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

/*
 * Dimmer
 * by David A. Mellis
 *
 * Demonstrates the sending data from the computer to the Arduino board,
 * in this case to control the brightness of an LED.  The data is sent
 * in individual bytes, each of which ranges from 0 to 255.  Arduino
 * reads these bytes and uses them to set the brightness of the LED.
 *
 * http://www.arduino.cc/en/Tutorial/Dimmer
 */
 
int ledPin = 9;

void setup()
{
  // begin the serial communication
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
}

void loop()
{
  byte val;
  
  // check if data has been sent from the computer
  if (Serial.available()) {
    // read the most recent byte (which will be from 0 to 255)
    val = Serial.read();
    // set the brightness of the LED
    analogWrite(ledPin, val);
  }
}

/* Processing code for this example
// Dimmer - sends bytes over a serial port
// by David A. Mellis

import processing.serial.*;

Serial port;

void setup()
{
  size(256, 150);
  
  println("Available serial ports:");
  println(Serial.list());
  
  // Uses the first port in this list (number 0).  Change this to
  // select the port corresponding to your Arduino board.  The last
  // parameter (e.g. 9600) is the speed of the communication.  It
  // has to correspond to the value passed to Serial.begin() in your
  // Arduino sketch.
  port = new Serial(this, Serial.list()[0], 9600);  
  
  // If you know the name of the port used by the Arduino board, you
  // can specify it directly like this.
  //port = new Serial(this, "COM1", 9600);
}

void draw()
{
  // draw a gradient from black to white
  for (int i = 0; i < 256; i++) {
    stroke(i);
    line(i, 0, i, 150);
  }
  
  // write the current X-position of the mouse to the serial port as
  // a single byte
  port.write(mouseX);
}
*/

/* Max/MSP patch for this example

max v2;
#N vpatcher 10 59 610 459;
#P user uslider 286 66 18 128 255 1 0 0;
#P window setfont "Sans Serif" 9.;
#P window linecount 1;
#P message 212 192 32 196617 print;
#P newex 286 217 71 196617 serial a 9600;
#P window linecount 2;
#P comment 316 148 100 196617 Slide the fader to dim the LED;
#P comment 69 192 125 196617 Click here to get a list of serial ports;
#P fasten 4 0 2 0 291 215 291 215;
#P fasten 3 0 2 0 217 212 291 212;
#P pop;
*/