponse script, and Processing applet would respond to ports 0 and 1, but not the others, so it seems that it is communicating.

I'm not savvy enough to be able to break down the script well, so I am guessing that MAYBE that's the last possibility? I've pasted it in below.

other troubleshooting I've done:

1) I've identified my serial port list using your script: [0] tty.usbserial-A4001kuq
2) put a momentary interrupt switch onto my board, used your  example script "simpleread" without a response
3) pulled out all of the FTDI serial driver associated installs from Arduino's driver package (most recent)/ rebooted
4) reinstalled the FTDIserialdriver / reboot
5) ran macos_setup, gave me the "thumbs up" / reboot
6) tried my Processing/LDR script again, no response to the LDR sensor activation


here's the Processing script from "Arduino meets Processing" site:

/*
*  pa_LDR
*  
*  Reads the values which represent the state of a light sensor
*  from the serial port and draws a graphical representation.
*
*  This file is part of the Arduino meets Processing Project.
*  For more information visit http://www.arduino.cc.
*
*  copyleft 2005 by Melvin Ochsmann for Malmö University
*
*/

// importing the processing serial class
import processing.serial.*;

// the display item draws background and grid
 DisplayItems di;

// definition of window size and framerate
 int xWidth = 512;
 int yHeight = 512;
 int fr = 24;

// attributes of the display
 boolean bck = true;
 boolean grid = true;
 boolean g_vert = true;
 boolean g_horiz = true;
 boolean g_values = false;
 boolean output = false;
 
// variables for serial connection, portname and baudrate have to be set
 Serial port;
 String portname = "0";  
 int baudrate = 9600;
 int value = 0;
 String buf="";
 int value1 = 0;  

// variables to draw graphics
 int x, y, cursorSize;
 int cnt = 6;
 
// lets user control DisplayItems properties and value output in console
void keyPressed(){
 if (key == 'b' || key == 'B') bck=!bck;  // background black/white
 if (key == 'g' || key == 'G') grid=!grid;  // grid ON/OFF
 if (key == 'v' || key == 'V') g_values=!g_values;  // grid values ON/IFF  
 if (key == 'o' || key == 'O') output=!output;   //turns value output ON/OFF
}

void setup(){
 // set size and framerate
 size(xWidth, yHeight); frameRate(fr);
 // establish serial port connection      
 port = new Serial(this, portname, baudrate);
 println(port);
 // create DisplayItems object
 di = new DisplayItems();
 ellipseMode(CENTER);
 smooth();
}

void drawLDRState(){
 cnt++; if(cnt>24)  cnt = 6;
 strokeWeight(2);
 stroke(0);
 noFill();
 x = width/2;
 y = height/2;
 
 cursorSize = 5 + cnt*(value1/50);
 
 ellipse(x, y, cursorSize, cursorSize);
 stroke(255,0,0);
 ellipse(x, y, cursorSize-14, cursorSize-14);
 stroke(0,255,0);
 ellipse(x, y, cursorSize-8, cursorSize-8);
 stroke(0,0,255);
 ellipse(x, y, cursorSize-20, cursorSize-20);
 stroke(255);
 ellipse(x, y, cursorSize, cursorSize);
 
}
void serialEvent(int serial){
 // if serial event is not a line break
 if(serial!=10) {        
   // add event to buffer
   buf += char(serial);          
   } else {
   // if serial is line break set value1 to buff and clear it
   value1 = 1023 - int(buf); // we inverse the value by subtracting it from the maximum
   buf="";
   }
   if(output) println("LDR: "+value1);
}

// draw listens to serial port, draw
void draw(){
// listen to serial port and trigger serial event  
 while(port.available() > 0){
       value = port.read();
       serialEvent(value);
   }
// draw background, then PushButtonState and finally rest of DisplayItems  
   di.drawBack();
   drawLDRState();
   di.drawItems();  
}

sorry for the informal copy+paste, i just posted this somewhere else, but i guess it could still help you? seems like the firmata library is perfect for you - esp. now that you've already identified the COM port you need =]

I use
http://www.arduino.cc/playground/Interfacing/Firmata
to get values via serial port - don't forget to adjust the serial port values in the Firmata processing scripts to get the right one

I just posted:
http://processing.org/discourse/yabb_beta/YaBB.cgi?board=Exhibition;acti on=display;num=1213500039

maybe it'll help? =] - lemme know if you have questions

best of luck,
-Jeff