int redPin = 9; 
int bluePin = 10; 
int greenPin = 11; 
int redIn = 0; 
int greenIn = 1; 
int blueIn = 2; 
int redVal; 
int greenVal; 
int blueVal; 
void setup() { 
redVal = 255; 
greenVal = 255; 
blueVal = 255; 
update(); 
} 
// This function updates the LED outputs. 
void update() { 
analogWrite(redPin, redVal); 
analogWrite(greenPin, greenVal); 
analogWrite(bluePin, blueVal); 
} 
// This function updates one of the color variables 
// either getting brighter or getting dimmer. 
// It also updates the outputs and delays for 10 milliseconds. 
void color_morph(int* value, int get_brighter) { 
for (int i = 0; i < 255; i++) 
{ 
if (get_brighter) (*value)--; 
else (*value)++; 
update(); 
delay(10); 
} 
} 
void loop() { 
// start out at black (all off) 
color_morph(&redVal, 1); 
// transition to red 
color_morph(&greenVal, 1); 
// transition to yellow 
color_morph(&redVal, 0); 
// transition to green 
color_morph(&blueVal, 1); 
// transition to aqua 
color_morph(&redVal, 1); 
// transition to white 
color_morph(&greenVal, 0); 
// transition to violet 
color_morph(&redVal, 0); 
// transition to blue 
color_morph(&blueVal, 0); 
// transition to black (all off) 
}