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+The Twitter Button is Back in Business!
+(Expect updated code soon)
+Note: Twitter changed its authentication system to reject basic http auth...
+This <del>might</del> does work: [[http://www.arduino.cc/playground/Code/TwitterLibrary|http://www.arduino.cc/playground/Code/TwitterLibrary]]
+=====  Summary  =====
+The "Twitter Button" project's goal is to use a big red HAL9000 button to indicate via twitter that a keyholder is present at [[NSL]]
+The project has since been expanded to include an RFID reader to identify keyholders in addition to the button.
+===== Status =====
+**Active Use!**
+The button is up and mounted next to the door!
+Current twitter button status can be viewed on the [[When Are You There?]] page :)
+=====  Objectives  =====
+Completed:
+  *  Light up button while "NSL is open"
+  *  Tweet status
+  *  Status change by button-press
+  *  Read and Identify RFID card
+  *  Status change by RFID read
+  *  Specific status change based on RFID card used
+  *  Twitter session [[no|longer]] expires after 10 min.
+  *  Twitter wont let you "retweet" past posts... (<del>need to make</del> each post [[is|now]] unique)
+In Progress:
+  *  Configure for keyholder RFID cards... So far I have a handful of cards set up, let me know if I've missed you...
+  *  Package into Box
+  *  Sleep
+Current Issues:
+  *  Twitter has a limit on posts per hour... not nice for testing
+  *  Fit everything into the box, need to play more tetris. (I think that everything fits now)
+  *  Make holes in box for power/ethernet/usb/program mode button
+Future Plans:
+  *  Authenticate RFID with a Python app on server.
+=====  Code - Basic Concept  =====
+''
+<code>
+  - include <Ethernet.h>
+byte mac[[]] = { 0xde, 0xad, 0xbe, 0xef, 0xfe, 0xed };
+byte ip[[]] = { 10, 0, 5, 247 };\t\t\t    // this is the ip within my lan
+byte gateway[[]] = { 10, 0, 0, 1 };\t\t\t// neccessary to get access to the internet via your router
+byte subnet[[]] = { 255, 0, 0, 0 };
+byte server[[]] = { 128, 121, 146, 100 };\t\t   // Twitter's ip
+Client client(server, 80);
+void setup()
+{
+<code>
+  Ethernet.begin(mac, ip, gateway, subnet);
+  Serial.begin(9600);
+  delay(1000);
+  Serial.println(`connecting...`);
+  if (client.connect()) {
+    Serial.println(`connected`);
+    client.println(`POST http://twitter.com/statuses/update.json HTTP/1.1`);
+    client.println(`Host: twitter.com`);
+    client.println(`Authorization: Basic XXXXXXXXXXXXX`);// the string of ###s after `Basic` is the base64_encoded Text of username:password of your twitter account</code>
+\t\t\t\t\t\t\t\t\t\t\t\t// you can do the encoding at this site: http://www.functions-online.com/en/base64_encode.html
+<code>
+    client.println(`Content-type: application/x-www-form-urlencoded`);
+    client.println(`Content-length: 28`);\t\t\t\t\t // this is the length of the text `Yahoo, im twittering!`
+    client.println(`Connection: Close`);
+    client.println();
+    client.print(`status=Yahoo, im twittering!`);
+  } else {
+    Serial.println(`connection failed`);
+  }</code>
+}
+void loop()
+{
+<code>
+  if (client.available()) {
+    char c = client.read();
+    Serial.print(c);
+  }
+  if (!client.connected()) {
+    Serial.println();
+    Serial.println(`disconnecting.`);
+    client.stop();
+    for(;;)</code>
+\t;
+<code>
+  }</code>
+}
+</code>
+''
+=====  Contact  =====
+Any inquiries/suggestions should be told/sent/given/yelled to [[Davo]] in person, via the nsl list, or via IRC... :)