arduino-fade-3.ino

#define PIN_BLINK_LED_BLUE 11
#define PIN_BLINK_LED_RED 9
#define PIN_BLINK_LED_GREEN 10

void setup() {
  // put your setup code here, to run once:
  pinMode( PIN_BLINK_LED_BLUE, OUTPUT );
  pinMode( PIN_BLINK_LED_RED, OUTPUT );
  pinMode( PIN_BLINK_LED_GREEN, OUTPUT );
  digitalWrite( PIN_BLINK_LED_BLUE, LOW );
  digitalWrite( PIN_BLINK_LED_RED, HIGH );
  digitalWrite( PIN_BLINK_LED_GREEN, LOW );
}

void lightMe( int led1, int led2 ) {
  for(int i = 0; i < 10; i++) {
    analogWrite( led1, 255 - i * 25 );
    analogWrite( led2, i * 25 );
    delay( 250 );
  }
  digitalWrite( led1, LOW );
  digitalWrite( led2, HIGH );
    delay( 250 );
}

void loop() {
  lightMe( PIN_BLINK_LED_RED, PIN_BLINK_LED_GREEN);
  lightMe( PIN_BLINK_LED_GREEN, PIN_BLINK_LED_BLUE);
  lightMe( PIN_BLINK_LED_BLUE, PIN_BLINK_LED_RED);
}