Hi everyone,

I'm at the very beginning stages of developing a system for an art installation.  I'm using Processing with an Arduino and a USB-Serial converter (Tripp-Lite U209-000-R) to talk to a projector (Eiki LC-X999) from my sketch.  I downloaded an open source driver for the USB-Serial adapter, since this serial adapter was developed only for Windows machine.  I found the driver here: whoops just found that I'm a newbie and can't add URL's to posts yet... but I found it through google "U209-000-R OS X" under at erdelynet  

I believe that I'm able to talk to the adapter from the Mac, gauged by the fact the adapter shows up in my tty* device list and when I send write commands the LED on it lights up.

My trouble is that the projector is not responding to the commands I am sending from the sketch.  But if I use the exact same hardware minus (USB-Serial converter, DB-9 to mini-DIN cable, projector) on a Windows XP system via HyperTerminal I am able to send commands and have the projector respond accordingly.  Right now all I'm trying to do is turn it on, which is done as follows:

ASCII -- C00
Hex -- 43 30 30
and immediately following the command the projector requires a carriage return and line feed.
ASCII -- CRLF
Hex -- 0D 0A

all in all, my hex string for turn-on should be (which again, works in hyperterminal by typing 'C00<enter>'):  43 30 30 0D 0A

I'm not sure if the issue lies in the OS X driver for the USB-Serial adapter, or in the way that I'm writing the code, or in the ASCII to hex conversions that I'm doing...  The conversion is done as a combination of variable declarations before setup() and then when writing to the serial port a call to hex() is used.  The serial port write is carried out in the function initProjector().

Also, the connection parameters are matched between the platforms: 19200, 8-N-1.

Any help would be very, very, very much appreciated!!!

Thanks,
Sarah

---

// Import libraries
import processing.video.*;
import processing.serial.*;

// Camera Capture parameters
Capture cam;
MovieMaker mm;  // Declare MovieMaker object
PImage bkg;

// Arduino serial port parameters
Serial myArduino;
int inByte;

// temp  var
int i;

// Projector serial port parameters and commands
Serial myProjector;
int stringlen = 5;
int inByteProj;

// ASCII to hex translation
byte ascii0 = '0';
byte ascii1 = '1';
byte ascii2 = '2';
byte ascii3 = '3';
byte ascii4 = '4';
byte ascii5 = '5';
byte ascii6 = '6';
byte ascii7 = '7';
byte ascii8 = '8';
byte ascii9 = '9';
byte asciiLF = 10;     //x0A
byte asciiCR = 13;     //x0D
byte asciiA = 'A';
byte asciiB = 'B';
byte asciiC = 'C';
byte asciiD = 'D';
byte asciiE = 'E';
byte asciiF = 'F';


void setup() {
 size(640,480);
//  size(1280, 854);  // full screen
 
 // cam = new Capture(this, 320, 240);
 String[] devices = Capture.list();
 println(devices);
 cam = new Capture(this, width, height, devices[1]);
 cam.frameRate(30);

   
 // Create MovieMaker object with size, filename,
 // compression codec and quality, framerate
 mm = new MovieMaker(this, width, height, "test_vid.mov", 12, MovieMaker.VIDEO, MovieMaker.BEST, 3);
 
 // Backround image...
 bkg = loadImage("/Users/sbearse/Pictures/goodbye/providence2.jpg");
 
 // Serial port parameters
 println(Serial.list());
 myArduino = new Serial(this, Serial.list()[ 2], 9600);
 myProjector = new Serial(this, Serial.list()[ 4], 19200);

 // Initialize the projector
 initProjector();

 background(204);
}

void draw() {  
   if (cam.available() == true) {
   cam.read();
   image(cam, 0, 0);
   mm.addFrame();  // Add window's pixels to movie
   
   if (myArduino.available() > 0)
   { int inByte = myArduino.read();
     println(inByte);
    }
   }
 }


void keyPressed() {
 if (keyPressed) {
   if (key == 'x') {
   mm.finish();  // Finish the movie if space bar is pressed!
   println("finish");
 }
 if (key == 's') {
   initProjector();
 }
}
}

void initProjector() {
byte[] projON = new byte[stringlen];
projON[0] = asciiC;
projON[1] = ascii0;
projON[2] = ascii0;
projON[3] = asciiCR;
projON[4] = asciiLF;

 for(i=0; i<stringlen; i++) {
   // write each hex byte to serial port
   myProjector.write(hex(projON[i]));
   // print each byte to verify data
   print(hex(projON[i]));
   }
   
 println();
 // delay 40ms, requirement of projector
 delay(40);
}