rgb_humaneye.ino

/*
 * LedBrightness sketch
 * controls the brightness of LEDs on "analog" (PWM) output ports.
 */
#include <LiquidCrystal.h>
LiquidCrystal lcd(12,11,9,4,8,7);
class rgb_color {

  private:
    int my_r;
    int my_g;
    int my_b;
  public:
    rgb_color (int red, int green, int blue)
      :
        my_r(red),
        my_g(green),
        my_b(blue)
    {
    }

    int r() const {return my_r;}
    int b() const {return my_b;}
    int g() const {return my_g;}
};

/*instances of fader can fade between two colors*/
class fader {

  private:
    int r_pin;
    int g_pin;
    int b_pin;

  public:
    /* construct the fader for the pins to manipulate.
     * make sure these are pins that support Pulse
     * width modulation (PWM), these are the digital pins
     * denoted with a tilde(~) common are ~3, ~5, ~6, ~9, ~10 
     * and ~11 but check this on your type of arduino. 
     */ 
    fader( int red_pin, int green_pin, int blue_pin)
      :
        r_pin(red_pin),
        g_pin(green_pin),
        b_pin(blue_pin)
    {
    }

    /*fade from rgb_in to rgb_out*/
    void fade( const rgb_color& in,
               const rgb_color& out,
               unsigned n_steps = 256,  //default take 256 steps
               unsigned time    = 25)   //wait 10 ms per step
    {
      int red_diff   = out.r() - in.r();
      int green_diff = out.g() - in.g();
      int blue_diff  = out.b() - in.b();
      for ( unsigned i = 0; i < n_steps; ++i){
        /* output is the color that is actually written to the pins
         * and output nicely fades from in to out.
         */
        rgb_color output ( in.r() + i * red_diff / n_steps,
                           in.g() + i * green_diff / n_steps,
                           in.b() + i * blue_diff/ n_steps);
        /*put the analog pins to the proper output.*/
        analogWrite( r_pin, output.r() );
        analogWrite( g_pin, output.g() );
        analogWrite( b_pin, output.b() );
        if(output.r() == 255 && output.g() == 0 && output.b() == 0){
          delay(time*50);
        }else{
        delay(time);
        }
      }
    }

};

void setup()
{
  lcd.begin(16,2);
  lcd.print("RGB");
  //pins driven by analogWrite do not need to be declared as outputs
}

void loop()
{
  lcd.setCursor(0,1);
  
  fader f (3, 5, 6); 
  /*colors*/
//  rgb_color yellow( 250, 105,   0 );
//  rgb_color orange( 250,  40,   0 );
//  rgb_color red   ( 255,   0,   0 );
//  rgb_color blue  (  10,  10, 255 );
//  rgb_color pink  ( 255,   0, 100 );
//  rgb_color purple( 200,   0, 255 );
//  rgb_color green (   0, 255,   0 );
//  rgb_color white ( 255, 255, 255 );
  lcd.print("yellow");
  rgb_color yellow( 255, 255,   0 );
  lcd.print("red");
  rgb_color red   ( 255,   0,   0 );
  lcd.print("blue");
  rgb_color blue  (  0,  0, 255 );
  lcd.print("teal");
  rgb_color teal  ( 0,  255, 255 );
  lcd.print("purple");
  rgb_color purple( 255,   0, 255 );
  lcd.print("green");
  rgb_color green (   0, 255,   0 );
  

  /*fade colors*/
  f.fade( red, yellow);
  f.fade( yellow, green);
  f.fade( green, teal);
  f.fade( teal, blue);
  f.fade( blue, purple);
  f.fade( purple, red);

//  f.fade( white, yellow);
//  f.fade( yellow, orange);
//  f.fade( orange, red);
//  f.fade( red, blue);
//  f.fade( blue, pink);
//  f.fade( pink, purple);
//  f.fade( purple, green);
//  f.fade( green, white);
  
}