Hello,

I am making a Arduino/Processing based CNC. What im trying to create is a line following program in processing. You create a png image on paint or similar program 1000 x 1000 (cutting area of my cnc). You design what you want to be cut/engraved on paint placing black lines (black = cut, white = nocut). You then open this up in processing and it will scan the image until it finds a black line, once its found a black line it will then follow the outline of that black line until it reaches back to the start. Then it carrys on scanning but ignors that part of the line already been cut. When its cutting it outputs the X and Y cord plus Z cord for cut and no cut to the arduino. The idea came from a guy on youtube which his account seems to be inactive so i get no responce from him. So i am trying to recreate it. Here is the video:

http://www.youtube.com/watch?v=qZRcu0J6hCQ&feature=plcp

And here is my code so far:

1. PImage pic;
   int xCheck, yCheck, xPlot, yPlot, index, indexPlot, scan, first;
   float thresh;
   
   void setup(){
     pic = loadImage("image.png");
     size(pic.width, pic.height);
     image(pic, 0, 0);
     scan = 1;
   }
   
   void draw(){
     noStroke();
    
     if(scan == 1){
       first = 0;
       for(int i = 0; i < 100; i++){
         xCheck++;
         if(xCheck > 1000){
           yCheck++;
           xCheck = 0;
         }
         if(yCheck > 1000){
           xCheck = 0;
           yCheck = 0;
         }
      
         index = xCheck + yCheck*width;
         thresh = brightness(pic.pixels[index]);
         if(thresh == 0){
           fill(0,255,0);
           ellipse(xCheck, yCheck, 1, 1);
           scan = 0;
         }else{
           fill(255,0,0);
           ellipse(xCheck, yCheck, 1, 1);
         }
       }
     }else{
       if(first == 0){
         xPlot = xCheck;
         yPlot = yCheck;
         first = 1;
       }
      
       indexPlot = xPlot + yPlot*width;
      
       fill(150,150,255);
       ellipse(xPlot, yPlot, 1,  1);
      
       if(brightness(pic.pixels[indexPlot+1]) == 0){
         xPlot++;
       }else{
         if(brightness(pic.pixels[indexPlot+1000]) == 0){
           yPlot++;
         }else{
           if(brightness(pic.pixels[indexPlot-1]) == 0){
             xPlot--;
           }else{
             if(brightness(pic.pixels[indexPlot+1000]) == 0){
               yPlot--;
             }
           }
         }
       }
     }
   }

And heres the image i am testing with:

Hello and thanks for visiting my question,

What im trying to do is load a text document which has lots of lines of text and numbers (g-code to be exact). And i want to analyse each line and remove characters i dont want, then save this to a new text document.

The reason being is i have a custom made CNC and i want to take the G-Code and strip it so it only leaves the X Y and Z part. But the X Y and Z in the G-Code is arranged like this "X200 Y100 Z100" well i need it to be arranged like this "200X 100Y 100Z". I have this so far:

1. String[] lines; // file array
   int index;
   String current;
   
   void setup(){
     size(200, 200);
    
     lines = loadStrings("GCode.txt");
     println(Serial.list());
    
     println("File is " + lines.length + " lines long");
   }
   
   void draw(){
    
     if(index < lines.length){
       current = lines[index];
       println("Line " + index + ": " + lines[index]);
       index = index + 1;
      
     }
   }

Hello,

Basically i am working on a Web based RC car. I have already made the server and client and everything works great :D

But i have one slight problem. I have exported the client side of the RC Car Controller as a applet to my website and it works fine. But the IP Address and Port are defined within the Source Code. I did have it so that it read a txt file containing the IP Address and Port but when i exported as applet, the txt file became part of the jar file which i dont want. I need to be able to edit this txt file on my website which can then be read by processing and connect to the server.

Thats my first methord but im not sure on how to do it.

The second thing i thought of is prehaps bringing up a dialog box which you enter the IP Address and port into. But the client is created in the void.setup(){}. So i need to bring up the dialog box within the void.setup(){}, you enter the information and when you hit enter it continues with the code with the varibles you just set. Im not sure if this is possible.

I would paste the web link for the client so you can see what i mean by all this but then i would have random people controlling my RC car :P

Any help would be great,

Thanks,

Calum.

Hello.

Im trying to use the BufferedImage function but it doesn't work.

im using:

1. import com.sun.image.codec.jpeg.*;

Hey guys,

I am kinda new to processing and cant seem to work out how the array and ArrayList work. Basically i want to be able to create shapes with my mouse. So i click once and that sets 1 point, click again and that sets another point, then make a rectangle between those two points and have the X coordinates of each end of the rectangle put into an array so they can be read when needed. I need to be able to make multiple rectangles.

If anyone can give me some sample code or some advice on how to do this i would be greatly appreciated.

Thanks,

Calum.

Hey guys.

I found this code when looking at Ball balancing machines on Youtube. The link for the video is here:

http://www.youtube.com/watch?v=0DqcnHE6r9M

He provides the code in the description and i wanted to check it out and see how it worked because i also want to make one. But i keep getting an error in processing and this is the exact code copied from his website. The error says:

expecting RPAREN, found ';'
processing.app.debug.RunnerException: Syntax error, maybe a missing right parenthesis?
    at processing.app.Sketch.preprocess(Sketch.java:1314)
    at processing.app.Sketch.preprocess(Sketch.java:1205)
    at processing.app.Sketch.build(Sketch.java:1568)
    at processing.app.Sketch.build(Sketch.java:1553)
    at processing.app.Editor$DefaultRunHandler.run(Editor.java:1485)
    at java.lang.Thread.run(Thread.java:619)

And its on this line:

1. if (key &lt; 'A' &amp; &amp; key &gt; '/') {   // THIS LINE <<<<<<<<<
   
2. Kfactor += ((key-48) * pow(10, (K_digits-1)));
3. K_digits --;
4. }

Im still relatively new to processing and this is the first time i have ever seen or used firmata. If anyone could help i would be extremely grateful.

Hey guys.

I had a thought today. I have been wanting to use my keyboard and mouse on my xbox 360 as a controller, and i was originally going to do this with arduino by connecting the mouse and keyboard to the arduino directly, then modding a old xbox 360 controller which will also be hooked up to the arduino with digipots. But i had another idea and wondered if it would be possible to just use processing and the PC itself. So in processing grab the X and Y movement of the mouse and the keys from the keyboard and then plugging a USB lead from the PC into the xbox and somehow get the xbox to recognize the PC as a USB controller. Would this be possible since you need the computer to act as a controller. Just a thought and if it is possible does anyone know away of doing it?

Thanks.

Calum