int lGreen = 11;
int lRed = 10;
int lBlue = 9;

void setup() {
  pinMode(lGreen, OUTPUT);
  pinMode(lRed, OUTPUT);
  pinMode(lBlue, OUTPUT);
}

void loop() {
analogWrite(lGreen, 0);
analogWrite(lRed, 255);
analogWrite(lBlue, 0);
delay(500);
analogWrite(lGreen, 0);
analogWrite(lRed, 0);
analogWrite(lBlue, 255);
delay(500);
analogWrite(lGreen, 255);
analogWrite(lRed, 0);
analogWrite(lBlue, 0);
delay(500);
}