Arduinoでいろいろ始めたい人が知っておいた方がいい、いろいろなこと ref: http://qiita.com/JotaroS/items/65d19e0e54a88c9d2be9

file0.txt

R = \frac{(V_{cc}-V_f)}{I_f}

file1.txt

R = \frac{(V_{cc}-V_f)}{I_f\frac{l_0}{l}}

file2.java

import controlP5.*;
import processing.serial.*;
Serial myPort;
ControlP5 red,green,blue;
int Red = 100;
int Green = 100;
int Blue = 100;

void setup() {

  //change the port name to yours.
  myPort = new Serial(this,"YOUR_PORT_NAME",9600);

  size(600,600);
  setupSliders();
}

void draw() {
  myPort.write(Red);
  myPort.write(Green);
  myPort.write(Blue);
  myPort.write(0);
  background(Red,Green,Blue);
}

void setupSliders(){
  red = new ControlP5(this);
  green = new ControlP5(this);
  blue = new ControlP5(this);
    red.addSlider("Red")
  .setPosition(100,50)
  .setRange(0,255)
  .setSize(150,50);
    green.addSlider("Green")
  .setPosition(100,150)
  .setRange(0,255)
  .setSize(150,50);
    blue.addSlider("Blue")
  .setPosition(100,250)
  .setRange(0,255)
  .setSize(150,50);
}

file2.txt

import controlP5.*;
import processing.serial.*;
Serial myPort;
ControlP5 red,green,blue;
int Red = 100;
int Green = 100;
int Blue = 100;

void setup() {

  //change the port name to yours.
  myPort = new Serial(this,"YOUR_PORT_NAME",9600);

  size(600,600);
  setupSliders();
}

void draw() {
  myPort.write(Red);
  myPort.write(Green);
  myPort.write(Blue);
  myPort.write(0);
  background(Red,Green,Blue);
}

void setupSliders(){
  red = new ControlP5(this);
  green = new ControlP5(this);
  blue = new ControlP5(this);
    red.addSlider("Red")
  .setPosition(100,50)
  .setRange(0,255)
  .setSize(150,50);
    green.addSlider("Green")
  .setPosition(100,150)
  .setRange(0,255)
  .setSize(150,50);
    blue.addSlider("Blue")
  .setPosition(100,250)
  .setRange(0,255)
  .setSize(150,50);
}

file3.cpp

//Pin assignment.
int red = 9;
int green = 10;
int blue = 11;

//PWM brightness 0 to 255
int Red = 0;
int Blue = 0;
int Green = 0;

// the setup routine runs once when you press reset.
void setup() {
  // declare pin 9 to be an output:
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(blue, OUTPUT);
  Serial.begin(9600);
}

// the loop routine runs over and over again forever.
void loop() {

  //if bunch of data sent from Processing is stacked for over 3...
  if(Serial.available()>3){
    Red = Serial.read();
    Green = Serial.read();
    Blue = Serial.read();
    Serial.read();        //the last data is dummy
  }
  //write data
  analogWrite(green, Green);
  analogWrite(red, Red);
  analogWrite(blue,Blue);

}

file3.txt

//Pin assignment.
int red = 9;
int green = 10;
int blue = 11;

//PWM brightness 0 to 255
int Red = 0;
int Blue = 0;
int Green = 0;

// the setup routine runs once when you press reset.
void setup() {
  // declare pin 9 to be an output:
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(blue, OUTPUT);
  Serial.begin(9600);
}

// the loop routine runs over and over again forever.
void loop() {
  //if bunch of data sent from Processing is stacked for over 3...
  if(Serial.available()>3){
    Red = Serial.read();
    Green = Serial.read();
    Blue = Serial.read();
    Serial.read();        //the last data is dummy
  }
  //write data
  analogWrite(green, Green);
  analogWrite(red, Red);
  analogWrite(blue,Blue);

}