/* Sendkeys
 * This is a Processing sketch that reads the keyboard 
 * and sends keypresses out on the serial (as ascii).
 *
 * To have some sort of feedback to tell you the program is live
 * it displays a circle that turns white when you press a key and
 * fades to black if you leave it alone.
 *
 * CC-By Fredrik Bridell (bridell.com) 2007
 */

import processing.serial.*;

Serial serial; 
int baudRate = 9600;
int t; // this stores the time since last key - used for feedback only

void setup(){
  // the graphics is for feedback only, not really important:
  size(100, 100);
  noStroke();
  ellipseMode(CORNER);
  smooth();
  t=0;
  
  // find and set up the serial port: 
  String[] ports = Serial.list();
  // a good guess on my windows PC is that the last port in the list 
  // is the Arduino sitting on USB. 
  serial = new Serial(this, ports[ports.length-1], baudRate);
}

void draw(){
  // this is for visual feedback only - not for the serial stuff
  // fade the circle to black:  
  fill(max(0, t--));
  ellipse(0, 0, width, height);
}

// here's the real thing: just copy whatever you type to the serial port.
void keyReleased(){  
  serial.write(key);  
  t=255; // turn the feedback circle white
}