Arduino/build/shared/dist/examples/Communication/PhysicalPixel/PhysicalPixel.pde

/*
 * Physical Pixel
 * by David A. Mellis
 *
 * An example of using the Arduino board to receive data from the 
 * computer.  In this case, the Arduino boards turns on an LED when
 * it receives the character 'H', and turns off the LED when it
 * receives the character 'L'.
 *
 * The data can be sent from the Arduino serial monitor, or another
 * program like Processing (see code below), Flash (via a serial-net
 * proxy), PD, or Max/MSP.
 *
 * http://www.arduino.cc/en/Tutorial/PhysicalPixel
 */

int outputPin = 13;
int val;

void setup()
{
  Serial.begin(9600);
  pinMode(outputPin, OUTPUT);
}

void loop()
{
  if (Serial.available()) {
    val = Serial.read();
    if (val == 'H') {
      digitalWrite(outputPin, HIGH);
    } 
    if (val == 'L') {
      digitalWrite(outputPin, LOW);
    }
  }
}

/* Processing code for this example

// mouseover serial 
// by BARRAGAN <http://people.interaction-ivrea.it/h.barragan> 
 
// Demonstrates how to send data to the Arduino I/O board, in order to 
// turn ON a light if the mouse is over a rectangle and turn it off 
// if the mouse is not. 
 
// created 13 May 2004 
 
import processing.serial.*; 
 
Serial port; 
 
void setup() 
{ 
  size(200, 200); 
  noStroke(); 
  frameRate(10); 
 
  // List all the available serial ports in the output pane. 
  // You will need to choose the port that the Arduino board is 
  // connected to from this list. The first port in the list is 
  // port #0 and the third port in the list is port #2. 
  println(Serial.list()); 
 
  // Open the port that the Arduino board is connected to (in this case #0) 
  // Make sure to open the port at the same speed Arduino is using (9600bps) 
  port = new Serial(this, Serial.list()[0], 9600); 
} 
 
// function to test if mouse is over square 
boolean mouseOverRect() 
{ 
  return ((mouseX >= 50)&&(mouseX <= 150)&&(mouseY >= 50)&(mouseY <= 150)); 
} 
 
void draw() 
{ 
  background(#222222); 
  if(mouseOverRect())      // if mouse is over square 
  { 
    fill(#BBBBB0);         // change color 
    port.write('H');       // send an 'H' to indicate mouse is over square 
  } else { 
    fill(#666660);         // change color 
    port.write('L');       // send an 'L' otherwise 
  } 
  rect(50, 50, 100, 100);  // draw square 
} 
*/

/* Max/MSP patch for this example. 

max v2;
#N vpatcher 140 160 740 560;
#P window setfont "Sans Serif" 9.;
#P window linecount 1;
#P comment 333 191 100 196617 Converts to integer;
#P window linecount 2;
#P comment 333 127 100 196617 bangs H for on \, L for off;
#P window linecount 1;
#P newex 263 127 41 196617 sel 1 0;
#P toggle 263 54 60 0;
#P message 278 151 14 196617 L;
#P newex 263 191 40 196617 atoi;
#P message 263 151 14 196617 H;
#P message 224 191 32 196617 print;
#P newex 263 217 71 196617 serial a 9600;
#P window linecount 2;
#P comment 333 75 100 196617 Click here to turn on or off the LED;
#P comment 121 191 98 196617 Click to get a list of the serial ports;
#P connect 7 0 8 0;
#P connect 8 0 4 0;
#P fasten 4 0 5 0 268 178 268 178;
#P fasten 6 0 5 0 283 178 268 178;
#P fasten 3 0 2 0 229 212 268 212;
#P fasten 5 0 2 0 268 212 268 212;
#P connect 8 1 6 0;
#P pop;
*/