myPort.write(0x00); // turns one line to all black

I'm now looking to be able to display images onto the display with a pixel array, I've used a version of ladyadas thermal printer bitmap (only runs on processing 1.5.1) converter sketch to take pixel data and create hex calls for each vertical column on the display. See original sketch below. 

2. // Convert image to a C header file suitable for the Adafruit_Thermal library.
3. // This is NOT an Arduino sketch.  Runs in Processing IDE (www.processing.org)
4. 
   
5. void setup() {
6.   String      filename, basename;
7.   PImage      img;
8.   PrintWriter output;
9.   int         i, x, y, b, rowBytes, totalBytes, lastBit, sum, n;
10. 
    
11.   // Select and load image
12.   filename   = selectInput("Select image file to convert:");
13.   println("Loading image...");
14.   img        = loadImage(filename);
15. 
    
16.   // Morph filename into output filename and base name for data
17.   x = filename.lastIndexOf('.');
18.   if(x > 0) filename = filename.substring(0, x);  // Strip current extension
19.   x = filename.lastIndexOf('/');
20.   if(x > 0) basename = filename.substring(x + 1); // Strip path
21.   else      basename = filename;
22.   filename += ".h"; // Append '.h' to output filename
23.   println("Writing output to " + filename);
24. 
    
25.   // Calculate output size
26.   rowBytes   = (img.width + 7) / 8;
27.   totalBytes = rowBytes * img.height;
28.   // Convert image to B&W, make pixels readable
29.   img.filter(THRESHOLD);
30.   img.loadPixels();
31. 
    
32.   // Open header file for output (NOTE: WILL CLOBBER EXISTING .H FILE, if any)
33.   output = createWriter(filename); 
34. 
    
35.   // Write image dimensions and beginning of array
36.   output.println("#ifndef _" + basename + "_h_");
37.   output.println("#define _" + basename + "_h_");
38.   output.println();
39.   output.println("#define " + basename + "_width  " + img.width);
40.   output.println("#define " + basename + "_height " + img.height);
41.   output.println();
42.   output.print("static PROGMEM prog_uchar " + basename + "_data[] = {");
43. 
    
44.   // Generate body of array
45.   for(i=n=y=0; y<img.height; y++) { // Each row...
46.     output.print("\n  ");
47.     for(x=0; x<rowBytes; x++) { // Each 8-pixel block within row...
48.       lastBit = (x < rowBytes - 1) ? 1 : (1 << (rowBytes * 8 - img.width));
49.       sum     = 0; // Clear accumulated 8 bits
50.       for(b=128; b>=lastBit; b >>= 1) { // Each pixel within block...
51.         if((img.pixels[i++] & 1) == 0) sum |= b; // If black pixel, set bit
52.       }
53.       output.format("0x%02X", sum); // Write accumulated bits
54.       if(++n < totalBytes) output.print(',');
55.     }
56.   }
57. 
    
58.   // End array, close file, exit program
59.   output.println();
60.   output.println("};");
61.   output.println();
62.   output.println("#endif // _" + basename + "_h_");
63.   output.flush();
64.   output.close();
65.   println("Done!");
66.   exit();
67. }
68. 
    

And my modified version with port writes instead of output to file writes - It's replicating this line with a myPort.write that I am struggling with: 

2.       output.format("0x%02X", sum); // Write accumulated bits
3.       if(++n < totalBytes) output.print(',');

2. 
   
3. import processing.serial.*;
4. Serial myPort;
5. // Convert image to a C header file suitable for the Adafruit_Thermal library.
6. // This is NOT an Arduino sketch.  Runs in Processing IDE (www.processing.org)
7. 
   
8. void setup() {
9.   
10.     println(Serial.list());
11.  
12.   // Open the port you are using at the rate you want:
13.   myPort = new Serial(this, Serial.list()[0], 57600);
14. 
    
15. 
    
16.   String      filename, basename;
17.   PImage      img;
18.   PrintWriter output;
19.   int         i, x, y, b, rowBytes, totalBytes, lastBit, sum, n;
20. 
    
21.   // Select and load image
22.   filename   = selectInput("Select image file to convert:");
23.   println("Loading image...");
24.   img        = loadImage(filename);
25. 
    
26.   // Morph filename into output filename and base name for data
27.   x = filename.lastIndexOf('.'); 
28.   if(x > 0) filename = filename.substring(0, x);  // Strip current extension
29.   x = filename.lastIndexOf('/');
30.   if(x > 0) basename = filename.substring(x + 1); // Strip path
31.   else      basename = filename;
32.   filename += ".h"; // Append '.h' to output filename
33.   println("Writing output to " + filename);
34. 
    
35.   // Calculate output size
36.   rowBytes   = (img.width + 7) / 8;
37.   totalBytes = rowBytes * img.height;
38.   // Convert image to B&W, make pixels readable
39.   img.filter(THRESHOLD);
40.   img.loadPixels();
41. //
42. //  // Open header file for output (NOTE: WILL CLOBBER EXISTING .H FILE, if any)
43. //  output = createWriter(filename); 
44. //
45. //  // Write image dimensions and beginning of array
46. //  output.println("#ifndef _" + basename + "_h_");
47. //  output.println("#define _" + basename + "_h_");
48. //  output.println();
49. //  output.println("#define " + basename + "_width  " + img.width);
50. //  output.println("#define " + basename + "_height " + img.height);
51. //  output.println();
52. //  output.print("static PROGMEM prog_uchar " + basename + "_data[] = {");
53. 
    
54.   // Generate body of array
55.   myPort.write(0x80);  //header
56. 
    
57.   for(i=n=y=0; y<img.height; y++) { // Each row...
58.     //output.print("\n  ");
59.     for(x=0; x<rowBytes; x++) { // Each 8-pixel block within row...
60.       lastBit = (x < rowBytes - 1) ? 1 : (1 << (rowBytes * 8 - img.width));
61.       sum     = 0; // Clear accumulated 8 bits
62.       for(b=128; b>=lastBit; b >>= 1) { // Each pixel within block...
63.         if((img.pixels[i++] & 1) == 0) sum |= b; // If black pixel, set bit
64.       }
65.       println("0x" + hex(sum,2)); // Write accumulated bits
66.       myPort.write("0x" + hex(sum,2)); // Write accumulated bits
67.       //if(++n < totalBytes) output.print(',');
68.     }
69.   }
70.   
71.   myPort.write(0x8F);  //end byte
72.   
73. // End array, close file, exit program
74. //  output.println();
75. //  output.println("};");
76. //  output.println();
77. //  output.println("#endif // _" + basename + "_h_");
78. //  output.flush();
79. //  output.close();
80.   println("Done!");
81.   exit();
82. }

2.       myPort.write("0x" + hex(sum,2)); // Write accumulated bits

This line shows up as a random pattern on the display and not what I need, however printing this serially - it looks like the correct format. I think the byte is being converted to an int when I add the 0x to it so I've tried to add the 0x in various ways and convert it to a byte after this, but without any luck. 

Anyone got any ideas? 

Does anyone have advice for how to use twitter 4J and access the XML core functionality in the same sketch? 

I'm using processing 2.0b8 and I have the small block of code below working in a separate sketch that pulls in and parses a BBC xml weather feed but as soon as I add these lines to a sketch that also pulls in searches twitters API for images I get a "The type XML is ambiguous" error. The twitter sketch is based on this one  https://github.com/neufuture/SimpleTwitterStream/ and  anywhere I put the XML block below it makes the type ambiguous. 

2. 
   
3. XML feed = loadXML("http://open.live.bbc.co.uk/weather/feeds/en/2644210/observations.rss");
4. String obs = feed.getChild("channel/item/description").getContent();
5. String when = feed.getChild("channel/item/pubDate").getContent();
6. String[] da= match(obs, "Temperature: ([\\d]*)°C \\([\\d]*°F\\), Wind Direction: ([\\w ]*), Wind Speed: ([\\d]*)mph, Humidity: ([\\d]*)%, Pressure: ([\\d]*mb, [\\w ]*)");
7. 
   
8. print("  "); 
9. println(da[0]); 

Modified twitter image search with Oauth credentials below: Also has some twitter 4j files in the code folder of the sketch - as per the github example link above. 

2. /*
3. SimpleTwitterStreaming
4.  Developed by: Michael Zick Doherty
5.  2011-10-18
6.  http://neufuture.com
7.  
8.  
9.  */
10. 
    
11. ///////////////////////////// Config your setup here! ////////////////////////////
12. 
    
13. // This is where you enter your Oauth info
14. static String OAuthConsumerKey = "";
15. static String OAuthConsumerSecret = "";
16. // This is where you enter your Access Token info
17. static String AccessToken = "";
18. static String AccessTokenSecret = "";
19. 
    
20. // if you enter keywords here it will filter, otherwise it will sample
21. String keywords[] = {"hello"
22. };
23. 
    
24. ///////////////////////////// End Variable Config ////////////////////////////
25. 
    
26. TwitterStream twitter = new TwitterStreamFactory().getInstance();
27. PImage img;
28. boolean imageLoaded;
29. 
    
30. void setup() {
31.   size(800, 600);
32.   noStroke();
33.   imageMode(CENTER);
34. 
    
35.   connectTwitter();
36.   twitter.addListener(listener);
37.   if (keywords.length==0) twitter.sample();
38.   else twitter.filter(new FilterQuery().track(keywords));
39. }
40. 
    
41. void draw() {
42.   background(0);
43.   if (imageLoaded) image(img, width/2, height/2);
44.   
45.         XML feed = loadXML("http://open.live.bbc.co.uk/weather/feeds/en/2644210/observations.rss");
46.         String obs = feed.getChild("channel/item/description").getContent();
47.         String[] da= match(obs, "Temperature: ([\\d]*)°C \\([\\d]*°F\\), Wind Direction: ([\\w ]*), Wind Speed: ([\\d]*)mph, Humidity: ([\\d]*)%, Pressure: ([\\d]*mb, [\\w ]*)");
48.         println(da[0]); 
49. 
    
50. }
51. 
    
52. // Initial connection
53. void connectTwitter() {
54.   twitter.setOAuthConsumer(OAuthConsumerKey, OAuthConsumerSecret);
55.   AccessToken accessToken = loadAccessToken();
56.   twitter.setOAuthAccessToken(accessToken);
57. }
58. 
    
59. // Loading up the access token
60. private static AccessToken loadAccessToken() {
61.   return new AccessToken(AccessToken, AccessTokenSecret);
62. }
63. 
    
64. // This listens for new tweet
65. StatusListener listener = new StatusListener() {
66.   public void onStatus(Status status) {
67. 
    
68.     //println("@" + status.getUser().getScreenName() + " - " + status.getText());
69. 
    
70.     String imgUrl = null;
71.     String imgPage = null;
72. 
    
73.     // Checks for images posted using twitter API
74. 
    
75.     if (status.getMediaEntities() != null) {
76.       imgUrl= status.getMediaEntities()[0].getMediaURL().toString();
77.     }
78.     // Checks for images posted using other APIs
79. 
    
80.     else {
81.       if (status.getURLEntities().length > 0) {
82.         if (status.getURLEntities()[0].getExpandedURL() != null) {
83.           imgPage = status.getURLEntities()[0].getExpandedURL().toString();
84.         }
85.         else {
86.           if (status.getURLEntities()[0].getDisplayURL() != null) {
87.             imgPage = status.getURLEntities()[0].getDisplayURL().toString();
88.           }
89.         }
90.       }
91. 
    
92.  //     if (imgPage != null) imgUrl  = parseTwitterImg(imgPage);
93.     }
94. 
    
95.     if (imgUrl != null) {
96. 
    
97.       println("found image: " + imgUrl);
98. 
    
99.       // hacks to make image load correctly
100. 
     
101.       if (imgUrl.startsWith("//")){
102.         println("s3 weirdness");
103.         imgUrl = "http:" + imgUrl;
104.       }
105.       if (!imgUrl.endsWith(".jpg")) {
106.         byte[] imgBytes = loadBytes(imgUrl);
107.         saveBytes("tempImage.jpg", imgBytes);
108.         imgUrl = "tempImage.jpg";
109.       }
110. 
     
111.       println("loading " + imgUrl);
112.       img = loadImage(imgUrl);
113.       imageLoaded = true;
114.     }
115.   }
116. 
     
117.   public void onDeletionNotice(StatusDeletionNotice statusDeletionNotice) {
118.     //System.out.println("Got a status deletion notice id:" + statusDeletionNotice.getStatusId());
119.   }
120.   public void onTrackLimitationNotice(int numberOfLimitedStatuses) {
121.     //  System.out.println("Got track limitation notice:" + numberOfLimitedStatuses);
122.   }
123.   public void onScrubGeo(long userId, long upToStatusId) {
124.     System.out.println("Got scrub_geo event userId:" + userId + " upToStatusId:" + upToStatusId);
125.   }
126. 
     
127.   public void onException(Exception ex) {
128.     ex.printStackTrace();
129.   }
130. };
131. 
     
132. 
     

I'm new to processing and have had some success so far stumbling around but I'm at a point now where I am unsure how to proceed. 

I'm trying to count the difference in followers on a twitter profile, ideally to query the number regularly and each time there is a new follower I want to move a servo 1 step with firmata and an arduino uno. 

I can access the data from twitters API and display a bundle of follower user ID's (8 digit numbers) in the console box using the println command however I can't work out how to count the total number and display it as an int or something useful that I can create motor outputs from. 

This is my attempt: if anyone has worked on similar problems or has suggestions for things to try I would very much appreciate comments and feedback.